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Which oxygen sensor most likely faulty?

06-20-2009, 03:33 PM
I have a 2002 Ford E-150 85,000 mis with the "service engine soon" light on. Checked the codes and I think this is a bad O2 sensor. Since I've been told there are three on this vehicle (1 on each side in front of the converter and 1 behind the converter), can someone tell me which one is most likely to fail first?

Thanks for the help.

06-20-2009, 07:48 PM
My scanner states which sensor to check.

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