2000 Pontiac Montana OBD codes

Tiny
RONLOCK
  • MEMBER
  • 2000 PONTIAC MONTANA
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 11,600 MILES
A year ago, code 0131 (O2 sensor low volts bank 1 sensor 1) and 0137 (. Bank 1 sensor 2)appeared intermittently. I had rear O2 sensor replaced. Both codes returned a couple of months later. I got a Scanguage to read and clear them. They re-appear every few weeks. Ive been clearing and ignoring them. They usually appear upon moderate acceleration from a parkway toll booth. No engine symptoms at all.

Just got codes 0131, 0137, and 1404 (EGR valve pintel stuck open) upon leaving a toll booth. They cleared OK. Still no engine symptoms, it runs fine.

All codes related? Is this a necessary fix - by replacing EGR and front O2. Something else going on?
Thanks, Ron
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Friday, March 27th, 2009 AT 3:40 PM

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Tiny
BLUELIGHTNIN6
  • EXPERT
The O2 sensor may be failing due to the faulty EGR valve. You also need to have the cat. Converter flow tested to ensure it is working properly as a faulty converter will also throw an O2 sensor code on the computer. Both components will cause poor fuel mileage and fail emissions test if required by state law.

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Friday, March 27th, 2009 AT 3:53 PM

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