What causes the Audi Q5 system to run lean at idle?
1 Answers
Audi Q5 system running lean at idle reasons: Air leaks after the mass air flow (MAF) sensor, PCV system leaks, faulty oxygen sensor, exhaust leaks near the oxygen sensor, EGR leaks, dirty mass air flow (MAF) sensor, clogged fuel injectors, insufficient fuel supply from the fuel pump, etc. Symptom manifestations: Intake system air leaks, insufficient fuel pressure, poor cylinder performance, inaccurate air flow meter data, damaged fuel injectors, malfunctioning ignition system, etc. Fault range: The fault range involves fuel, air, or emission control. An excessively rich air-fuel ratio indicates excessive fuel delivery, while an excessively lean air-fuel ratio indicates insufficient fuel delivery. A system running too lean means the fuel quantity (relative to air intake) is too low.