I am working on a '96 850 Turbo that had the check engine light on with 4 codes that I was able to pull.

They were:

Low power to O2 sensor #1 (p0130)
Slow response from O2 sensor #1 (p0133)
Low power to O2 sensor #2 (p0137)
Fuel system rich (p0172)

Upon seeing that 3 of the 4 codes were directly tied to the O2 sensors, I took the deductive leap that there was a problem with the O2 sensors that were currently installed in the car...one was likely the original, and one was replaced with a universal as some point.

I purchased the OE sensors from IPD and installed them, cleared the codes and proceeded on my merry way thinking that the problem was solved.

The light came back on today. I will pull the codes and post them later today, but does anybody have a thought as to what else could trigger this response from the ECM?

This is getting rather frustrating.

 

"Low power to O2 sensor #1/2"
Wouldn't they both be recieving power (5 volt) from the ecu ?
Maybe check that with a multimeter.
If their earth wire is not making a good conection that would also upset their "power".

Note*** I have no idea about where or how they are earthed, just seems like a logical thought to me.

Maybe go over all earth points and check for loose connectors.

 

Or there may be a vacuum leak somewhere, most likely from the elbows. Double check on them.


JPN

 

The code that came back was the P0133...slow response from sensor #1.

I thought about the grounding, but that doesn't really explain the slow response code...

 

A dirty MAF (AMM) sensor can cause the same error. Pick up a can of electrical contact cleaner or MAF cleaner and spray the MAF down. Don't scrub it, dry it, or even touch it.

...Lee