2000 Pontiac Grand Prix oxygen sensor

2000 PONTIAC GRAND PRIX
90,000 MILES • 6 CYL • FWD • AUTOMATIC
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RUSSELL350
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  • 1 POST
Hi- I recently noticed a decrease in my gas mileage.It was suggested by my mechanic that I should change the oxygen sensor. I changed only the one on the manifold and he said that I don't need to change the other near the converter. Is this true? Thank You Russell[img:99e398b6e3]http://www.2carpros.com/forum/automotive_pictures/151492_DSC00023_1.jpg[/img:99e398b6e3]
Jan 31, 2008 at 5:51 PM
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BLACKOP555
  • ✓ASE Certified Mechanic
  • 10,386 POSTS
  • ASE Certified Mechanic
he is correct, the one after the catalytic converter is used to read catalytic efficency, to see if the converter is bad or not.
Jan 31, 2008 at 7:28 PM
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