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I've had an occasional issue where I start the car, and have a surging idle, combined with a dead accelerator pedal. After a restart or two, the car would run fine. When this happened I got a check engine light with an accelerator pedal code. I ran the checks on the accelerator pedal, and it was fine.
My MBII was also getting an unknown code P201f-000. Most p201f codes have -b40 after, related to engine oil sensor. I found one search hit that had the p201f as the intake air sensor.
After a lot of searching, I came across a post on a forum (wish I'd saved it), where someone was chasing a similar problem. Multiple garage visits and a lot of money were spent before the intake air sensor was found to be the culprit. I took mine out, and it looked like someone beat it up (pic below; I hate to think where the missing pieces went). Replaced it, and code goes away. Just passing this on.
I think you're right. Replacing the sensor did clear the P201f error, but from what I could find, the problems of dead accelerator pedal and wavering idle seem to be either throttle body related, or related to the wiring harness.
12-27-2020, 02:12 PM
