What is your question?
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What is your question?
My check engine light is on. I went to auto-zone and they retrieved two codes (P0171 & P0174). I changed the mass air flow sensor and drove approx. 160 miles and the light came back on. I also noticed pinging when the engine is warm.
1 Reply
It's a lean mixture code. Could be caused by different things, too much unmeasured air or not enough fuel. First I'd check the fuel pressure, then the intake hoses, the intake and exhaust manifold for air leaks. Usually it requires a smoke pump to safely check for leaks. Dirty injectors could be also a source. Zee