1997 Pontiac Sunfire Multiple Sensor Failures

Tiny
DROSE415
  • MEMBER
  • 1997 PONTIAC SUNFIRE
Electrical problem
1997 Pontiac Sunfire 6 cyl Wheel Drive Type unknown Automatic 174000 miles

I have a '97 Sunfire 2.4L which won't pass a smog inspection due becuase the check engine light is on. There are 3 error messages being reported: PO121 (TPS performance), PO141 (O2 sensor heater fault), PO336 (Crankshaft position Sensor failure). I understand that it is rare that all 3 would fail. It has been suggested that the cause could be related to the O2 sensor, poor grounding connection, moisture intrusion, large air mass, and a faulty ignition switch. Could you possibly help me narrow it down?

Other issues that the car is having: ETS light stays on, engine runs warm when idling, and a leak up at the front of the exhaust system.

Thanks for the help.
Sunday, January 27th, 2008 AT 3:11 AM

1 Reply

Tiny
SERVICE WRITER
  • MECHANIC
  • 9,123 POSTS
Very first thing I would do is get the leak at the front of the exhaust fixed. That will affect O2 readings.
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Sunday, January 27th, 2008 AT 9:49 AM

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