I recently bought a 1998 Z28. the first week I had it, I was getting on it a bit, and the ses light came on. I took it to a local mechanic because I needed to get brakes done and a few other things and they pulled the codes. They said I needed number one and number two O2 sensors, so I had them replaced. Well I left there and the light came on again. I have been back for them to pull the codes and turn it off for me. They showed me and it said the the #1 and #2 sensors are reading low voltage. Anyway, they said drive with it on for a couple more days with the new O2 sensors and then come back. Well I was driving yesterday and it went off for about 15 minutes, and then popped back on!! So I was wondering if anyone else out there has had the same problem and what the remedy is? The mechanics said it could be a faulty wire... Any input would be appreciated, Thanks!

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Update: 5/9/09:
Light seems has went out on its own for two days, then came back on when I hit 4000 RPM in 3rd gear. Then went out a day and a half later, only to come back on when I hit 90mph in 4th gear. It has now gone back out after driving a little bit. I have not been able to have the codes pulled, but I believe it would read the same codes regarding low voltage to the number one and number two sensors.... This is odd

 

the car drives ok otherwise?

 

Yeah... drives real well and doesn't have a great deal of miles either, only 77,000.

 

they didnt fix the problem. nore did they patch it. u have a voltage problem like they said. try to follow the O2 SENSOR wires. they might be pinched somewhere causing a short somewhere. try to find a schmatic of the wire that feeds both of the o2 sensors. its almost impossible for 2-o2 sensors to take a ****. ur vehicle does prob drive well. with the light off. when the light comes on ur fuel/air ration goes to ****. meaning prob something in the 10mpg area LOL