A few months ago I had an issue with my 2011 5.0 where I was having a rough idle, cylinder 1 misfire and general poor performance. Turned out that the one 02 sensor was dead and the other was on the fritz. Took it to the dealership and had them repair it under warranty.
Car ran great immediately after. Definitely solved the problem. The only thing was that I was throwing P0420 and P0430 catalytic deficiency codes as I have high flow cats on. This week some anti-foulers were set to go on the rear sensors before getting bama to tune them off.
Fast forward till today when I go to start her. Right away i get a P0155 "02 Heater Circuit Bank 2, Sensor 1" code. From my lessons before I am guessing that this sensor is dead or inoperable. I was taking her in for some tires this week so I will be adding it to the list for the dealer to work.
BUT...my bigger question is why is this happening again so close to the recent replacement? Is there potentially something in my setup I should be looking for that might be a smoking gun to these things failing? Ford will be replacing this for me under warranty, but I do not really want my car in the shop every month.
- BBK long tube headers (no extensions installed)
- BBK 85mm Throttle Body
- K&N CAI
- Bama 87 Tune
I am fairly certain I do not have an exhaust leak, but I am not 100% sure how to check as those I've spoken to about it have given me varying methods. If y'all have some input on how to check I will glady do such thing.
Also, is there a way to check A/F with the SCT tuner? I've heard that a bad A/F will foul these H02S plugs out.
The car runs fine at the moment. No rough idle, smooth power through the gears and doesn't seem the have an effect on the MPG. This is probably since the remaining 02 sensor is picking up the slack...I just would hate to have to do the same thing I did 2 months ago again every few months.
Any help is appreciated...thanks guys