brit2001

I'm have problems with my O2 sensors. The car goes to full rich between 30-40 mph at low RPM. Is there a way to tell which of the 4 is going bad. Its an intermitten problem but getting worse. Thanks, Laurence

dougbfresh

I'd fire up the laptop w/ my scanning software and graph the output of all the O2's on the same graph. Why do you think it's an O2????

brit2001

I have HP tuner software and sent a scan of the data as it happened to Charley at RPM in so. cal and he said it looks like a O2 problem but not in the tune. I tend to agree with him. Maybe I should just change the O2 sensors since the car has 75,000 miles on it.