Not so common P0300 and P0171

[CombatClinicianRN]

Ok I have a 2018 Jeep Wrangler JLU 3.6L I got the P0300 and P0171 a few months ago and have tried multiple different things but here’s the run down. I replaced the upstream BANK1 O2 sensor, top and bottom intake seals, fuel injectors, PCV and EVAP control, performed a Smoke test and am still getting smoke out of the PCV return line to the intake manifold the PCV is good. Im not sure if I should just compression test each cylinder or do a leak down test. Also I have a MUCAR 08 OBD2 reader that says the only cylinders misfiring are 2 and 6 I could just go ahead and replace the spark plugs again but looking for information before I keep throwing money at this thing! Thanks in advance!

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[Sage59]

I have the same codes error and I am starting to look into it. I plan on replacing my O2 sensors, VVT and sparks plug. My jeep as 110K so it is due for some maintenance. I'll let you know if i find anything that resolved this issue.

 

[mwilk012]

I have the same codes error and I am starting to look into it. I plan on replacing my O2 sensors, VVT and sparks plug. My jeep as 110K so it is due for some maintenance. I'll let you know if i find anything that resolved this issue.

Have you opened the hood yet?

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