DTC p1151 and p0420

[zeevann]

i would like to know what your opinions are on these codes. Its on my 99 cougar, IK IK its not a mustang but stangnet has always been the most helpful. Thanks for any help :SNSign:

 

[hotcobra03]

Driverside front o2 and cat .when was last full tune up? Change all o2s.best i got

 

[zeevann]

last winter i did the tune up on it. i just changed oil and air filter like 2 weeks ago.

 

[hotcobra03]

Tell alittle more history.yr?engine size?you live up north?

 

[zeevann]

alright its a 99 cougar. 2.5 v6. yes i live in upstate new york. umm i changed one o2 sensor and it went off for quite come time 2 weeks. then poof cel. the thing that sucks is that its my winter car i need it inspected by the end of the month

 

[hotcobra03]

Your car sounds like it sits a lot. If you can change plugs ,pcv ect....your o2s control fuel and 1151 is your o2 on than off on off, switching like a carb had screws to adjust o2s are the screws.try 93 or 94 not sure if they use that winter blend anymore .start their.autozone bosch o2s are around 50 each .

 

[SilverBullet00]

Those cars are known for electrical gremlins. I had a friend with a 99, it was a nightmare...

Your cat could be clogged or damaged as well. did you replace the 02 sensor with an ford motorcraft part?

 

[zeevann]

i bought a Bosch one

 

[zeevann]

both rear o2's are replaced now and p0420 is still coming on

 

[zeevann]

well it turns out my old cougar just needed an update from ford to fix the problem.

 

[hotcobra03]

What was the update? Glad to hear its ok now

 

[poindexternasty]

My 02 threw a code like that.... not sure... might have been 0421 or 0420, i dont remember. Anyway, the problem ended up being the vapor cannister purge valve. Hope it helps.