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Help us help you. By posting the year, make, model and engine near the beginning of your help request, followed by the symptoms (no start, high idle, misfire etc.) Along with any prevalent Diagnostic Trouble Codes, aka DTCs, other forum members will be able to help you get to a solution more quickly and easily!

1991 ford f150 5.0 o2 sensor stuck lean

  • Griffin
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8 months 6 days ago #78458 by Griffin
1991 ford f150 5.0 o2 sensor stuck lean was created by Griffin
I did the test light  test going from battery positive to o2 signal wire to go rich ,but scanner only shows .218 volts not 1 volt . Does that means my pcm is bad ? Or can I do another test to verify.  Thanks everyone 

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8 months 6 days ago #78499 by ferris48
Replied by ferris48 on topic 1991 ford f150 5.0 o2 sensor stuck lean
check the signal wire direct at the computer. Voltmeter on computer, test light at o2 signal wire.

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8 months 5 days ago #79172 by Griffin
Replied by Griffin on topic 1991 ford f150 5.0 o2 sensor stuck lean
Thanks for taking your time. It shows 12 volts engine off

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