The other sensor is should be idle air control? Clean the throttle-body and idle air system.

Answered by JDL (expert)
14,456 answers provided

It's probably the idle control motor. Unplugging it would hold it in it's current position but it would be unable to compensate idle speed when needed.

Answered by Wrenchtech (expert)
14,829 answers provided

Find the idle air control valve and clean it and see what happens

Answered by rasmataz
68 questions asked

i was able to clean the i a c , car starts up great , as soon has i push the throttle then it starts it runs rough , turn car off crank again runs great . any ideas

Response from mrffbob
1 question asked

Po172 is bank 1 one sensor 1, system rich. In your first post, you said intermittent rough idle. When you open the throttle, it should bypass the iac. I'd use and check fuel pressure, for a start. Not only check for correct pressure, check that the pressure doesn't drop like a rock, with everything off. You might force the system lean, if possible, to see if 02 sensor will react.

Answered by JDL (expert)
14,456 answers provided

i had a car in my shop with the same problem. it turned out to be the after cat o2 sensor was stuck rich at .910 ma. It was not told to me by the customer first but, when she had the oil changed her oil guys noticed the un-plugged o2 sensor. they decided to plug it in and 2 days later her cel turned on with p0172. I replaced both and solved the problem.

Answered by duanejacques
0 questions asked

He asked the question nearly a year ago. i think he might have it resolved by now.

Answered by Wrenchtech (expert)
14,829 answers provided

Yeah duh teach me to look at dates haha. Oh well i was in the middle of looking at some other problem and thats what happened honest

Answered by duanejacques
0 questions asked