Problem with O2 Sensor

BRANSATT72

MEMBER
CHEVROLET IMPALA

The check engine light on. I had the local autoparts store to run a scan and it showed that bank 2 oxygen sensor heater circuit had malfunctioned. I purchased a new O2 sensor and had a local mechanic to install it. After the installation he scanned the ECM again, reset the fault code and everything showed to be working fine. The following day, the check engine light came back on. I had the mechanic to scan it again and it showed to be the same O2 sensor. It was replaced again with another new sensor, reset and everything once again showed to be working properly. The check engine light came on again the following day. Had the local autoparts store to scan again and it came up showing the same O2 sensor with heater circuit malfunction. Please help with any information. Not sure what to do now.

3 Replies

TOOLMAN

MEMBER
2 POSTS

I have the same problem as described in the previous post by Bransatt72. I have a 97 ISUZU RODEO with 11500 miles but I had the engine completely rebuild at 56000 miles. I also replaced all O2 sensors twice and I keep getting the same error code from OBDII. The car runs really great except that the check engine light keeps coming on and the gas mileage looks very poor to me.
Any suggestions are welcomed.

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Sunday, January 8th, 2006 AT 10:08 PM

TOOLMAN

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2 POSTS

I think I have a solution for you - it definitely worked for me.
I had the MAF sensor cleaned out with carb cleaner and it took care of the problem. So take out the MAF sensor and spray some carb cleaner to clean the thin wires in it. Do not touch the wires as they may break and that sensor is very expensive. Once you replace the sensor run the car for a day to have the system dry out well from the carb fluid as it will affect the EGR valve too. Then clean the error codes from the computer with the OBDII tool. That should take care of the problem. It worked on my car and I was trying to figure this one out for over a year.

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Wednesday, January 11th, 2006 AT 12:04 PM

BRANSATT72