How JustAnswer Works:
  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site.
    Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.
Ask Tim West Your Own Question
Tim West
Tim West, ASE Certified Technician
Category: Mercury
Satisfied Customers: 4638
Experience:  ASE certified Service Manager
9949505
Type Your Mercury Question Here...
Tim West is online now
A new question is answered every 9 seconds

1999 cougar 2.

This answer was rated:

1999 cougar 2.5, cel on, codes p1131,p0171
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 and 5 other Mercury Specialists are ready to help you

Related Mercury Questions