Last post on Jan 06, 2010 at 9:51 AM
You are in the Toyota Sienna
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Toyota Sienna, Van
#8 of 18 Code PO420
Nov 15, 2008 (7:50 pm)
I have a 2002 sienna with 140000 miles on it the check engine light is on and i have a po420 catylist code bank 1. I changed bank 1 sensor bank 2 sensor and sensor at cat all coming from toyota. Then i changed the cat the engine pipe and the front cat connected to the manifold which in turn replaced all the cats. I reset the computer and after the drive cycle the same po420 catalyst code bank 1 returned i'm stumped now.
#9 of 18 Re: Code P1346 Toyota Sienna `01 [veepee1]
Nov 15, 2008 (8:11 pm)
I had the same code and is definately not alligned right when you re- allign it right the code will go away. Sorry to say but it is still out one tooth. Because of the rear pulley position and when you release the tension back on the belt it is difficult to keep everyhting in place.
#10 of 18 My problem never got fixed
Nov 17, 2008 (6:22 am)
Traded in the sienna a year ago. The light never did go out. Took it to a really good
repair place that checked it for emission leaks with smoke. They of course found leaks all over the place. The gas cap area (already replaced the cap once) and the canister leaked as well. They were talking 1500.00 to do the repairs and still would not guarrentee the engine light would go off. So we dumped the van.
Sickens me that these sensors cause so many problems and the repair people are clueless to the answer.
The repair place did say we had the wrong gas cap. But we got it from toyota, in fact the parts place needed our vin number because toyota had about 3 different caps for that year model. I guess the idiot gave us the wrong cap. Would not be supprised if that was the problem.
But the van would stall and got bad gas mileage so it was getting to be too much of a problem. I can live with the gas mileage but stalling was too dangerous.
#11 of 18 Re: Code PO420 [mpokeo]
Dec 02, 2008 (8:08 am)
I know this is way out in left field but I had a strange code and it turned out to be some rodents in the engine bay, chewing up the wiring harness. It reported bad knock sensors, but it was chewed wires!
#12 of 18 2003 Sienna P0440 P0441 P0446
Mar 04, 2009 (4:26 pm)
Need Help - Please!
140,000 miles - car passes emmissions test levels but fails because of these codes and misfire codes. The CEL is on, and from other post, I checked the following:
1) the gas-cap- it whooshes when I open the tank after being parked for 1 hour.
2) removed the canister - it's lightweight and dry, and does not appear to be cracked, but it had heavy gas fumes. Hoses look new and are tight.
3) solenoid valve at canister - tested fine. Connections are good.
4) upper solenoid valve at air filter - tested fine. Connections are good.
5) upper hose at air filter - looks good.
What's next to check? Any advice?
#13 of 18 Re: 2003 Sienna P0440 P0441 P0446 [03sienna]
Mar 08, 2009 (4:12 pm)
Not to scare you but your problem may be engine "oil gel" or sludge related. I also had my check engine light on in my 2000 Sienna for over 2 years and all they ever said was to tighten my gas cap. Now, this past November 2008, my car started to smoke in the mornings when I would first crank it. You need to go to www.oilgelsettlement.com and read it over. Also, there is a petition that other Toyota owners are signing on line. I can't remember the web address but if you google oil gel/sludge petition you will find it. Feel free to write me back if you need any advice. I just noticed that your Sienna is a 2003. Your engine may not have the same problem as the 1 MZ FE that was affected in the settlement. Good Luck!
#14 of 18 Re: 2003 Sienna P0440 P0441 P0446 [mommy2four]
Mar 11, 2009 (7:00 am)
I had 99,500 miles on my 01 sienna. When we kept getting the loose gas cap type engine light, it also started to stall on some occasions. When I brought it in they said it was leaking emmissons at the cap, and 3 other places. They would not guarrentee the $1000.00 repair would fix the problem.
I did not believe they knew what the problem was, because why would it leak all over the place. It should have been only one location. It was apparent they were trying to get me to repair things that did not need repair.
We traded the van in but if it were the oil sludge issue. I would have still been covered under the toyota extended warranty for sludge which is 100k I think. Would have been nice to know this could have been the problem all along.
Now that I think about it I am pretty sure a sludge issue would also have caused stalling. But the van would work fine most of the time. Just have that dumb engine light on.
#15 of 18 Re: 2003 Sienna P0440 P0441 P0446 [gunga64]
Mar 12, 2009 (10:35 am)
The light was basically just reporting an indirect symptom of the sludge issue.
#16 of 18 Help please! 2006 sienna
Jan 05, 2010 (10:06 am)
when were were driving out 2006 Sienna with 35,000 miles on it, home from vacation our "Mait Req" light came on (because it was time for our oil change, nothing to worry about.), then our (-) tire pressure light came on , due to a leek in one tire. As we stopped at the gas station, we put more air in the tire and headed home. the (-) tire pressure light came back on and the three lights jumped on all at once (malfunction indicator lamp) ( VSC) and ( ABS).
When I took the van in to the shop, I told them that I though everything was related and to just do the oil change and we will replace the back tire. If the (malfunction indicator lamp light) does not go off, should I spend the $150 for them to check to see if anythying else is wrong or do you think they are related and wait a while?
I could use some help.
#17 of 18 Re: Help please! 2006 sienna [rebbeller]
Jan 05, 2010 (10:10 am)
Instead of paying $150 why not buy an ODB2 scanner for $99 or so? Then you can use it again next time.
Having said that, the fact that 3 lights went on at the same time imply it may be a problem too complex for a DIYer.