A8L Quattro Sedan W12-6.0L (BSB) (2005)
sensor test results.
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End diagnosis and switch ignition off.
If specifications are not obtained:
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Check oxygen sensor wires to control module according to wiring diagram.
Checking oxygen sensor wires to control module
Cylinder bank 1
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Connect test box to Engine Control Module (ECM) (J623) wiring harness on connecting test box for wiring test,
Cylinder bank 2
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Connect test box to Engine Control Module (ECM) 2 (J624) wiring harness on connecting test box for wiring test,
Cylinder bank 1 and 2
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Disconnect corresponding 6-pin harness connector to oxygen sensor to be tested: Component location refer to Repair Manual.
‹› Cylinder bank 1 with cylinders 1 through 6 is located at right in direction of travel.
‹› Cylinder bank 2 with cylinders 7 through 12 is located at left in direction of travel.
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Check wires between test box and 4-pin connector to Engine Control Module for open circuit according to wiring diagram. Wiring resistance:
max. 1.5 ohms
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Check wires for short circuit to B+ and Ground (GND). Specification: infinite ohms
If no malfunction is detected in the wiring:
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Replace respective oxygen sensor: