06 Sienna XLE LTD engine check,vsc,trac off ON - Toyota Nation Forum : Toyota Car and Truck Forums
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#1 Old 02-27-2012, 05:23 PM
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Question 06 Sienna XLE LTD engine check,vsc,trac off ON

My 06 Sienna XLE LTD check engine, VSC and TRAC OFF lights all came on suddenly while I was driving. Check engine light was stable not blinking. Checked gas cap. Van has 90K+ miles. What's wrong??
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#2 Old 02-27-2012, 06:12 PM
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I'll tell you what, bamamum, If I could tell from here by reading your problem, I could finally lock my toolbox for good and just do internet diagnosis. hmm, has a nice ring to it.
I'll go out on a limb and say it's an OH-TWO sensor.

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#3 Old 02-27-2012, 09:51 PM
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Get it scanned, that's the only way you'll know. Based on those lights my guess is something with the ABS system, perhaps a wheel speed sensor. But that's purely a guess.
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#4 Old 02-29-2012, 09:36 PM
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Don't be too concerned about the multiple lights. I have been told that the TRAC and VSC lights come on frequently with any check engine light. I got them all when I changed the air filter and forgot to plug the mass air flow sensor back in.

As Dandaman said, get it scanned. Autozone will scan it for free.
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#5 Old 09-05-2012, 08:42 AM
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I have a 2010 sienna limited with similar problem VSC, TRAC OFF and Check engine lights were all on. I had it read and determined that it was an emission problem. After many trips to dealers and auto parts, I could not bear that thought of paying for a new charcoal canister which is not covered under warranty and runs about $1k parts and labor. Did I mention that I also have to do 2 year emission in the stay of Maryland? Well, this weekend I finally fixed the problem and passed the emission this morning. If you still need help with this I would be happy to write something up. In short, I took everything apart and spray WD40 in the two vacuum valves and charcoal canister valve. I suspected that the valve was stuck and did not open under pressure. After I sprayed WD40 and I also cleared all tubes out. This seemed to have fixed the problem.

Last edited by 2010SiennaLimited; 09-05-2012 at 08:43 AM.
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#6 Old 09-05-2012, 08:02 PM
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Depending on the reason for the Check Engine Light, you may also get the appearance of TRAC and VSC lights (disabling of those systems). The action of those systems may involve modulation of brakes, throttle, ignition timing, transmission function, etc., and could aggravate a condition that caused the fault and triggered the CEL. So the system will work to protect itself along with making it plain and obvious to you that you should not just ignore it.

As the emission rules have tightened over the years, it seems that the presence of the other lights is simply becoming more common. Again, probably to help force you to do something about it, and less for self-preservation purposes.
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