Question about Ford F-450
Fix the misfire concern on cylinders 5 and 6. That will probably take care of the lean codes p0171 and p0174. The catalytic converter is probably damaged from the misfire concern....that's what is setting the p0420 code. Take care of these concerns first before fixing p1131 code
Posted on Jan 15, 2013
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Posted on Jan 02, 2017
it is down under the intake manifold. the intake manifold must be removed to get to it. this vehicle is known for developing a vacum leak in the elbow hose that connects to pcv valve, so ive done a few.
Posted on Feb 19, 2009
P0174 means Fuel Trim too Lean (Bank 2)
P0401 means Exhaust Gas Recirculation Flow Insufficient Detected
P0420 means Catalyst System Efficiency Below Threshold (Bank 1)
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Posted on Sep 28, 2009
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