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Tim West
Tim West, ASE Certified Technician
Category: Mercury
Satisfied Customers: 4638
Experience:  ASE certified Service Manager
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1999 cougar 2.

Resolved Question:

1999 cougar 2.5, cel on, codes p1131,p0171
Submitted: 3 years ago.
Category: Mercury
Expert:  Tim West replied 3 years ago.
Chat Conversation Started
Tim West :

Thanks for visiting Just Answer,

Tim West :

If there are no vacuum leaks, this is more than likely a problem with the o2 sensor.

Tim West :








The #11 O2 sensor is the sensor in the exhaust manifold of the rear cylinder head.

Customer :

I was leaning in that direction. Just wanted confirmation.

Tim West :

Yea, the MAF is possible, but the o2 sensor is most likely.

Tim West :

When these 2 codes are together history shows o2 sensors have fixed the problem.

Tim West :

DO you have a scan tool?

Tim West :

still here?

Tim West :

Get back to me when you can

Customer :

Sorry. Had to attend to other business. Replaced 1 1 o2 sensor, erased code and road tested extensively. No cel so far. Sent customer on his way. Hoping for the best. I do have a scan tool that gives me data. What did you have in mind? For future reference. Thanks, Customer


Tim West, ASE Certified Technician
Category: Mercury
Satisfied Customers: 4638
Experience: ASE certified Service Manager
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