Code 12 Engine revolution signal missing
Code 52 Knock sensor fault
Code 71 EGR system malfunction
CODE 12 - IS RPM SIGNAL POSSIBLE CAUSE DISTRIBUTOR OR CIRCUIT ECU. CODE 52 - IS KNOCK SENSOR SIGNAL POSSIBLE CAUSE KNOCK SENSOR OR CIRCUIT ECU. CODE 71 - IS EGR SYSTEM MALFUNCTION POSSIBLE CAUSE EGR SYSTEM EGR TEMP SENSOR.
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