Question about 2001 Pontiac Grand Am SE

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My service vehicle soon light is on and i had a mechanic put it on his machine and he says its the heated oxygen sensor i know my vehicle has 2 oxygen sensors are they both heated sensors? how do i know which one to change?

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Well the machine the mechanic used will tell him something like what bank side its on like bank 1 or bank 2 senors 1 .2 etc if you go to auto zone the scanner can tell what pos it is but some times the can be wrong if theres other promblems first

Posted on May 09, 2010

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