P0140 99 Pontiac Montana Code

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  • Dtnel
    Junior Member
    • Feb 2017
    • 24

    P0140 99 Pontiac Montana Code

    Have a code for a Pontiac Montana as stated above. Don't know if it's the one behind the catalytic converter or ahead. I did save a data scan from the vehicle. At idle the trims are -25. And 0 unless I run 2500 rpm's for a minute or two till they evened out within a few. I'm new to the Modis Edge and even tried the solus edge prior to that. Definitely more codes. This will help me in time for sure.
  • Joe Rappa
    Snap-on DSD
    • Aug 2007
    • 2050

    #2
    P0140 is a code for no activity on the Rear O2 sensor. This would be the one behind the Cat, Bank 1. I'm pretty sure that engine only has two O2 sensors, one front, one rear.
    Look at your O2 data. What does the rear O2 do? Once it is warn it shouldn't move around a lot, but you should be able to get it to move a bit if you force the engine rich or lean.

    Joe
    "You don't build a reputation on what you're going to do"
    Henry Ford

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