Jetta GLS L4-1.8L Turbo (AWD) (2001)
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Connect multimeter with auxiliary cables from VAG 1594 to measure voltage at contacts 3 + 4 (connector to engine control module).
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Switch on ignition and measure basic voltage.
Specification: 0.40 - 0.50 V
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Switch off ignition.
If the specification is not obtained:
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Check Oxygen sensor wiring
If the specification is obtained:
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Replace Oxygen sensor before catalyst (G39).
Checking Oxygen sensor wiring
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Connect test box VAG 1598/31 to control module wiring harness. The engine control module remains disconnected.