Automotive Servicing NC III Practice Questions - TESDA Automotive Servicing NC III Competency Assessment Exam

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A vehicle retrieves Diagnostic Trouble Code (DTC) P0171 (System Too Lean - Bank 1). The technician notes that the Short-Term Fuel Trim (STFT) is +18% at idle, but decreases to +2% at 2,500 RPM. What is the most likely cause of this condition?

A fuel pump with low volume output or restricted fuel filter A vacuum leak in the intake manifold downstream of the MAF sensor A faulty Mass Air Flow (MAF) sensor reporting high airflow at all speeds One or more fuel injectors stuck open or leaking fuel

Correct Answer:

A vacuum leak in the intake manifold downstream of the MAF sensor

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