2002 Pontiac Bonneville Poor Fuel Economy

2002 PONTIAC BONNEVILLE
13,500 MILES • 6 CYL • FWD • AUTOMATIC
Avatar
WBULLOCK
  • MEMBER
  • 1 POST
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
Apr 23, 2008 at 10:29 PM
Advertisement
Avatar
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?
May 1, 2008 at 9:02 PM