2002 Pontiac Bonneville



April, 23, 2008 AT 10:29 PM

Engine Performance problem
2002 Pontiac Bonneville 6 cyl Front Wheel Drive Automatic 135, 00 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

1 Answer



May, 1, 2008 AT 9:02 PM

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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