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Home >> Chrysler >> 1984 >> E Class 2.2 D >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> 2.2L Non-Turbo TBI Tests >> Testing & Diagnosis Preliminary Checks >> Trouble Code Identification >> Code 21
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Code 21

Problem with O2 Sensor feedback circuit. Occurs if engine temperature is greater than 170°F (77°C), engine speed is greater than 1500 RPM, and there is no O2 sensor no signal for more than 5 seconds.

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