Sorry guys, I've searched and nothing has come up on this, I'm hoping someone has had a similar problem and can tell me where to start.
Whenever I turn the heater on, the check engine light comes on. I can unplug the battery and reset the code, light turns off and I can drive for days then the next time the heater is turned on I get the light again.
I finally took it to Advanced today and it came up with a PO420 code. The guy at Advanced told me it was an O2 sensor...that doesn't make sense, a O2 sensor isn't related to the heat.
I just bought this car and I don't know much about them. Any help is very much appreciated.
Thanks,
Jenny
