while I had no codes indicating a bad MAF sensor on my recently purchased 2008 Crown Vic, it had some driveability/performance/transmission shifting issues and on a whim I decided to take the (same part number) MAF sensor out of my 2010 Escape and install it in the Vic. Got super lucky they happened to use the exact same part even though they were different models. Anyway, replacing the MAF sensor immediately made the car run and drive a lot better.
Pros: improved driveability, better performance, better shifting
Vehicle:
Ford Crown Victoria
