Check engine and TCS lites on

[NH123]

My '03 has recently had both lites come on. Code P0135, which is o2 sensor heater. Seems strange that both lites came on. Anyone experience this?

 

[itrsteve]

Yes, it's your O2 sensor (well, one of them)

 

[NH123]

Any suggestions how to tell which pre cat one it is?

 

[wagyshag]

Yes, I had the same occur on my '02. For mine it was Bank 1, Sensor 2. When replaced, both the TCS and CEL remained off.

If the Autozone diagnostic is unable to identify the specific Sensor, you will need to have the Dealer run the diagnosis.

 

[9doors]

It's Bank 1, Sensor 1. Rear Primary Heated Oxygen Sensor. Yes, both lights come on when the O2 sensors give up the ghost.