Check engine

Asked by Jul 03, 2017 at 11:31 AM about the 2000 Mercury Grand Marquis LS

Question type: Maintenance & Repair

My check engine light came on. Why
does it sa p51 and p31 on a grand
marq

3 Answers

118,555

Those are not viable codes there should be 4 digits after the P.

1 people found this helpful.

P5131

118,555

P5131 does not exist in my chart, the closest is for both upstream O2 sensors, I think I would spend the money and get the system live scanned just make sure your not chasing a grounding problem or a low or spike voltage.

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