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Well, 02 sensors are good. Problem is...#4 injector valve is not working. Has extremely low compression. Gonna need a new engine.

I ordered one from FLAGSHIP1. Will arrive in @5 days, already programmed to my jeep. I've run out of shit to fix, so this is my last resort.

I had it at a garage for two days and they couldn't figure it out. I think a 02 sensor may be bad without throwing a code, like you mentioned. Garage said they were all good, but didn't know how to test the PCM, so...Or pcm is going. But, I am looking for a local garage that knows what they're...

Thanks. Not sure my reader will read these, but will check.

Yes and no on map sensor and maf.

02 sensors are good. spark plugs, plug wires and coil pack were all put on @3 months ago. Put on new map sensor. New maf(air intake temp. sensor. New #4 injector and two air leaks fixed. Catalytic converter is good

I have a 2008 wrangler unlimited x jk. I've been getting Po172 and PO300 codes,with flashing cel. Have replace maf sensor, map sensor, crankshaft position sensor. Garage replaced #4 injector and fixed two air leaks. Still got codes. I need help with this . Could it be a bad pcm?