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Home >> Alfa Romeo >> 2019 >> Giulia Base, AWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 9 (2.9L Pcm 1 - DTCS P0118-00 To P0350-00) >> Diagnosis And Testing >> P0135-00-O2 Sensor 1/1 Heater Performance >> Possible Causes

Possible Causes

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Possible Causes
ASD RELAY OUTPUT CIRCUIT OPEN/HIGH RESISTANCE
HIGH RESISTANCE IN THE O2 SENSOR 1/1 HEATER CONTROL CIRCUIT
O2 SENSOR 1/1
POWERTRAIN CONTROL MODULE 1 (PCM-1)

Always perform the PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE before proceeding. Refer to  PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE  .