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Although when you consider shop labor costs, most owners are better off replacing all the parts they are able to before paying for a few hours of diagnostic labor. For example, I had an 04 Altima I replaced a crank sensor for $20 myself, my boss's wife has the identical car and the shop charged them over $600. A ball joint failed on my wife's crown vic, towed it to a shop since it was a holiday weekend and I was busy, they charged over $700 for a literal $5 one on rock auto.
@@JesusSaves86AB Exactly. I can buy a ton of parts for $500. Even if I replace 5 wrong parts with the shotgun approach, my vehicle is 24 year old and 168K miles. The 5 "wrong" parts were on their way to failure, anyway -- and tow trucks cost big money these days.
Bingo!!! I've been chasing the cause of the P0401 code on my '03 Focus for almost a year... even threw a new DPFE sensor at it. After watching your video, I pulled the vacuum hose and it looked EXACTLY like the one on your example car in the video... rubbed right through. I repaired the hose with a piece of tubing, and reset the code. Hopefully, it's gone for good now. Thanks for your excellent video and troubleshooting skills!
You are good, professional, knowledgeable, educational the best of the best. THANK YOU very much for taking the time to help and add to the body of knowledge of the internet
This video really is awesome, helped me on my ford ranger, good job explaining it and not just rambeling on like other videos. everything was very useful .
I've viewed many videos regarding identifying a rough idle and egr valves and dpfe sensors, but this one is the very best at how to proceed with workflow on solving the issue. Brilliant tutorial! Thanks!
great job and your way of making it understandable is terrific. I know what you meant BTW about chemistry and inert gases, Thank You so much for the education on the EGR and the associated fixes. A good technician like yourself knows you dont throw parts at a car to make it stick, lol
As usual great video. You are amongst the top 5 professionals who also have the gift of teaching. I volunteer at my church's Car Care Ministry. Because of my experience I do most of the diagnostics. We don't charge anything and if the people don't have money for parts we often pay the parts tab. We have 5 lifts! On any given Car Care Saturday we may have 12-15 cars. All I have are basic diag tools eg multimeter, fuel pressure gauge etc. We do have an OTC Evolve scanner which is a blessing but not up date. I would love a scope. We don't have any subscription service either. I put a lot of pressure on myself being sure not to change parts unnecessarily as we have to be good stewards of our funds. Also it's just crazy to throw parts at a car that doesn't need them. As you know without the proper tools the diagnostics takes much longer and much more difficult. I have cancer so I can't work a regular job but I'm blessed to have the privilege and opportunity to help people and use my skills. I was an ASE certified mechanic but had to leave the trade. I was told I had 6 months to live in 01 but I fought back after spending eight years in bed...sorry for the long story but just wanted you to know how many people you help with your videos. I could never do what I am doing without studying the top You Tube teachers. Just like to add, if anyone would be interested in donating or loaning a scanner or scope or any tools it would be a great help and it would be tax deductible. We were recently on USA today and had 7 million views! Many people donated cars which we fix up and give away. We donated 27 cars last year. There is always a need for Diagnostics. Thank you very much
Brandon Corona Thank you very much Brandon! Even though I have been fighting cancer for decades, I still feel blessed. I have four great kids, a beautiful wife who stood by me while I was bedridden for about 8 years. People like yourself who offer kind thoughts help keep me going. Take care
Joe, I hope you're still working on things. May I suggest you start a youtube channel of your repairs. It could make the organization some much needed money to continue your great service. Also, you can link a patreon account for donations.
I had a similar problem I changed egr valve dpfe and vacuum solenoid afetr all this i had coneccted the hoses from the dpfe wrong after correcting my error the light went off, but i did had a bad dpfe and solenoid i hope this helps. I am not a professional I am doit yourselfer. but learned thanks to guys like this. I had a 94 explorer xlt.
Excellent video. I bet he has so much work that he has to turn customers away because he just cannot get to everybody in a timely manner. I think its called "highly skilled and a high degree of integrity"!
Excellent video. My 97 Firebird Formula LT1 had this problem. I tested and all seemed ok. On this engine the computer looks at the Manifold Absolute Pressure sensor for a 1 kilopascal pressure drop when the EGR is activated. On a hunch I removed the MAP sensor and cleaned the manifold port under it with spray carb cleaner with and without the engine running. Until I did this the flow code always came back. Cleared the code and happily it has not returned. EGR flow problems can be a challenge.
Thank you very much for the video and information, I've been try to fix this for a while but this may be what's causing my issue and just the info I needed thanks
Ok I had a Code P0403 pop up when I got my 08 Ford Focus looked at at the local Autoparts shop. Seems to be similar to P0401. I'll be checking mine this weekend thank you so much for the great video!
Same thing happened with our 03' Ford Focus. Would stall out at stop. Rubbed through on vacuum line. May be a common problem with this car versus buying a new egr valve. It can be that simple of a fix. Thank you for your video!
Nice presentation. logical explanations. Good simple background information on fault. Clear well lit video. Easy to listen to and follow. Thanks for your good work.
as a former tech, thats been awayu a while, thanks for the info on how to diagnose this problem. I have been studiously ignoring the wifes toyota for the last month with this code for lack of understanding of how easy it could be to diagnose. thanks cant see the forest for the trees
Great explanation, Duane. I guess I would have started with the hoses, as access to computer diagnostics beyond OBDII is not avail to a backyard mechanic. You make a great point that the pro needs to stay with basics, as the temptation would be to throw parts and see if the problem is fixed. That way would have eventually led to the solution, but only after the customer might have paid for replacement of normal devices.
excellent video amazing these are available. I just want to chime in that sometimes they are quick to say "do proper tests--don't just throw parts" but the truth is when you go in you sign your life away on a big contract and it can be a couple thousand to get the vehicle back. The only people that can do true testing are highly skilled and using expensive equipment. a few minutes of their time and for a fact you are already up into the hundreds. now to avoid losing those hundreds---you have to sign your life away hoping it fixes it. That's just the facts of life.
Thank you, I am a mechanic that love fix and just replace if I don't have another option. I have the same problem with a 1997 Ford Windstar 3.0. I will post what I found. Blesses!
This is a great learning tool video. Easy to understand, good explanations, lighting... etc. I'm a DIY mechanics for the easy stuff, but this video will help me a whole lot in understanding of how to fix P0401 EGR Check Engine on my 97 Ford Expedition. Good job guys. Keep it up and good luck with all your endeavors.
Sir: my 2001 Expedition has the check engine light on, same code, insufficient flow. Will it hurt the car if I wait for warmer weather to track down the problem?
hi I have to tell you first you are thee best I have seen! I have a problem and changed the EGR valve and the O2 sensor still have the check engine light on and code is p401 101 have to get this car to pass NYS vehicle inspection this month please help me to check where I go to get such a mechanic like you !!
If you have vacuum at the EGR valve at idle, replace the TPS. It's causing the idle to increase some causing vacuum to be sent to the EGR. It can cause EGR position sensor codes.
Great video but what is the part number to the vacuum hose from egr solenoid to the intake manifold that you changed? mine was the same on my daughters 2004 Ford Focus and again great video
If you dont have a fancy scantool you can disconnect both DPFE hoses, and draw a bit of vacuum on the DPFE (maybe 5 Hg or so)and monitor its voltage using a multimeter or scantool. If there isn't a linear relationship(voltage jumps around) the DPFE is implicated. Remember the DPFE is measuring the difference in pressure between the two ports.
hi, i had 2002 ford expedition v8 5.4 L i was wondering how to hook or install the egr valve feedback sensor? i'm forgot to mark those hose when i pulled the hose. at the sensor said ref connector and hi connector, thank you
i have a 2000 ford f150 and i have the same code. I changed the egr valve but still have the service engine soon light on. the mechanic wants to charge me $160 to clean the system because he feels i have a blockage. He mentioned a sensor but I don't know what he meant . Would like some feed back
I got a Ford Tempo GL 3L V6 and I just changed he EGR valve and still the code pops up insufficient EGR valve flow...Do you think I mismatched the hoses? the is one hose,,, I am not sure where it goes...
I have some codes on my 1999 cougar v6, and I'm getting the p171 and p174 codes, and after tune up and intake gaskets i have narrowed done to egr system fault. I hope these tests help. Any suggestions? Also failed smog because of high nox...
I have a code P0402 on my Miata Excessive recirculation gas detected. Would it cause the engine to run rough or stall? My car runs fine with the cel on.Bad signal maybe? Any opinion
@jimmy101112000 the exhaust if you hear loud exhaust noise that pipe is clear. If its plugged it will usually be full of hard carbon. You should be able to squirt some ATF fluid into the EGR port to clean and break down the carbon which takes some time to soak if you can't get the carb cleaner to work. I recommend a a stiff flexable wire to help unclog it. I had to do this on a GM 3100 engine and its port was clogged with rock hard carbon. Carb cleaner and 20 mins of poking and spraying.
@mrfordexplorer97 Sounds like you got a plugged port. To check there is two ways. One is to pull the vacuum line and apply vacuum to the EGR while the engine is running. If it stalls the port is clear. If it does not stall the port is plugged. Or you can remove the valve and plug the vacuum line start the engine to see if you got great suction on the intake side of the EGR if you don't the port is plugged. Use some Carb cleaner and a stiff wire to clean it. The other pipe runs to
I did a vacuum leak check on my 2001 ford ranger 3.0L v6 with smoke and I ended up getting three leaks one was the egr valve the other was the iac valve the last one was a small hoes. I took off the egr valve and the diaphragm was holding vacuum but it was very crusty with a lot of carbon. so, my question is why was there smoke coming from underneath the diaphragm housing any ideas?
Nice video. My connector to the DPFE sensor broke and I had to replace it but I am not sure if I spliced the wires back correctly. I know the middle is the ground but the red wire and brown wire not sure of the pin location. Any help would be appreciated. Also the new plug wiring is not numbered or color coded. Ken.
Hi realfixesrealfast I have a UK specification Ford Focus with 1.6 DOHC duratec engine I have just replaced the HT leads and spark plugs to eliminate a misfire issue which has been resolved but there is a seperate intermittant issue Upon starting from cold fair infrequently the revs will jump up and down at a rate of about 3 times a second and will jump at a gap of about 300 revolutions per minute in a chugging fashion once the engine has warmed a little the issue goes away what could it be
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Folks, That is a Real mechanic. Great job troubleshooting the problem and not being a professional parts changer.
Although when you consider shop labor costs, most owners are better off replacing all the parts they are able to before paying for a few hours of diagnostic labor.
For example, I had an 04 Altima I replaced a crank sensor for $20 myself, my boss's wife has the identical car and the shop charged them over $600.
A ball joint failed on my wife's crown vic, towed it to a shop since it was a holiday weekend and I was busy, they charged over $700 for a literal $5 one on rock auto.
@@JesusSaves86AB Exactly. I can buy a ton of parts for $500. Even if I replace 5 wrong parts with the shotgun approach, my vehicle is 24 year old and 168K miles. The 5 "wrong" parts were on their way to failure, anyway -- and tow trucks cost big money these days.
I think this's the best explanation I've ever heard about how to test a Ford DPFE EGR system.
Never seen anyone explain things so understandably before on TH-cam! Thanks
Incredible. Watched a minute and twelve seconds of this video and wanted to go have a beer with this man.
Bingo!!! I've been chasing the cause of the P0401 code on my '03 Focus for almost a year... even threw a new DPFE sensor at it. After watching your video, I pulled the vacuum hose and it looked EXACTLY like the one on your example car in the video... rubbed right through. I repaired the hose with a piece of tubing, and reset the code. Hopefully, it's gone for good now. Thanks for your excellent video and troubleshooting skills!
This is a fantastic find!! Nice to have a mechanic that explains the problem in easy to follow instructions!
Thank you!
You are good, professional, knowledgeable, educational the best of the best. THANK YOU very much for taking the time to help and add to the body of knowledge of the internet
An excellent test, an excellent intelligent mechanic who explains things in a simple clear way. Thanks
This video really is awesome, helped me on my ford ranger, good job explaining it and not just rambeling on like other videos. everything was very useful
.
Best explanation of P0401 I have seen. Thanks Chief!
You produce the best videos on TH-cam - thanks!
you gotta love this guy! he breaks it all down so you can digest it.
I've viewed many videos regarding identifying a rough idle and egr valves and dpfe sensors, but this one is the very best at how to proceed with workflow on solving the issue. Brilliant tutorial! Thanks!
Thank you Ricky, glad it was helpful. I appreciate you taking the time to comment.
Your Videos are second to none. Thanks for posting.
great job and your way of making it understandable is terrific. I know what you meant BTW about chemistry and inert gases, Thank You so much for the education on the EGR and the associated fixes. A good technician like yourself knows you dont throw parts at a car to make it stick, lol
A real mechanic and great job on the video. Hell if I lived close to you I would quite working on my car and bring it to you. Good Job
As usual great video. You are amongst the top 5 professionals who also have the gift of teaching. I volunteer at my church's Car Care Ministry. Because of my experience I do most of the diagnostics. We don't charge anything and if the people don't have money for parts we often pay the parts tab. We have 5 lifts! On any given Car Care Saturday we may have 12-15 cars. All I have are basic diag tools eg multimeter, fuel pressure gauge etc. We do have an OTC Evolve scanner which is a blessing but not up date. I would love a scope. We don't have any subscription service either. I put a lot of pressure on myself being sure not to change parts unnecessarily as we have to be good stewards of our funds. Also it's just crazy to throw parts at a car that doesn't need them. As you know without the proper tools the diagnostics takes much longer and much more difficult. I have cancer so I can't work a regular job but I'm blessed to have the privilege and opportunity to help people and use my skills. I was an ASE certified mechanic but had to leave the trade. I was told I had 6 months to live in 01 but I fought back after spending eight years in bed...sorry for the long story but just wanted you to know how many people you help with your videos. I could never do what I am doing without studying the top You Tube teachers. Just like to add, if anyone would be interested in donating or loaning a scanner or scope or any tools it would be a great help and it would be tax deductible. We were recently on USA today and had 7 million views! Many people donated cars which we fix up and give away. We donated 27 cars last year. There is always a need for Diagnostics.
Thank you very much
Joe Mikos May God bless you.
Brandon Corona Thank you very much Brandon! Even though I have been fighting cancer for decades, I still feel blessed.
I have four great kids, a beautiful wife who stood by me while I was bedridden for about 8 years. People like yourself who offer kind thoughts help keep me going.
Take care
Joe, I hope you're still working on things.
May I suggest you start a youtube channel of your repairs. It could make the organization some much needed money to continue your great service. Also, you can link a patreon account for donations.
Would your organization help me?
that is awesome.....
Thank you so much for your video. I had such a headache wife daughters car, and your video showed me what was wrong. Cheers.
That's very instructive.
The great thing in your videos is the intellectual journey from the problem to the fix .
Cool.
I had a similar problem I changed egr valve dpfe and vacuum solenoid afetr all this i had coneccted the hoses from the dpfe wrong after correcting my error the light went off, but i did had a bad dpfe and solenoid i hope this helps. I am not a professional I am doit yourselfer. but learned thanks to guys like this. I had a 94 explorer xlt.
Excellent video. I bet he has so much work that he has to turn customers away because he just cannot get to everybody in a timely manner. I think its called "highly skilled and a high degree of integrity"!
Excellent! thank you for sharing your knowledge.
Excellent work, clear, precise and accurate. Thanks.
Excellent video. My 97 Firebird Formula LT1 had this problem. I tested and all seemed ok. On this engine the computer looks at the Manifold Absolute Pressure sensor for a 1 kilopascal pressure drop when the EGR is activated. On a hunch I removed the MAP sensor and cleaned the manifold port under it with spray carb cleaner with and without the engine running. Until I did this the flow code always came back. Cleared the code and happily it has not returned. EGR flow problems can be a challenge.
I enjoy your work im always learning 30 years into it
Thank you very much for the video and information, I've been try to fix this for a while but this may be what's causing my issue and just the info I needed thanks
Ok I had a Code P0403 pop up when I got my 08 Ford Focus looked at at the local Autoparts shop. Seems to be similar to P0401. I'll be checking mine this weekend thank you so much for the great video!
Same thing happened with our 03' Ford Focus. Would stall out at stop. Rubbed through on vacuum line. May be a common problem with this car versus buying a new egr valve. It can be that simple of a fix. Thank you for your video!
Nice presentation. logical explanations. Good simple background information on fault. Clear well lit video. Easy to listen to and follow.
Thanks for your good work.
as a former tech, thats been awayu a while, thanks for the info on how to diagnose this problem. I have been studiously ignoring the wifes toyota for the last month with this code
for lack of understanding of how easy it could be to diagnose.
thanks
cant see the forest for the trees
Clear, specific knowledge, thank you!
Thank you so much for educating me. It helped me understand what's going on.
Good video, going to start working at a new shop with possibly more diag in my future as a tech. Thanks for the before and after on the dpfe pid.
Great explanation, Duane. I guess I would have started with the hoses, as access to computer diagnostics beyond OBDII is not avail to a backyard mechanic.
You make a great point that the pro needs to stay with basics, as the temptation would be to throw parts and see if the problem is fixed. That way would have eventually led to the solution, but only after the customer might have paid for replacement of normal devices.
Real world problems real world solutions. That's why I watch this channel.
excellent video amazing these are available. I just want to chime in that sometimes they are quick to say "do proper tests--don't just throw parts" but the truth is when you go in you sign your life away on a big contract and it can be a couple thousand to get the vehicle back. The only people that can do true testing are highly skilled and using expensive equipment. a few minutes of their time and for a fact you are already up into the hundreds. now to avoid losing those hundreds---you have to sign your life away hoping it fixes it. That's just the facts of life.
Thanks a lot for this instructive video. I'm not good in mecanics and this helps me understand some new stuff about EGR and troubleshooting :D
Love your videos! I think I have watched ALL of 'em!
i like this kind of explanation , it is very clear and understandable i really enjoy to see these videos. they are very helpful.thanks.
Thank you, I am a mechanic that love fix and just replace if I don't have another option. I have the same problem with a 1997 Ford Windstar 3.0. I will post what I found. Blesses!
You taught me exactly what I like to know.
Excellent explanation of EGR flow. WOW
Cool video. Your explanations are great as always.
great info about EGR system really clear thank you..
Another great video! Thank you so much!
This is a great learning tool video. Easy to understand, good explanations, lighting... etc. I'm a DIY mechanics for the easy stuff, but this video will help me a whole lot in understanding of how to fix P0401 EGR Check Engine on my 97 Ford Expedition. Good job guys. Keep it up and good luck with all your endeavors.
Nice job of explaining, Man.
Great video! Thanks for sharing.
How do vehicles without a DPFE monitor the exhaust to know the EGR valve is working? I have an ML320 diesel with similar issue but no DPFE
Excellent video. very well explained
Extremely helpful, thank you so much
Excellent explanation. Thanks!
Great video! Thank you!
Top notch Sir. Very helpful.
Best explanation i've seen. I wonder if that car also had a high idle when it was cold.
Awesome vid! Thanks!
Sir: my 2001 Expedition has the check engine light on, same code, insufficient flow. Will it hurt the car if I wait for warmer weather to track down the problem?
Thank you very much, it was very informative and clear.
very clear, concise explanation!
Thanks for the tips and help
it great information...Thank you.
hi
I have to tell you first you are thee best I have seen! I have a problem and changed the EGR valve and the O2 sensor still have the check engine light on and code is p401 101 have to get this car to pass NYS vehicle inspection this month please help me to check where I go to get such a mechanic like you !!
Great job! thank you
A pro presentation!
Wow. Best video ever
If you have vacuum at the EGR valve at idle, replace the TPS. It's causing the idle to increase some causing vacuum to be sent to the EGR. It can cause EGR position sensor codes.
I have the same code for my toyota camry thats good info...Now I'm going to check it out. Because the EGR valve for my car cost $150...DAMN!!! =(
Great video but what is the part number to the vacuum hose from egr solenoid to the intake manifold that you changed? mine was the same on my daughters 2004 Ford Focus and again great video
If you dont have a fancy scantool you can disconnect both DPFE hoses, and draw a bit of vacuum on the DPFE (maybe 5 Hg or so)and monitor its voltage using a multimeter or scantool. If there isn't a linear relationship(voltage jumps around) the DPFE is implicated. Remember the DPFE is measuring the difference in pressure between the two ports.
i am looking for the part numb er for the vacume line he replaced mine bad as well, i cant it any where.
hi, i had 2002 ford expedition v8 5.4 L
i was wondering how to hook or install the egr valve feedback sensor?
i'm forgot to mark those hose when i pulled the hose.
at the sensor said ref connector and hi connector,
thank you
Thank you so much for Sharing this video Sir.
Nice work!
Great video
Excellent video! Thanks
Great machanic thanks for sharing. my problem was a leaking gasket on egr valve.
Glad it helped, thanks for your comments.
i have a 2000 ford f150 and i have the same code. I changed the egr valve but still have the service engine soon light on. the mechanic wants to charge me $160 to clean the system because he feels i have a blockage. He mentioned a sensor but I don't know what he meant . Would like some feed back
Good Stuff!
will a bad egr vacuum regulator cause high idle, when the engine warms up
great diagnostics
I got a Ford Tempo GL 3L V6 and I just changed he EGR valve and still the code pops up insufficient EGR valve flow...Do you think I mismatched the hoses? the is one hose,,, I am not sure where it goes...
great video....thanks....
I have some codes on my 1999 cougar v6, and I'm getting the p171 and p174 codes, and after tune up and intake gaskets i have narrowed done to egr system fault. I hope these tests help. Any suggestions? Also failed smog because of high nox...
thanks for the video keep it up !!!!!!!
I have a code P0402 on my Miata
Excessive recirculation gas detected. Would it cause the engine to run rough or stall? My car runs fine with the cel on.Bad signal maybe? Any opinion
@jimmy101112000 the exhaust if you hear loud exhaust noise that pipe is clear. If its plugged it will usually be full of hard carbon. You should be able to squirt some ATF fluid into the EGR port to clean and break down the carbon which takes some time to soak if you can't get the carb cleaner to work.
I recommend a a stiff flexable wire to help unclog it.
I had to do this on a GM 3100 engine and its port was clogged with rock hard carbon. Carb cleaner and 20 mins of poking and spraying.
I have a ford ranger 2002 and checked the flow and it stumbled, so solenoids working? and DPfe is bad?
so if my dpfe has no hoses on it as the plastic broke that holds the hoses this code would arrive ?
Great video thank you
great illustrator!
@mrfordexplorer97 Sounds like you got a plugged port. To check there is two ways. One is to pull the vacuum line and apply vacuum to the EGR while the engine is running. If it stalls the port is clear.
If it does not stall the port is plugged.
Or you can remove the valve and plug the vacuum line start the engine to see if you got great suction on the intake side of the EGR if you don't the port is plugged. Use some Carb cleaner and a stiff wire to clean it. The other pipe runs to
great video
I did a vacuum leak check on my 2001 ford ranger 3.0L v6 with smoke and I
ended up getting three leaks one was the egr valve the other was the
iac valve the last one was a small hoes. I took off the egr valve and
the diaphragm was holding vacuum but it was very crusty with a lot of
carbon. so, my question is why was there smoke coming from underneath
the diaphragm housing any ideas?
Woo .that what we call master
can I pinch the egr tube closed or use a blanking plate and eliminate the valve altogether?
by replacing egr valve will it stop it by motor vibrating
Nice video. My connector to the DPFE sensor broke and I had to replace it but I am not sure if I spliced the wires back correctly. I know the middle is the ground but the red wire and brown wire not sure of the pin location. Any help would be appreciated. Also the new plug wiring is not numbered or color coded. Ken.
Could the Dpfe cause driveability issues that occur with the p0401 code or would the check engine light be the only symptom of a bad Dpfe?
Hi realfixesrealfast
I have a UK specification Ford Focus with 1.6 DOHC duratec engine
I have just replaced the HT leads and spark plugs to eliminate a misfire issue which has been resolved but there is a seperate intermittant issue
Upon starting from cold fair infrequently the revs will jump up and down at a rate of about 3 times a second and will jump at a gap of about 300 revolutions per minute in a chugging fashion once the engine has warmed a little the issue goes away
what could it be
@crissy7503 in fixed one like that it turned out to be a faulty throttle positioning sensor and the catalytic convertor was plugged