CA smogging questions

[Jim Wright]

My wife's '01 Quest had a P0402, replacing the indicated O2 sensor didn't help, we ended up also having to do the knock sensor.  Don't know if that will be required here or not, but there may be more to the story there.


On May 4, 2011, at 7:06 PM, David Pertuz wrote:

> Khiem and Martin,
> 
> Thanks. He is definitely, definitely not a car guy. I have to dial way back on the detail and jargon I use when I talk about the car. So no troubleshooting for him. I forgot to mention that the car did have a CEL here. IIRC, it was a P0402, which is 'rear o2 reading high' or something like that - something with the rear O2 sensor, anwyay.