90 Quattro 20V (Canada) L5-2309cc 2.3L DOHC (7A) (1989)
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Oxygen Sensor: Service and Repair
To maintain the proper functioning of the engine management system, the oxygen sensor must be replaced every 60,000 mi. (96,500 km).
The warning light in the instrument cluster will only light if a malfunction is detected, and does not need to be reset.
