GL450 OB2 code po172 cant fix??
05-07-2022, 11:20 AM
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Mercedes GL450
GL450 OB2 code po172 cant fix??
Good Afternoon ladies & gents,
I recently bought a used 2011 GL450 and 1 week after I bought it the service engine soon light came on. bought a scan tool the code it throws at me is PO172 bank 1 Rich. i changed the MAF sensor already and just did the both O2 sensors on the passenger side with the correct parts but the light is still on? I am not a mechanic by any means but I am mechanically inclined. anyways do I drive the car for some mile to see if the PCM re-calibrates and kicks the check engine light off? also not sure if I should change spark plugs also while I am at to see if one of them is not firing correctly but I didn't get that code for a misfire so I am unsure. i was thinking if it doesn't kick off soon should I try a MAP sensor and see if that works?
I recently bought a used 2011 GL450 and 1 week after I bought it the service engine soon light came on. bought a scan tool the code it throws at me is PO172 bank 1 Rich. i changed the MAF sensor already and just did the both O2 sensors on the passenger side with the correct parts but the light is still on? I am not a mechanic by any means but I am mechanically inclined. anyways do I drive the car for some mile to see if the PCM re-calibrates and kicks the check engine light off? also not sure if I should change spark plugs also while I am at to see if one of them is not firing correctly but I didn't get that code for a misfire so I am unsure. i was thinking if it doesn't kick off soon should I try a MAP sensor and see if that works?
05-07-2022, 12:33 PM
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2017 GLE350 4MATIC
If you have a 2011 model year, you have an X164. This is the X166 section.
Try posting the question in the X164 section where owners will see it.
Regarding the symptoms I would start throwing parts at it starting with sensors as you have done some of already.
Try posting the question in the X164 section where owners will see it.
Regarding the symptoms I would start throwing parts at it starting with sensors as you have done some of already.
