I have a 2006 Toyota Sienna XLE Limited with 200K miles and received the same P430 code. I knew I had to drive a destination that was 315 miles away. So I planned it so that half way through the trip, the gas tank will be half emptied and then I could pull over and add the gallon of lacquer thinner and then drive the rest of the way to my destination. I made sure that I was driving at least 2500 RPMs for 3+ hrs. When I got to my destination, the check engine light, VSC and TRAC OFF light was still on. So I was bummed that what worked for others didn't work for me. *BUT*.....the next morning, when I started up the car, the check engine light, VSC and TRAC OFF lights were no longer there. So this WORKS! I was so thrilled that I was saved $1200 from having to deal with a possible catalytic converter problem. Thank you for this entry! You saved me! ;)
I’ll give an update if mine does the same (i.e. codes comes back). I’m getting my timing belt replaced this week as well. In any event, these Toyotas are great cars…how many others can say they have a car that still runs well over 200K? I still thank you anyway and yes I know it was Scotty Kilmers idea. I’ve seen other posts about the same problem and they all said the same that the codes cleared once the lacquer thinner was added. I rechecked using the OBD reader and the codes were cleared.
UPDATE: Engine check light and both VSC and TRAC OOF lights came back on yesterday. I used my OBD reader with the same code P0430 but this time I found more info: Faulty O2 sensors for both Bank2 Sensor 1 and Bank2 Sensor 2 as well as Faulty Engine Coolant Temp (ECT) Sensor. Also DTC Guide shows "Damaged or leaking exhaust system , excessively retarded spark timing". I'm not sure if because this all started when I didn't have the gas cap on tightly (hearing the click) and drove for about 180+ miles like this began this saga. I just got the timing belt done last week and that cost me and arm and a leg...wondering how much this new info I got from my OBD reader is going to cost me. I even tried adding another gallon of the lacquer thinner and this time the lights didn't go out despite me driving about 180+ miles with the gas tank half emptied.
@@markyochum9753 You won't believe it but this morning the engine check light and other 2 lights went out and everything is back to normal (for now). I'm thinking the 2nd time I added the gallon of lacquer thinner gave me an additional delay in addressing this problem. I did more research on this problem and the 3 sensors that my OBD reader said I needed to replace is actually a fairly easy repair Only issue is that it may take some muscle strength to remove it since it's been in this car for 16 years and could take an hour or so to try to unscrew the sensor. One of them is in the front and top side of engine (easily accessible), the other one is under the car by the exhaust pipe and the other one is by the coolant (fairly easy to remove by just emptying the coolant first so there's no extra spillage) and then remove engine coolant temperature (ETC) sensor. I think for now I'll just keep adding the lacquer thinner every time the lights comes back on since it gives me some time and it clearly fixes the problem temporarily. I asked the auto mechanic how much it would cost to fix this problem and he quoted me $1100 (after already spending almost $2K last week for the timing belt & oil change). I can't see spending $1100 for what appears to be an easy quick fix. It just kills me that mechanics get away with charging so much for labor when you know it only takes minutes (in some cases) to fix.
The vsc and traction lights do not go off by themselves on these Toyotas. You can use a scan tool or manually connect pins on the obd port. And it will take numerous drive cycles for a cleared p0430 to come back on. Seems too good to be true.
Hi Mark! We have the same van and I have the same problem now and my smog check is next month. Any updates on what you solution you did to your van. Thank you
Mine is still confusing. All 3 lights keep coming on and going off for the last year now. Mechanic says catalytic converter. But why would the lights go out arbitrarily? I just don't want to put anymore money in it. I think it is an exhause leak. Not sure.
Keep us posted I have the same 06 Sienna but I have both p0420 and p0430. Did it come back? It can take a long time as I found out sometimes up to 800 miles.
So far I have driven it 2,500 miles since then and still no codes. Scotty Kilmore video taught me how to do this. I’m glad it worked for me. It did not work for Eric the car guy.
TIMonTWO Yes. At 205,000 miles the same lights popped up. I need to get the codes checked to see what codes it is pulling. Right now I have it in the shop getting a timing belt changed. When I find out what the codes are I will update you guys
Well Danielle here's an update. I'm frustrated too with it. Initially I put lacquer thinner and that worked for a while. I changed out my spark plugs. Then I had my timing belt changed and that work for a while. Then I had an exhaust leak that I fixed which worked for a while. The lights and the codes keep coming on and off and on and off. As I always say I'm not a mechanic I'm just trying to prevent from spending $1,500 on this thing which is what a new catalytic converter will cost. Maybe if I get new catalytic converters as the code shows the check engine lights and codes will stay off.
@Danielle Funk they are solid Van's. Mine has 227,000 miles on it. Engine and transmission still good. Just frustrated. If I would have just changed the catalytic converter in the beginning I would be better off.
@@markyochum9753 mark had the same codes and changed the catalytic converter codes came back for some reason and now there seems to be an exhaust look hmmm
Update on the P0420 code. I needed a timing belt. It was due at 200,000 miles. At 210,000 miles I had my timing belt changed. Just prior to that the catalytic converter codes came on again. After the timing belt was changed, I drove it around for a day and the code went out again. I now have 215000 miles on it and the codes have not come up again.
Hi Mark, thank for the video. I live in Europe and finding it hard to find laquer thinner. Can you recommend something similar or so you know where I can order it to ship to Sweden? Thank you.
@azaanusa my lights went off by themselves, so I guess I'm a liar. For the serious inquiries, my lights eventually came back on so I don't think the laquer thinner is a good long term fix.
I have a 2006 Toyota Sienna XLE Limited with 200K miles and received the same P430 code. I knew I had to drive a destination that was 315 miles away. So I planned it so that half way through the trip, the gas tank will be half emptied and then I could pull over and add the gallon of lacquer thinner and then drive the rest of the way to my destination. I made sure that I was driving at least 2500 RPMs for 3+ hrs. When I got to my destination, the check engine light, VSC and TRAC OFF light was still on. So I was bummed that what worked for others didn't work for me. *BUT*.....the next morning, when I started up the car, the check engine light, VSC and TRAC OFF lights were no longer there. So this WORKS! I was so thrilled that I was saved $1200 from having to deal with a possible catalytic converter problem. Thank you for this entry! You saved me! ;)
Scotty Kilmers idea. Mine still comes on and off at times...mostly stays on. 254,000 miles now.
I’ll give an update if mine does the same (i.e. codes comes back). I’m getting my timing belt replaced this week as well. In any event, these Toyotas are great cars…how many others can say they have a car that still runs well over 200K? I still thank you anyway and yes I know it was Scotty Kilmers idea. I’ve seen other posts about the same problem and they all said the same that the codes cleared once the lacquer thinner was added. I rechecked using the OBD reader and the codes were cleared.
UPDATE: Engine check light and both VSC and TRAC OOF lights came back on yesterday. I used my OBD reader with the same code P0430 but this time I found more info: Faulty O2 sensors for both Bank2 Sensor 1 and Bank2 Sensor 2 as well as Faulty Engine Coolant Temp (ECT) Sensor. Also DTC Guide shows "Damaged or leaking exhaust system , excessively retarded spark timing".
I'm not sure if because this all started when I didn't have the gas cap on tightly (hearing the click) and drove for about 180+ miles like this began this saga.
I just got the timing belt done last week and that cost me and arm and a leg...wondering how much this new info I got from my OBD reader is going to cost me. I even tried adding another gallon of the lacquer thinner and this time the lights didn't go out despite me driving about 180+ miles with the gas tank half emptied.
I've been driving with my sensors going on and off for 50,000 miles. I'll take it to a mechanic when it stops running. 😁
@@markyochum9753 You won't believe it but this morning the engine check light and other 2 lights went out and everything is back to normal (for now). I'm thinking the 2nd time I added the gallon of lacquer thinner gave me an additional delay in addressing this problem.
I did more research on this problem and the 3 sensors that my OBD reader said I needed to replace is actually a fairly easy repair Only issue is that it may take some muscle strength to remove it since it's been in this car for 16 years and could take an hour or so to try to unscrew the sensor. One of them is in the front and top side of engine (easily accessible), the other one is under the car by the exhaust pipe and the other one is by the coolant (fairly easy to remove by just emptying the coolant first so there's no extra spillage) and then remove engine coolant temperature (ETC) sensor.
I think for now I'll just keep adding the lacquer thinner every time the lights comes back on since it gives me some time and it clearly fixes the problem temporarily. I asked the auto mechanic how much it would cost to fix this problem and he quoted me $1100 (after already spending almost $2K last week for the timing belt & oil change). I can't see spending $1100 for what appears to be an easy quick fix. It just kills me that mechanics get away with charging so much for labor when you know it only takes minutes (in some cases) to fix.
THAT FIX FOR A FEW DAYS BUT DRIVING ON THE FREEWAY THE CODE WIIL COME BACK AGAIN ....I DID IT
Hey Mark tanks for the video,
A vaccum leak can be the another reason. Mainly on plastics intakes manifold
The vsc and traction lights do not go off by themselves on these Toyotas. You can use a scan tool or manually connect pins on the obd port. And it will take numerous drive cycles for a cleared p0430 to come back on. Seems too good to be true.
Hi Mark! We have the same van and I have the same problem now and my smog check is next month. Any updates on what you solution you did to your van. Thank you
Mine is still confusing. All 3 lights keep coming on and going off for the last year now. Mechanic says catalytic converter. But why would the lights go out arbitrarily? I just don't want to put anymore money in it. I think it is an exhause leak. Not sure.
Keep us posted I have the same 06 Sienna but I have both p0420 and p0430. Did it come back? It can take a long time as I found out sometimes up to 800 miles.
So far I have driven it 2,500 miles since then and still no codes. Scotty Kilmore video taught me how to do this. I’m glad it worked for me. It did not work for Eric the car guy.
@jjack6896 it only worked for me for about 6 months, then the lights stayed on all the time.
Have the check engine lights come back on since the video?
TIMonTWO Yes. At 205,000 miles the same lights popped up. I need to get the codes checked to see what codes it is pulling. Right now I have it in the shop getting a timing belt changed. When I find out what the codes are I will update you guys
Well Danielle here's an update. I'm frustrated too with it. Initially I put lacquer thinner and that worked for a while. I changed out my spark plugs. Then I had my timing belt changed and that work for a while. Then I had an exhaust leak that I fixed which worked for a while. The lights and the codes keep coming on and off and on and off. As I always say I'm not a mechanic I'm just trying to prevent from spending $1,500 on this thing which is what a new catalytic converter will cost. Maybe if I get new catalytic converters as the code shows the check engine lights and codes will stay off.
@Danielle Funk they are solid Van's. Mine has 227,000 miles on it. Engine and transmission still good. Just frustrated. If I would have just changed the catalytic converter in the beginning I would be better off.
@@markyochum9753
mark had the same codes and changed the catalytic converter codes came back for some reason and now there seems to be an exhaust look hmmm
Did the codes come back ?
Yes. All the mechanics say bad catalytic converter
Did that clear the code for good? Or did it come back on?
Sherry Ann the codes never came back. I ran a 1/2 tank of gas over a 2 day period running the RPM’s at 2500-3000. Crazy but it worked.
Sherry Ann Sherry Ann 1/2 tank of gas with 1 gallon of the lacquer thinner.
@@markyochum9753 Thank you for responding, Mark! One more question. Did you have to clear the codes or did they go off by themself?
Sherry Ann the 3 lights that were on went off by themselves.
Eventually the lights came back on. I don't think this is a good fix long term.
Did you put the thinner on the gas tank ??
Yes
Sorry. IN the gas tank.
LT is not a trim level for the Toyota Sienna or any other Toyota vehicle. It's the LE instead.
I have exactly problem,. I will try
Did you?
@@jrsgarage7211 I don't think this really works for the long term.
any update one what happened?
Update on the P0420 code. I needed a timing belt. It was due at 200,000 miles. At 210,000 miles I had my timing belt changed. Just prior to that the catalytic converter codes came on again. After the timing belt was changed, I drove it around for a day and the code went out again. I now have 215000 miles on it and the codes have not come up again.
My lights eventually came on again. I don't think this is a good long term fix.
Hi Mark, thank for the video. I live in Europe and finding it hard to find laquer thinner. Can you recommend something similar or so you know where I can order it to ship to Sweden? Thank you.
I am a Registered Nurse not a mechanic. I recieved that advice from Scotty Kilmer.
@@markyochum9753 thank you anyway.
I have to same problem
Shit didn't work. I guess it was worth the try. I knew it was too good to be true.
LIAR CODES DO NOT GO OFF ITSELF --- TOO GOOD TO BE TRUE-
They sure do
My code went off by itself.
@azaanusa my lights went off by themselves, so I guess I'm a liar. For the serious inquiries, my lights eventually came back on so I don't think the laquer thinner is a good long term fix.