Testing and Inspection: Oxygen Sensor Before Catalyst | Golf GL L4-20L (AZG) (2001)
-
Remove protective cover -arrows- and separate 4-pin connector (brown) to Oxygen sensor (O2S) behind three way catalytic converter (TWC)
-G130-.
-
Connect multimeter with aux. cables from VAG 1594 to measure voltage at contacts 3+4 (connector to Motronic control module).
-
Start engine and measure the basic voltage.
Specification: 0.40 to 0.50 V
-
Switch off ignition.
If the specification is not obtained:
-
Check Oxygen sensor wiring.
If the specification is obtained:
-
Replace Oxygen sensor (O2S) behind three way catalytic converter (TWC) -G130-.
-
Check DTC memory, if necessary, repair any faults and then erase DTC memory.
See: Powertrain Management/Computers and Control Systems/Testing and Inspection/Reading and Clearing Diagnostic Trouble Codes/Reading
Diagnostic Trouble Codes
See: Powertrain Management/Computers and Control Systems/Testing and Inspection/Reading and Clearing Diagnostic Trouble Codes/Clearing
Diagnostic Trouble Codes
Checking Oxygen sensor wiring, Oxygen sensor 2
-
Remove wiper arms and cowl panel.