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Home >> Ford >> 2023 >> Mustang Mach 1, Automatic Trans >> Repair and Diagnosis >> Engine Performance >> Fuel Delivery >> Fuel Charging And Controls - 5.0L 32V Ti-VCT (359KW 486PS) (WU) 5.0L Ti-VCT V8 (343KW 466PS) (MF) - Mustang >> Diagnosis And Testing >> Air/Fuel Ratio >> Global Customer Symptom Code (GCSC) Chart

Global Customer Symptom Code (GCSC) Chart

Diagnostics in this Service Information assume a certain skill level and knowledge of Ford-specific diagnostic practices. REFER to: Diagnostic Methods .

Symptom Action
Start/Run/Move > Running > Failed Emissions Testing > HEGO GO to Pinpoint Test DZ 
Start/Run/Move > Running > Failed Emissions Testing > HEGO GO to Pinpoint Test H 
Driving Performance > Runs Rough > All Running Modes > Always GO to Pinpoint Test H 
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