P0172 Code

[Sacha Rosenthal]

This just popped up today on my way home. Any ideas on where I should start looking/replacing?
As usual, I have no familiarity with this and have searched several sites/forums and do not really understand what many of the posts say!

Any help would be greatly appreciated, as always!

Thanks.


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[Jerry Bransford]

Probably nothing more than a bad O2 sensor. O2 sensors are like spark plugs in that they wear out and need to be replaced when that happens.

 

[Sacha Rosenthal]

Thanks Jerry.

So you reckon I should just go ahead and replace all of them, or is there a particular order I should go in?


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[Chris]

Good preventative maintenance would say to replace all of them, which is what I would suggest. They're cheap enough that I would do that for sure.

See this thread:
The Official Jeep Wrangler TJ Oxygen (O2) Sensor Thread

Make 100% certain you use the recommended NGK sensors (listed in that thread) or you'll have issues!

 

[Sacha Rosenthal]

Brilliant. Thanks Chris. As it happened I had just finished reading that O2 post and have all of them in the Amazon cart .

Looks like sensors and a Vanco big brake kit this weekend!


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[Sacha Rosenthal]

Changed all O2 sensors and then manually cleared the code.

Was great for a few days and the same code came back today.

What do you think I should look at next?!

I’ve also had intermittent stalling when in gear (forward and reverse) with wheel at full lock and just idling. I.e. foot not on gas pedal. I’ve changed the cam position sensor (few weeks ago) and the throttle position sensor (yesterday).

IAC was cleaned a few weeks back too, per Jerry’s instructions.

Thanks!


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