Cabrio GLX L4-2.0L (ABA) (2001)
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Remove protective cover -arrows- and separate 4 pin connector (black) to heated oxygen sensor (HO2S) before catalytic converter -G39-.
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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 ignition on and measure basic voltage.
Specification: 0.40 to 0.50 V
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Switch ignition off.
If the specification is not obtained:
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Check Oxygen sensor wiring.
If the specification is obtained:
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Replace heated oxygen sensor (HO2S) before catalytic converter -G39-.
Checking Oxygen sensor wiring
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Connect test box VAG 1598/22 to control module wiring harness.