Finally!!! engine light comes on
 

Been waiting 3-4 months on it. Car been running fine but never seemed to be running perfect at wot and gas miles have been sub 16 till this week when they went to 12-13mpg over last 2 tanks. Code p0151 b2s1 kow voltage, one of the wideband sensors. Goes to shop on Monday to get fixed. And hopefully be running like it did when i first got it. Like a bat outta hell.
Question I have though is Ford won't give me any problems fixing it even though the car is tuned will they? Wouldn't think an o2 sensor going bad would be caused by a tune and should be covered under warranty. Car has 21k on it.

They shouldn't give you any issues. An 02 sensor failure is independent of a tune. It's not like you modified your exahust (well the catalytic area anyway) that they could point the finger at it.

Don't let them intimidate you, IF they try.

I didn't think they should. But thanks for the reassurance guys. And Rick u def know they won't intimidate me. I work at a dealer and used to write service so they will def be fixing it. Plus I used to work with the advisor that I deal with where I take her. So should be good. Also he won't let them download anything to the ecu bc he knows its tuned. Plus I'm putting a sign in the car.

Then you're set!

o2 sensors rarely fail, especially on such a new car. Hopefully it is just that, a bad o2.

I don't think it's an out right problem of the o2 sensors failing but rather there seems to be some that are too slow in responding to ecm. From what I've gathered from these forums and others is that the ecm in the 11-13 stangs are very sensitive to any fluctuations of data imput from the various sensors, particularly the 02 sensors. If the O2 sensors are even a few milli seconds slow in responding to the ecm it's enough to throw a CEL. The tricky part is if you test the O2 sensors independently they will test out ok. This is what was happening in my 11 GT(CEL came on 3 separate times). The techs were stumped. I gathered info from some of the forum threads and presented it to the service manager. They swapped out the O2 sensors. No more CEL.

Go figure. Light went off earlier and ain't been on since. Oh well. At least I didn't clear the code.

TSB 11-7-7 States that an aftermarket PCM calibration - non factory modification or aftermarket components on a 2011-13 mustang can void the powertrain warranty

Can =\= will. They must show cause.

Only way to have warranty voided is blow the motor. Ford will pay to fix almost everything else esp an o2 sensor that a tune doesn't do anything too. Light back on this morning and been on all day.

Usually O2 sensor CELs are related to tuning issues. Sometimes they go bad but usually it had something to do with tune the car has loaded on it.

Best of luck to you at Ford.

Thanks. But even if Ford for some odd reason doesn't cover it I work at a dealer and can get the sensor for $65 instead of +$100 thru Ford. I don't think I will have a problem with Ford and I'm leaving the steeda cai and tune on the car when I take it in Monday. Ive known the advisor I deal with for 15yrs and the dealer is ok with the mods I've done. Ie understands that unless I blow the motor everything else is covered by Ford under the warranty. If I blow the motor they can't over look that and try and cover it anyway. That's on me. But a sensor going bad isn't costing ford a bundle to fix. Ford just doesn't want to spring for new motors on tuned cars. I'll def be keeping this thread up to date with what all happens with thos issue and if ford covered it or not.

Lawyer speak for Prove it!

Agreed. ALMOST ALWAYS any modification, especially something like a tune, will be grounds for them to void your warranty.

Not true. A warranty can be voided before a blow engine because they designed the car with specs A and now they have user loaded specs B, they can and almost always will argue that the cause of all or any issue is the unapproved modification.

You have to prove the tune didn't cause the issue as much as they have to prove it did.

As before, good luck.