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1999 Ford Ranger P0171 OBD2 Code: Causes and Solutions After MAF and Fuel Pump Replacement

Model: 1999 Ford Ranger Fault Code: P0171 Posted: 2022-07-07 14:25

I recently received a diagnostic code P0171 on my 1999 Ford Ranger with a 4-cylinder engine. The vehicle has less than 60-000 miles on the odometer. I have already replaced both the Mass Airflow (MAF) sensor and the fuel pump, but the P0171 code persists. What other potential causes could be responsible for this issue? Are there any common troubleshooting steps I should consider?

Related fault codes
P0171
Comments (2)
Anonymous 2022-07-08 18:25

If the P0171 code is triggered specifically at idle, a vacuum leak is a likely culprit. Check all hoses and connections around the intake manifold and throttle body for cracks or disconnections.

Anonymous 2022-07-09 08:35

Thanks for the insight — I'll inspect the vacuum lines and check for any signs of leaks at idle conditions.