Had the P0420 code (cat efficiency) and went through two lengths of non-foulers with no luck. However, I determined that my downstream HO2 sensor was aftermarket and had gone bad. Bought a Denso, eliminated the non-fouler, cleared the code and the issue never came back. So, this probably only works if you have an OEM or a Denso HO2 sensor that's working fine. I also checked my LT and ST fuel trims and found out that I had the wrong MAP sensor. Replaced that too and all is good. Yeah, a history of your E would be fun.🙂
@@clintsearcy3252 I have a shop-fabricated catalytic converter made from a "universal" core. It's not new but I do suspect that was part of the problem and the old sensor was like yours; cheap and didn't last long.
I did this on my 2002 Honda CR-V. It worked perfectly. I recall seeing a video that the EPA requires cars manufactured after a certain year to *purposely* include a test to increase pollutants and confirm the downstream O2 sensor reacts appropriately. This test is specifically to detect cars with spark plug fowlers. I'd think that a short spark plug fowler on a borderline cat could still fool the new test.
so i installed it but now still have P0138 error for: showing a lack of oxygen in the exhaust system. , would drilling this defouler out wider bring in more oxygen?
Had the P0420 code (cat efficiency) and went through two lengths of non-foulers with no luck. However, I determined that my downstream HO2 sensor was aftermarket and had gone bad. Bought a Denso, eliminated the non-fouler, cleared the code and the issue never came back. So, this probably only works if you have an OEM or a Denso HO2 sensor that's working fine. I also checked my LT and ST fuel trims and found out that I had the wrong MAP sensor. Replaced that too and all is good. Yeah, a history of your E would be fun.🙂
The downstream O2 sensor I'm currently running is a cheap Rack Auto unit. I can't tell you why some folks have luck with this and some don't.
@@clintsearcy3252 I have a shop-fabricated catalytic converter made from a "universal" core. It's not new but I do suspect that was part of the problem and the old sensor was like yours; cheap and didn't last long.
Thanks for this video! I've ordered 2 others that didn't fit from the d-man company that weren't compatible!
Glad I could help! Yea, I ordered the Dormans once that were too short when they came in.
I did this on my 2002 Honda CR-V. It worked perfectly. I recall seeing a video that the EPA requires cars manufactured after a certain year to *purposely* include a test to increase pollutants and confirm the downstream O2 sensor reacts appropriately. This test is specifically to detect cars with spark plug fowlers. I'd think that a short spark plug fowler on a borderline cat could still fool the new test.
Yea, the good ol EPA. They are always lots of fun.
Good one Clint. Will be interesting to see if it will be confirmed you didn’t need to drill the hole larger. If it makes a difference.? Thanks
That's the plan.
so i installed it but now still have P0138 error for: showing a lack of oxygen in the exhaust system. , would drilling this defouler out wider bring in more oxygen?
It might. I've never had to address the 0138 error.
Worked for me. Had one for a year without a code before I finally replaced my cat.
Good to know.
You are lucky to have an original Cat ! Most of them, including mine are stolen by now.
I'm not sure how lucky I am. I plan to straight pipe it at some point.
On honda I've learned you need to use only Honda oem or Denso sensors . The others will not work
I have also used BOSCH with good results but you can't go wrong with OEM.
For o2 sensors?
I have an 03 I just purchased.. a month ago.. and it has a recurring 0420 code. What is the thread size I need for my o2 sensor?
Link in the description with all the information.
Oops.. just got a notification that that website has a virus... might want to run your antivirus on your phone/computer to clean it off..
What year is your Honda Element?
It's a 2003 but the light blue parts are from a 2006
TL:DR - Yes, yes it can.
Ok