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Multiple codes, what can be wrong

Tiny
IRONMAN1011
  • MEMBER
  • 2002 NISSAN XTERRA
  • 12,000 MILES
Multiple codes showing
Po328
Po122
Po158

knock sensor, pedal position sensor, and O2 sensor

Idles at 1800 rpms cold, warm idle at 500 rpms, hesitation in acclerator, exhaust smells bad, lack of power, when transmission starts to shift into second gear- it does a downshift then shifts. Drive about 30 feet, chek engine light comes back on.

replaced throttle position sensor, checked for bad grounds and vacuum leaks, replaced spark plugs, added some ground wires, erased codes numerous times

I NEED HELP
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Saturday, April 21st, 2012 AT 12:41 AM

1 Reply

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
You need someone with a real scan tool to help you. They need to monitor the o2 sensor long term trims. You have issues with fuel mixture and you need someone experienced to determine the failure.

Roy
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Saturday, April 21st, 2012 AT 12:50 AM

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