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California Models

DIAGNOSTIC PROCEDURE





1. Are there any other codes besides 21 or 28 being output?
- If YES proceed to relevant Diagnostic Trouble Code chart.
- If NO replace Main Heated Oxygen Sensor.

NOTE: If Diagnostic Trouble Code "21" is output inspect / replace front Main Oxygen Sensor. If Diagnostic Trouble Code "28" is output, inspect / replace rear Main Oxygen Sensor.
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