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2002 Pontiac Bonneville Poor Fuel Economy

Tiny
WBULLOCK
  • MEMBER
  • 2002 PONTIAC BONNEVILLE
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 13,500 MILES
The cars runs well but the fuel economy has dropped 100 miles per tank. I changed the fuel filter, PCV valve, plugs (very clean old ones). I suspect the heated oxygen sensor. How do I change it? Also, does this model have one or two of them?
Thanks you
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Wednesday, April 23rd, 2008 AT 10:29 PM

1 Reply

Tiny
SUSMAN28888
  • MEMBER
  • 62 POSTS
No that wouldnt be the cause.

Check your air filter.

And get a bottle of chevron techron, fuel system cleaner, works wonders!

Do you have white or black smoke coming out of the exhust? Is your check engine light on?
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Thursday, May 1st, 2008 AT 9:02 PM

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