Replace Ecm

Tester Connections

Specified Conditions

HA1A (A4-1) - HA1A (E4-1)

Below 1 Q

Standard Resistance (Check for short)

Tester Connections

Specified Conditions

HA1A (A4-1) or HA1A (E4-1) - Body ground

10 kQor higher

Tester Connections

Specified Conditions

+B (A4-2) - A/F HEATER relay (3)

Below 1 Q

Standard Resistance (Check for short)

Tester Connections

Specified Conditions

+B (A4-2) or A/F HEATER relay (3) - Body ground

10 kQor higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

DTC

PGG37

Oxygen Sensor Heater Control Circuit Low (Bank 1 Sensor 2)

DTC

PGG3B

Oxygen Sensor Heater Control Circuit High (Bank 1 Sensor 2)

HINT:

Sensor 2 refers to the sensor mounted behind the Three-Way Catalytic Converter (TWC) and located far from the engine assembly.

Do It Yourself Car Diagnosis

Do It Yourself Car Diagnosis

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