Mechanics

WHAT IS THE SENSOR BELOW TPS ON A 2.4 DOHC

2001 Dodge Stratus • 165,000 miles

Car sets code P0172, it has rough idle sometimes, replaced o2 front sensor, plugs, tps, checked egr. There is a sensor below the tps that has a 4 wire plug, I unpluged it while running rough it did not effect the way it runs?
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Mrffbob
November 17, 2011.



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


JDL
Nov 17, 2011.
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.


Wrenchtech
Nov 17, 2011.
Find the idle air control valve and clean it and see what happens


Rasmataz
Nov 18, 2011.
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


Tiny
Mrffbob
Nov 21, 2011.
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.


JDL
Nov 21, 2011.
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.


Tiny
Duanejacques
Aug 12, 2012.
He asked the question nearly a year ago. I think he might have it resolved by now.


Wrenchtech
Aug 12, 2012.
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


Tiny
Duanejacques
Aug 12, 2012.