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2002 Buick Regal Service engine light.

Tiny
RCH BLKWMN
  • MEMBER
  • 2002 BUICK REGAL
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 69,000 MILES
Service engine light came on about 3 days after pumping gas. I visited my nearest AutoZone, and it read defective catalytic converter (which was replaced about 3weeks ago with a brand new catalytic converter). Then the service engine light just goes off a few days later, after I pumped gas again. WHAT THE.
(PLEASE HELP, I'M A TAD BIT CONFUSED)

-RBW
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Saturday, August 21st, 2010 AT 7:31 PM

1 Reply

Tiny
MMPRINCE4000
  • MECHANIC
  • 8,548 POSTS
The code was probably "catalyst effeciency below threshold" which does not necessarly mean convertor is bad.

Could be downstream O2 sensor, or some bad gasoline.

Have garage look at O2 sensor output before doing anything else.
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Wednesday, August 25th, 2010 AT 8:29 AM

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