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Home >> Geo >> 1990 >> Metro Base, 4D Hatchback, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes >> Code 13, Oxygen Sensor Circuit Open Circuit >> Engine Controls - Tests W/Codes >> Diagnostic Aids
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Diagnostic Aids

Normal O2 sensor voltage will vary from 0-.9 volt. Code 13 will be set if voltage is low or high all the time. If code is intermittent, see TESTS W/O CODES article.

Fig 1: Code 13 Circuit Diagram & Flow Chart
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