Last post on May 13, 2013 at 11:52 AM
You are in the Toyota Sienna
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Toyota Sienna, Van
#105 of 126 Auto AC trouble codes
Apr 05, 2011 (7:57 am)
The AC on my 2004 Sienna XLE stopped cooling. I ran the on board diagnostic function to display trouble codes for the climate control system. I received code 21. My Haynes Repair manual indicated that a 21 indicates trouble with the "solar sensor circuit". What is the solar sensor circuit? I also received a code 24. Haynes does not list a 24 trouble code. Any ideas on what's going on? Also how do I determine the low side service valve for the AC?
#106 of 126 Re: My 2002 Toyota Sienna won't clear the computer! [honjugo]
May 25, 2011 (7:09 pm)
did yr mechanic check the oxygen and air fuel sensor? my 2004 sienna didn't pass inspection in 2009. i paid $2200 to fix it..... fixed the sliding door $2300 in 2010....they said the steering wheel has problem now.....i'm still thinking should fix it or not, it costs $2500..... what the "xxxk"sienna.......
#107 of 126 Re: 2004 sienna check engine light [samnoe]
Jul 05, 2011 (4:34 pm)
engine light came on,vsc and trac off lights came on too,i took it to the dealer toyota capistrano where i bougth it new now its 34000 miles in it,the whole day it sat there in the afternoon they said its done so i went home as soon i got out of the dealer the same lights came back again,so turn around and take it back inside the service yard they said they dint find the other problem they change one part but they said onother park needs to be change how come desame problem did they change the wrong part ? or they dint do anything,but i've heard once you reach 30000 miles this automatically come out evry 30000 and it just need to reset something whatsoever is that,thers no actually parts to be replace am i correct,pls give me information about this problem.
#108 of 126 Re: 2004 sienna check engine light [gsnagesh]
Jul 05, 2011 (4:46 pm)
is the gas cap has something to do with that damn indicator warning light what for or its just made like that so that they can drain money ,time,on the costumer it doesnt make sence a loose gas cap can do damage just like that they should correct this problem,whoever idea is that.
#109 of 126 cannot increase engine speed + check engine light vsc trac off
Aug 22, 2011 (6:44 pm)
I seemed to have a battery problem today, was able to get a boost and get started. However, I was unable to accelerate beyond 2000 rpm. The "check engine", "vsc", "trac off" lights came on. I tested the battery, replaced it, lights are still on, still no acceleration. Cannot drive over 25mph.
#110 of 126 cannot increase engine speed + check engine light vsc trac off
Aug 23, 2011 (4:46 am)
I seemed to have a battery problem today, was able to get a boost and get started. However, I was unable to accelerate beyond 2000 rpm. The "check engine", "vsc", "trac off" lights came on. I tested the battery, replaced it, lights are still on, still no acceleration. Cannot drive over 25mph. This is a 2006 Sienna.
#111 of 126 2004 Toyota Sienna ck engine light code P0430
Oct 28, 2011 (4:10 pm)
I have a 2004 Toyota Sienna Van with about 140,000 miles on it. My check engine light came on for about a week before I got it checked at a local repair shop while getting an oil change. Van was driving just fine. They pulled a code P0430 - catalyst system efficiency below threshold (bank 2). They had to order the part, so I have continued to drive it. Later that same day, the light went off. The mechanic says he did not reset the computer.
My question is - when you get this code, how definite is it that the catalytic convertor is bad? How long can I wait to replace it? Fortunately, I went immediately to get an emission test done and the van passed. So I can get my tags with no problems next week. It is suspicious that the light went off on its own. I don't want to spend money on this if it is not necessary. But, I don't want to get stranded with kids in the van. The only thing I can think of that was different, is that I was overdue for an oil change. But, not enough overdue that the "maintence required" light came on.
I would welcome any words of wisdom. Thank You!
#112 of 126 Re: 2004 Toyota Sienna ck engine light code P0430 [mhill777]
Oct 28, 2011 (7:24 pm)
I have a 2005 Sienna and on several trips usually on the freeway or highway to Las Vegas while traveling at higher than usual speeds for a time the check engine light has come on. Later on it went off after a few days of normal driving. I do not believe this has anything to do with the oil change schedule. When i get the oil changed at Walmart every 5,000 miles, I always remind them to zero out the maintenance light whether or not it has come on.
#113 of 126 Re: 2004 Toyota Sienna ck engine light code P0430 [mhill777]
Oct 30, 2011 (4:32 pm)
The maintenance reminder system and the engine light (part of the OBDII system) are totally separate. The reminder system is on time & mileage, On Board Diagnostics is the federally mandated emission controls watchdog that monitors systems to ensure a clean exhaust.
So, on to your code... The code you logged was from a reading by the rear oxygen sensor, located behind the catalytic converter. While the front O2 sensor plays a real feedback role in regulating mixture, the rear sensor is just a tattletale device ratting you out to the EPA as a person of low moral character (just kidding...). It is suggesting that there is a real problem, but in no way impacts driveability, emissions, etc. If it wasn't that many states will not grant inspection stickers if this is a hard code, you could drive on forever with perhaps minimal impact, other than a sooty exhaust.
Now in reality, continuing to drive this way could eventually result in a clogged cat, which could degrade performance. So you do want to know why, and get it fixed.
Why did the light go out? Your system has several 'tiers' of code notation, ranging from "something happened, but it might just be an aberration", all the way up to "DEFCON 5" Armegeddon.
"Something happened" codes can go away in as little as 3 'drive cycles' (basically cold starts with some driving). More severe but fixed items go away after 40 cycles.
Sounds like your rear sensor might have sniffed out a one time burst of rich mixture, and it went away. Time will tell if it will return. Summer/Winter crossovers are common times for this to happen, as gasoline is 'reformulated'. Long drives with one pedal position & constant speed followed by a sudden off ramp (a big change in system status) have been known to trigger it on marginal systems.
Proper diagnosis can be difficult but it is essential. It could be a degrading cat, a dirty or compromised O2 sensor, bad wires or connections, or a computer issue. If you don't know what is broken, fixing it can be very costly!
And that concludes tonight's lesson!
#114 of 126 Re: cannot increase engine speed + check engine light vsc trac off [ouch2]
Dec 10, 2011 (8:06 am)
Hi, I'm habving the exact same problem with my 2011 sienna. Did you find out what was wrong and how to fix it? I called the dealer and they weren't much help at all. The mechanic i talked to never heard of this happening before. aahhhrrgg. take care.