My car has eaten up many coils. They are easy to replace and I assumed that after 240,000 miles I should expect a few to burn out. Sound about right?
But I am also getting those codes... P0171 and P0174, lean bank 1 and 2. Are they related? I dont think so. A friend of mine owns a NAPA and subscribes to a service called "Service Repair Solutions, Inc." ... here is what that service said regarding those codes:
Engine Control Module (ECM) receives information from the heated oxygen sensor about fuel/air mixture in different load areas. If ECM registers that fuel/air mixture deviates too much from the targat lambda, so that adaptations from Bank 1 end up in any of its end-positions, the diagnostic trouble code is generated.
- Too high ethanol content in fuel
- Incorrectly installed/damaged oil dipstick (air leakage)
- Damaged or Incorrect type of injector values
- Air leakage, exhaust pipe
- Low fuel pressure
- Damaged mass air flow sensor
- Malfunction indicator lamp (MIL) lit
- Poor performance
- Engine misfires
- High idle rmp
So, I am getting the misfires but after replacing a coil the CEL does not go away, even after I clear the code.
Some looking around produced the possibility that it was maybe the PCV oil trap cover. I do hear a hum but when I place a latex glove over the oil filler there is negative crankcase pressure (the glove does not blow up... actually wants to suck in) which is good?
What else do people suggest??? I don't want to go replacing expensive parts.