Cabrio GLX L4-2.0L (ABA) (2001)
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Check probe heating for continuity at Oxygen sensor connector contacts 1 and 2.
If it is determined that probe heating has an open circuit:
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Replace Oxygen Sensor (O2S) behind three way catalytic converter (TWC) -G130-.
If probe heating has continuity:
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Set multimeter to measure voltage and connect to contacts 1 and 2 on connector to control module.
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Start engine and run at idle speed.
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Measure voltage supply. When display group 41, display zone 4 displays:
Display, Htg.aC.ON:
Specification: 11.0 to 14.5 V
Display, Htg. aC.ON/Htg.aC.OFF (alternating)
Specification: Between 0.0 to 12.0 V fluctuating switch ignition off.
If no voltage is present:
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Connect test box VAG 1598/22 to control module wiring harness.