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Old 11-03-2012, 07:02 PM   #1
UnleashedBeast
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Check Engine light - P2196 - Car idles rough

Hello everyone,

Today was a bad day for the Focus (6 speed auto, Titanium). I was in traffic, stopped, transmission in drive, foot on brake, AC on auto. When I went to take off, the car stumbled all over itself, and lurched forward hard, then weakened again. It was like I was pulsing the gas pedal. Then the engine died. I started it back up again, but.....

The check engine light came on. I managed to force the car home. It wasn't shifting right anymore and idle RPM was dancing all over the place between 500 and 1000. I knew something bad had happened.

When I got home, I was able to read the code "P2196". This car only has 5,800 miles on it, so I was scratching my head how I could already be getting an O2 sensor stuck rich code.

I decided to reset the PCM, but that only made the check engine light go away. The car drives terrible, has no power from a stop, and will not idle correctly all the time.

Anyone have a clue what happened? I can't locate a vacuum leak anywhere, I looked. I even unplugged the O2 sensor to make sure no connections were corroded.

Looks like it's going back to the Ford dealer.....and just when I was content with my car purchase. Looks like I may trade up after all. Tired of all the nit pick issues.....MFT, lack of power when needed, etc.

Anyone ever had this happen to such a new car?


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Old 11-04-2012, 04:35 PM   #2
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UPDATE:

Seems the issue was a problem with a custom air filter that was installed. It fell off of the MAF sensor housing and was causing turbulence in the air box. The MAF must have been sending weird messages (voltages) to the PCM. Car drives fine again.

I ordered a K&N E-2993 air filter as a proper replacement so I never have to deal with this again. Oiled cotten isn't my first choice in air filters for a car, but nothing is offered in Nano Fiber from Amsoil.
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Old 11-04-2012, 06:59 PM   #3
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Thanks for the update.

Good to hear it was an easy fix.

And yes, interference with the air-flow to a MAF sensor will cause problems. They are surprisingly sensitive.

Simply holding my finger in the middle of the MAF sensor opening while the engine is running on my silverado will trip up the computer.
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