Diagnosing P0171 and P0174 (lean) codes and mass airflow sensors using OBD II data @JustinMillerAutomotive
Diagnosing P0171 and P0174 (lean) codes and mass airflow sensors using OBD II data @JustinMillerAutomotive
Uploaded November 2017 | Updated September 2026, 3 weeks ago
This video explains how to use your OBD II data PIDs to identify the cause of a lean fuel condition. Using the data, you should never misdiagnose this type of problem.
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Justin Miller |

Diagnosing P0171 and P0174 (lean) codes and mass airflow sensors using OBD II data

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