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Failed Emissions test code P1691 Failed Emissions test code P1691
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Old 10-13-2010, 09:58 AM   #1
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Failed Emissions test code P1691
Failed in MD. P1691 trouble code. Anyone know what this code is?

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Old 10-13-2010, 11:05 AM   #2
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my 1997 service manual says "MIL Interruption in wiring" "Check wiring from ECM to instrument cluster for continuity"

Seems there is a problem with the wiring to light your CEL which automatically makes it light up. (1997 manual which should still be correct)
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Old 10-13-2010, 11:39 AM   #3
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It could also mean that the CEL light bulb is out. I had the same code a while back and replacing the bulb fixed it.

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