I think mass air sensor is bad.could a bad o2 sensor be the real problem

Asked by Jul 07, 2016 at 11:17 PM about the 2000 Pontiac Grand Prix GTP

Question type: Maintenance & Repair

2 Answers

261,215

hard to say without the 4 digit codes and some diagnostic work. I hate replacing parts just because. Have the car scanned for the codes, your local auto parts store will do it for free in most cases. post the codes back here.

13,345

Scan it both are control signals to the computer for air fuel ratio. HEGO is only active after closed loop mode criteria is meet.

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