multiple codes, what can be wrong

2002 NISSAN XTERRA
12,000 MILES
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IRONMAN1011
  • MEMBER
  • 2 POSTS
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
Apr 20, 2012 at 5:41 PM
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ASEMASTER6371
  • ✓Experienced Mechanic
  • 52,796 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
Apr 20, 2012 at 5:50 PM
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