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Home >> Toyota >> 1988 >> 4Runner Base, Standard >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Computer Control System >> Diagnostic Charts >> Code 52, 53 (Code 12, 13 On Turbo)
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Code 52, 53 (Code 12, 13 On Turbo)

Open or short in Knock Sensor (KNK) or knock control in ECU faulty.

NOTE: No further information available from manufacturer.