Re: 2003 4Cyl Trouble code P-0172
1) Check airflow. Start by making sure your air intake is cleared. Then check the filter to make sure it isn't clogged. Next, clean your MAF sensor.
2) Check for vacuum leaks.
3) Get a fuel pressure gauge and check your fuel pressure.
Basically, the problem here is that the engine is either getting too much fuel, or not enough air. It's far more likely to be not enough air though. Definitely check the filter and clean the MAF sensor, at least.
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2003 Ford Ranger XLT
2.3L I4 Duratec DOHC, 5R44E 5-speed auto, RWD, 7.5" Open w/ 4.10 Ratio, Gibson split-rear catback
Sonic Blue Pearl with dark gray trim
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