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Home >> Infiniti >> 2003 >> QX4 RWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Diagnostic Tests >> DTC P0121: Throttle Position Sensor - Range/Performance Problem >> Fail Safe Mode
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Fail Safe Mode

When malfunction is detected, ECM enters fail safe mode. Throttle position will be determined based on the injected fuel amount and engine speed. When in fail safe mode acceleration will be poor.