Problem with O2 Sensor

CHEVROLET IMPALA
Avatar
BRANSATT72
  • MEMBER
  • 2 POSTS
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.
Jan 4, 2006 at 2:55 AM

What to check next

Diagnostic guidance. Suggested checks and possible repairs are separate from the owner's reported results.

Obtain the exact code and sensor position, then have the heater supply, wiring and control circuit checked against the vehicle diagram before another sensor is fitted.

Guidance references and applicability

Source: This question and its visible discussion. The roadmap distinguishes the original owner's reports from other participants' experiences; proposed follow-up is editorial guidance, not a confirmed diagnosis. Fluke: Diagnosing voltage drops https://www.fluke.com/en/learn/blog/automotive/electrical-automotive-troubleshooting General support for loaded circuit testing; use matching vehicle specifications.

Read the replies · Discussion summary and reported outcome

AI-ASSISTED GUIDANCE · REVIEWED BY 2CARPROS
Avatar
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.
Jan 8, 2006 at 2:08 PM
Avatar
TOOLMAN
  • MEMBER
  • 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.
Jan 11, 2006 at 4:04 AM
Avatar
BRANSATT72
  • MEMBER
  • 2 POSTS
Thanks toolman! I'm going to give this a try today. I'll let you know how it turns out. :D
Jan 17, 2006 at 6:47 AM

Discussion summary

Problem with O2 Sensor

A reported bank-two oxygen-sensor heater-circuit fault returned after the sensor was replaced twice and codes cleared. Another participant described apparent improvement on a different vehicle after MAF cleaning.

Reported outcome: The original owner planned to try a suggestion but supplied no successful follow-up.

The other participant's MAF-cleaning result does not confirm a remedy for this heater fault. Carburetor-cleaner use on a MAF is not endorsed.

Read the original discussion

AI-ASSISTED SUMMARY · REVIEWED BY 2CARPROS
Add a reply
Join 2CarPros for free, one of the most advanced car repair communities on the internet. From first-time drivers to seasoned mechanics, everyone is welcome to reply, share details, and get better answers. You can add a temporary image or video first; uploads are limited to 20 MB.

Ask a new question

Frequently Asked Problems for This Vehicle