Auto-Union OBD Trouble Code 21

Auto-Union Problems For OBD Code 21

No ignition reference

Oxygen sensor signal doesn't change (stays at 4.3-4.5V)Probably bad oxygen sensor

throttle position sensor or circuit - voltage high

Fuel tune select

Oxygen sensor reporting too lean or too rich after 2 – 12 minutes with temp over 170° and RPM above 1500

Check 21 OBD1 Code For All Auto-Union Models

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