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The crank position sensor or its connection is probably at fault. The engine needs the signal that the crank postion sensor provides to inject fuel and supply spark at the correct time.
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That is a whole lot of issues that needs an auto electrician and a pro grade scan tool computer. We have a pro electrician here @Jeff Armer and hopefully he will chime in. Sounds like a communication issue with BCM and ECM which I think is combined into a TIPM.
never heard of google. or an fsm ?
no engine stated
no transmission
dang that makes help hard, we are blind here, unlike you or your mechanic.
i look in my FSM and there is no P3 codes. so did Autozoned do this?
i see only one car showing that code
a Diesel Cummings.
Dodge Cummins Turbo Diesels.
surely you know what under the hood and what transmission is in the car.???
multiple code issue (evaporative, catalyst efficiency, and miss fire)doubtfull all 1 source of error but draw attention to the miss fire code PO300 is a random cylinder miss fire, possible crank position or cam position sensors.but i would check timing first.
po300 is random miss fire doubtful two O2 sensors bad at one time most likely coolant temp sensor is bad causing engine to run rich this will cause O2 sensors to throw a code(thats what they are there for..exhaust gas temp. and raw fuel) running rich will also fowl spark plugs(=miss fire) P1128 ??
po300 is Random/Multiple Cylinder Misfire Detected.This means the PCM sees misfires on more than one cylinder,so it's probably a fuel issue.You might have a bad fuel pump(bearings are binding,causing low fuel volume).It could be the in-tank filter is plugged up,or maybe the in-line filter.Start with the easiest-the in-line filter.
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