Need help with Po171 and Po172

Packwoodrick · May 1, 2015

Hello everyone,
I am looking for some help with my 2004 Dodge ram 1500 Quad with 5.7 Hemi. I am getting 2 codes. Po 171 and PO172. Lean and Rich on bank one.
Doesn't make sense to me. I have replaced the IAT and the MAF sensors. Reset the computer. The codes are gone for a while but always come back on.

Any Ideas?

Rick

AlexP · May 8, 2015

Hello,

- Faulty front heated oxygen sensor
- Ignition misfiring
- Faulty fuel injectors
- Exhaust gas leaks
- Incorrect fuel pressure
- Faulty Mass Air Flow (MAF) sensor

Read more: P0172 Dodge Fuel System 1/1 Lean Fuel System Rich OBDII Engine Light Trouble Code | Engine-Codes.com

I would see about having a live test done with an OBDII scanner to read the levels of the oxygen sensor, and if that is out of sync then replacing it could solve your issue.

BigSloth · May 29, 2015

If it's throwing both the lean, and rich codes for that bank, then I agree about checking the front o2 sensor output.

It's probably going to either be that or a sticking fuel injector.

sylver91 · May 29, 2015

Vacuum leaks can also throw these codes.

Need help with Po171 and Po172

Packwoodrick

Junior Member

AlexP

Junior Member

BigSloth

Senior Member

sylver91

Senior Member

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