Question about 2005 Scion xB

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VSC, Trac off, and check engine lights are on

I figured the codes out and it turned out to be the oxygen sensors and the catalytic converter, the lights came on a little after 100,000 miles.. typically thats around the time a catalytic converter should START to go out? now roughly around 112,000 miles i noticed some problems with my transmission jerking and my engine reving at waayyyy to high of RPMs, so its a new problem i have to figure out.. can anyone help?

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  • jdjjones356 Apr 26, 2009

    Just had my 2005 scion serviced and just needed an oil change about 2 weeks ago, 60K miles on it and now the VSC, Trac off, and check engine lights are on. HELP!!!

  • fshes May 04, 2009

    My 2005 Scion XB has the VSC, Trac off and engine lights on, with 52K miles and a recent oil change.

  • GENE FARLEY May 11, 2010

    Anytime your check engine light comes on your VSC and trac is disabled
    and those lights come on. Both of you probably have different problems. A check
    engine light can be caused by many things and you need to have the
    codes read to get a solution.

  • Marc Lee Winnig Mar 18, 2013

    Don't see HOW that could be related to an O2 sensor! COMPLETELY different systems!



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I took mine to the dealer to find out why the VSC, Trac off, and check engine lights are on. They said it is the camshaft position sensor, it retards the timing, and causes it to lose power when climbing. Also, 1 of every 30 to 50 scions have this problem. Sounds like it should be recalled for this. The cost of replacement is about $500 bucks. Get your dry belts and valve cover gaskets changed at the same time to avoid labor charges later. I couldn't believe the dealer charges $89 bucks an hour for labor these days, Rediculous. At least it comes with a a 12 month unlimited mileage warrenty.

Posted on May 05, 2009

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On my 2006 xB it was the brake fluid FOR SURE.

I disconnected the battery to reset the ECU. I reconnected the battery, started the car, no warning lights. I drove for 15 minutes and the warning lights came back on. I read wojodr's post, above, added some brake fluid, reset the ECU, and went for another drive. I drove for more than a half hour and no warning lights. Brake fluid, for sure.

Posted on Oct 13, 2012

  • geokrpan
    geokrpan Oct 14, 2012

    One more thing. It is possible to overtighten the gas cap. There is a warning printed on it to tighten it ONE CLICK ONLY or the check engine light may come on. My xB is a 2006 model, 5 speed.


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My VSC and check engine light came on when the master cylinder was low on fluid

Posted on Oct 17, 2009

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The vsc light and the trac off light and check engine light all came on at the same time code p0420 comes up on my 2005 highlander what does this mean?

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Hello, VSC, Trac OFF and Check Engine lights turn on when i was driving. Whats means ? In Autozone said me that problem is with the catalyst system. Thanks for your advise.

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My check engine light came on at the same time as trac off/vsc

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Jun 15, 2010 | 2002 Toyota 4Runner

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You have to know what code is stored to fix the problem. Toyota's will generally display a Check Engine light, VSC and TRAC light all at the same time, even if it's a simple problem with an oxygen sensor (for example). You can disconnect the negative battery cable for a few minutes, even though you should a scan tool should be used, to clear out the code.

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VSC Trac off/ VSC Trac

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I have a 1999 ES 300 with the same problem. I took it to an independent repair center, (Big O Tires). They ran the codes and it told them it was one of three oxygen sensors in the car. There are two sensors for the engine, (one on either side of the V6 engine), and one for the catalytic converter. The bad part is this sensor is located AFTER the cat. converter, which means it could be the converter, (about $1500.00), or the sensor, (about $250.00). After checking all sensors, it was determined it was PROBABLY the sensor after the converter. I had the sensor replaced and so far the lights have not come back on. Seeing that your car is a 2003 model, I really don't think it could be the converter. If you have been dealing with a reputable repair center, go there. Otherwise go to the dealer and see what they say. If they recommend the converter, push for the sensor. That way you are only out $250.00! Good Luck!!!

Feb 21, 2009 | 2002 Lexus ES 300

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08 highlander...VSC & check engine light came on....

Code PO158= Oxygen sensor, bank 2 sensor 2. On a V-6 it will be opposite side of engine from #1 cylinder & after catalytic converter

Feb 05, 2009 | 2008 Toyota Highlander

1 Answer

Engine code p0421

Catalyst System Efficiency Below Threshold (Bank 1)

The catalytic converter has an oxygen sensor in front and behind it. When the vehicle is warm and running in closed loop mode, the upstream oxygen sensor waveform reading should fluctuate. The downstream O2 sensor reading should be fairly steady. Typically the P0420 code triggers the Check Engine Light if the readings of the two sensors are similar. This is indicative of (among other things) a converter that is not working as efficiently as it should be (according to specs). It is part of the vehicle emissions system.

A code P0420 may mean that one or more of the following has happened:

* Leaded fuel was used where unleaded was called for
* An oxygen sensor is not reading (functioning) properly
* The engine coolant temperature sensor is not working properly
* Damaged or leaking exhaust manifold
/ catalytic converter / exhaust pipe
* Retarded spark timing
* The oxygen sensors in front and behind the converter are reporting too similar of readings

To Do list

* Check for exhaust leaks at the manifold, pipes, catalytic converter. Repair as required.
* Use a scope to diagnose the oxygen sensor operation (Tip: The oxygen sensor in front of the catalytic converter normally has a fluctuating waveform. The waveform of the sensor behind the converter should be more steady).
* Inspect the downstream heated oxygen sensor (HO2), replace if necessary
* Replace the catalytic converter

Jan 04, 2009 | 2001 Hyundai Sonata

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