205: Infiniti Q50 Dual Throttle Lean Condition
About this episode
A deep dive into diagnosing a 2015 Infiniti Q50 with persistent lean codes on both banks. The host walks through extensive testing including fuel pressure, vacuum leaks, sensor data, and the unique dual throttle and dual mass airflow sensor setup. Despite initial confusion over a non-functional MAP sensor and dirty air filters, the breakthrough came from replacing both mass airflow sensors, which restored proper fuel trims and improved performance. The episode highlights the challenges of diagnosing complex systems, the importance of known good data, and practical tips like loading the engine to detect vacuum leaks and conducting VE tests.
On this episode I go through the diagnosis of a 2015 Infiniti Q50, 3.7L V6, with a P0171 and P0174, lean condition. I'll share my thought process through the diagnostic steps tracking down the source of the positive fuel trims. My goal on this show is to share vehicle diagnostics that challenge me to come to a precise conclusion, this vehicle being one. I have a gut feeling I know the solution, but not enough data to condemn a part.
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Infiniti Q50
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