Problem with my 1999 Buick Lesabre
3800 V6
GM Computer codes P0420
Repair work done prior = 3 1/2 months ago mass air flow sensor changed,
3 months ago new catalytic converter
GM tech = JK
question = 3 1/2 months ago I changed the mass air flow sensor and then
had a new catalytic converter installed 2 weeks later. Car runs fine but now
I have the check engine light coming on several months later. Auto zone
ran the handheld test and received the P0420 code for catalyst system
efficiency below threshold(bank 1) Could it possibly be the O2 sensor?
3800 V6
GM Computer codes P0420
Repair work done prior = 3 1/2 months ago mass air flow sensor changed,
3 months ago new catalytic converter
GM tech = JK
question = 3 1/2 months ago I changed the mass air flow sensor and then
had a new catalytic converter installed 2 weeks later. Car runs fine but now
I have the check engine light coming on several months later. Auto zone
ran the handheld test and received the P0420 code for catalyst system
efficiency below threshold(bank 1) Could it possibly be the O2 sensor?
/
It is possible that an 02 sensor is causing this problem. But since the
replacement converter lasted awhile before the code came back, it may very
well be that the cat. converter is bad again. This can be caused by a few
different things. From engine running a little rich, to misfires (although you said
the car is running fine), to poor / contaminated fuel quality, or just a cheap -
poor quality converter. The $89 converter at the local exhaust shop have given
us many problems over the years trying to correct repeat P0420 codes.
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