S4 Sedan L5-2226cc 2.22L DOHC Turbo (AAN) (1992)
Heated Oxygen Sensor: Service and Repair
REMOVING
Heated Oxygen Sensor Connector
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Disconnect both Heated Oxygen Sensor (HO2S) harness connectors.
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Location: right rear of engine compartment.
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Cut tie wraps.
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Remove HO2S sensor (front exhaust pipe near turbocharger).
INSTALLING
Note:
Install in the reverse order of removal, noting the following:
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Tighten to specifications:
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Torque to 5O Nm (37 ft lb).
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Reposition tie wraps carefully, avoiding contact between sensor wiring and exhaust pipe.
CAUTION:
The threads of the HO2S sensor MUST be coated with an anti-seize compound. Take care that this compound does NOT enter the slits of the
HO2S probe.