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Home >> Porsche >> 2003 >> 911 Carrera 4S, Standard >> Repair and Diagnosis >> Heating, Ventilation & A/C (HVAC) >> HVAC Control Systems >> Heater, Diagnosis - 911 CARRERA (996) >> System H 01 >> Fault overview >> Test point 2 >> Fault code 21

Fault code 21

Outside temperature sensor Open circuit Short to ground

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