02 Buick p0420 code fix?
2002 buick lesabre limited; engine
light coming on w/a P0420 code
&/or P0440 code being reason
when i plug in OBD II... How do i
PERManently find issue & fix..?
Other issues include:
1. Gas guage either reads Full or
Empty when driving. Parkd
running gauge may pnt to actual
gas level, but not when driving.
(Seems to read full over half tank
then empty at half n below????)
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