A4 Sedan V6-2.8L (AFC) (1996)
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Switch multimeter (Fluke 83 or equivalent) to measure resistance (ohms) and connect between between terminals 1 and 2.
Specified value at room temperature: approx. 2 to 5 ohms
NOTE: With small increases in temperature, resistance will increase sharply.
If the specified value is not obtained:
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Replace heated oxygen sensor.