P0171 1997 Ford F150 -

Question

displays po171 po401 p1131 need to find the problem

Answer 1

HI there

P0171 indicates a lean fuel mixture. This can be caused by several things including a leaking intake manifold gasket, low fuel pressure and a fautly O2 sensor. The P1131 is a code for a problem with the rear O2 sensor. Repairing the P0171 could resolve the issue with the rear sensor.

P0171 FORD - Fuel Injection System Too Lean Bank 1

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