Question about 1990 Ford F350
My code anylizer says
PO171 = System too lean (Bank 1)
PO302 = Cylinder 2 misfire detected
PO304 = Cylinder 4 misfire detected
PO308 = Cylinder 8 Misfire detected
What can I try
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Posted on Jan 02, 2017
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Mar 12, 2014 | 1999 Ford Explorer
PO171 OBD2 Code basically this means that an oxygen sensor in bank 1 has detected a lean condition (too much oxygen in the exhaust). On V6/V8/V10 engines, Bank 1 is the side of the engine that has cylinder #1. The P0171 is one of the more common trouble codes.
his code is triggered by the first downstream (front) O2 sensor. The sensor provides a reading of the air:fuel ratio leaving the engine's cylinders, and the vehicles powertrain/engine control module (PCM/ECM) uses that reading and adjusts to keep the engine running at that optimum ratio of 14.7:1. If something is not right and the PCM cannot maintain the 14.7:1 ratio, but rather there is too much air, it triggers this code.
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