Ford Repair Questions? Ask a Mechanic for Answers ASAP
Helo the 171 and 174 are lean odes, this can be caused by a vacuum leak, loss of fuel pressure or issue with the mass airflow sensor. Inspect for vacuum leaks. Which the P0133 also indicates a possible vacuum leak. Check the pcv valve and hose at the back of the intake for being collapsed and sucking in air. The P0402 & P0401 are an EGR valve code. This is probably due to a failed DPFE sensor for the egr valve which is very common.
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