All of a sudden my check engine light came on the other day. so i took it to a mechanice and we put it on the diagnostic tester, the only error that came up was a bad 02 sensor. the rear right one was bad, so that was the one that was replaced.. so i leave and 20 mins later it comes on again.. so i took a diagnostic tester from work the othernight and hooked it up and it came up as bad o2 sensor again..so i cleared it, went for about a 25 mile drive before i came home last night and it was good to go.. got up this morning now the damn thing is on again. I have no idea what to do..its annoying the heck out of me. i dont want to pull the bulb out in case something bad were to go wrong, but i want to fix it. any suggestions?
check engine light
- Thread starter kgraham1
- Start date
Check electrical connections to/from sensor. I am not sure if your sensor is the heated variety or not but just because the code comes back saying it's a particular O2 sensor does not automatically mean it is the sensor itself. After clearing codes, it takes a bit of time before the readiness signals are active and this is the reason it did not come back immediately as being faulty. Remember that the code you read is really saying the sensor circuit.
232_slowness
New Member
maybe you replaced the wrong one. Happens all the time at work. We'll end up replacing the wrong sensor and go... oops... then replace the other one and the light never came back on. Try the other sensor on the same bank.
I know that this is necro-posting but I just fixed a problem with the Check Engine Light by cleaning up the butterfly valve on the throttle body. This was tripping 2 codes on Autozones computer. I don't remember exactly what the numbers were, just remember it said Bank 2. Also, below were a few of the suggestions of what was wrong.
M.A.F sensor
Ignition Wires
O2 Sensor
Injector Leak
Clogged Injector
Ect...ect...ect
The problem was at idle the butterfly wasn't seating all the way causing a lean air/fuel mixture at idle. I took a can of carb cleaner and a toothbrush, cleaned it all out, reset the computer by disconnecting the negative cable on the battery and walaa...no more CEL. I am not saying that this will work in every case but it's a really easy fix if it does work.
This problem will only cause the CEL to trip while at idle like at a stop sign or light. If your light comes on while throttle is engaged it's most likely not the issue.
M.A.F sensor
Ignition Wires
O2 Sensor
Injector Leak
Clogged Injector
Ect...ect...ect
The problem was at idle the butterfly wasn't seating all the way causing a lean air/fuel mixture at idle. I took a can of carb cleaner and a toothbrush, cleaned it all out, reset the computer by disconnecting the negative cable on the battery and walaa...no more CEL. I am not saying that this will work in every case but it's a really easy fix if it does work.
This problem will only cause the CEL to trip while at idle like at a stop sign or light. If your light comes on while throttle is engaged it's most likely not the issue.
RED98
Member
ChingonStang
Member
Funny!What's up with Stang's and O2 sensors...I had that problem with my 96 Stang for the longest time before I sold it.
Did you have any exhaust work done before the light came on kgraham1?
For inspection, they put the computer on it and look for codes. If you have them then you don't get an inspection...at least where I live. Not to mention, after cleaning up the TB the computer had to adjust a lot. It barely ran on the adjusted setting. After a couple of seconds of it running it started running a lot better than before. Anyway, just thought I would throw that tip out there in case anyone else had the same problem.
ChingonStang
Member
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