2000 Pontiac Grand Prix oxygen sensor

Tiny
RUSSELL350
  • MEMBER
  • 2000 PONTIAC GRAND PRIX
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 90,000 MILES
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


http://www.2carpros.com/forum/automotive_pictures/151492_DSC00023_1.jpg

Thursday, January 31st, 2008 AT 5:51 PM

1 Reply

Tiny
BLACKOP555
  • MECHANIC
  • 10,386 POSTS
He is correct, the one after the catalytic converter is used to read catalytic efficency, to see if the converter is bad or not.
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Thursday, January 31st, 2008 AT 7:28 PM

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