Unmetered air that enters the engine’s intake system can lead to lead mixture code. This lean code is enabled when the computer detects maxed out of enrichment adjustments.įirst and foremost, start by parking your vehicle on a flat ground and use an emergency brake set. If the reader shows P0174 then that means a lean engine error code has materialized in the system. When you see the ‘Check Engine Light’ is on, use you OBD II scanner to determine the error code. Exhaust leak of the first oxygen sensor and engine.A dirty filter resulting in low fuel pressure.Possible cracks or damage on the vacuum connection or PCV line.Downstream vacuum leaks of the Mass Air Flow sensor.Over oiled filters will cause the MAF to attract more dirt
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