2004 Toyota Avalon Check Engine light, CVS and traction ControlHe


Asked by Jan 11, 2017 at 07:38 PM about the 2004 Toyota Avalon XLS

Question type: Maintenance & Repair

I hope someone can shed some light on my current problem. I replaced the started in my wife's 04 Avalon today and checked the starter and ignition for continuity. After putting the starter and air box and battery back in place I now have a check engine light and the VSC and traction control is disabled. I tried clearing the codes and nothing. Any help would be awesome. Thank you!!

7 Answers


I believe you may have disturbed wires going to the wheel speed sensor. You said you cleared the codes, what where they? More than likely it is going to be some wires on the side you worked on the starter. And it is probably going to be a bad wire.

1 of 1 people found this helpful.

Hello, thanks for the reply. The code was P0155 Bank 2 sensor 1. I just can't see how an 02 sensor would go bad at the same time i changed the started. I took my time and even cleaned up the grounds and made sure everything was nice when I put the new starter in. I also tried cleaning the gas fill and lubricating the 0 ring.

1 of 1 people found this helpful.

Co Incidence?>>- P0155 TOYOTA - O2 Sensor Heater Circuit Bank 2 Sensor 1... Possible causes - Faulty Heated Oxygen Sensor (H2OS) Bank 2 Sensor 1 - Heated Oxygen Sensor (H2OS) Bank 2 Sensor 1 circuit fuse - Heated Oxygen Sensor (H2OS) Bank 2 Sensor 1 harness is open shorted to ground - Heated Oxygen Sensor (H2OS) Bank 2 Sensor 1 circuit poor electrical connection - Faulty Engine Control Module (ECM)..... The code means that there is a problem with the heater element circuit of the heated oxygen sensor. The Engine Control Module (ECM) monitors how long it take the sensor to warm up and start sending an adequate signal. The code means the the sensor is taking too long to warm up. Replacing the Front Heated Oxygen Sensor (H2OS) Bank 2 usually takes care of the problem.


But this has nothing to do with the traction control and VSC. Your scanner must not pick up ABS codes?


Thanks for the info! At least that O2 sensor is the easiest 1 to get too! I just cant believe that it went bad but may just be a coincidence at 100k miles. Do you think that that could trigger the VCS light and disable the traction control?

1 of 1 people found this helpful.

10/4 yes no other codes came up. I read online were if the motor on the toyotas are not firing/running right the traction control system gets disabled. There are so many instances of people having the same problem with the three lights appearing. One was an oil change, the other a new alternator. I am frustrated.


Anything else?

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