Background of problem:
If the car sits for an extended period (enough for it to REALLY cool down), when I start the car everything is fine for a while but then after about 5 to 10 minutes the check engine light comes on. I checked the code and it's a code for an o2 sensor. Now if I shut the car off for a few seconds and crank it back on... everything is fine for the rest of the day. The code is still there if I jump the ecu, but I have no check engine light.

On really hot days if I let the car sit for 10 minutes ideling and then drive... I get no check engine light. Could this be the sensor going bad??

Thanks!
Frank

 

up

 

Do you have a stock exhaust system?
What code # are you getting ?

 

Sometimes you may need to use an On Bboard Diagnostic system (that plugs in under your steering) to clear the code/s completely. However, I think more and likely your o2 sensor is going bad though.