ENGINE DTC DESCRIPTION CAUSE DIAGNOSTIC LAMP (MIL) DIAGNOSTIC LAMP (CEL) Gil When Driven In CNG PROBABLE TROUBLE AREA P0300 Random Misfire Any one cylinder misfiring, But cylinder detection not done. - - - 1) Loose /Damaged Connections. 2) Faulty IGN System (spark plugs, ht cables, connections etc.) 3) Faulty/ Clogged INJECTORS. 4) Low COMPRESSION PRESSURE. 5) Improper VALVE CLEARANCE 6) Improper VALVE TIMING.s 7) Faulty ECT SENSOR. 8) Loose Connector/ Faulty ECU. 1) When misfire percentage is more than a calibrated OBD emission threshold ON OFF Special Case 2)When the misfire percentage is more than the catalyst damaging index ON Blinking OFF Special Case P0301 Cylinder 1 Misfire Mis-fire fault, cylinder 1 - - - 1) Loose /Damaged Connections. 2) Faulty IGN System (spark plugs, ht cables, connections etc.) 3) Faulty/ Clogged INJECTORS. 4) Low COMPRESSION PRESSURE. 5) Improper VALVE CLEARANCE 6) Improper VALVE TIMING.s 7) Faulty ECT SENSOR. 8) Loose Connector/ Faulty ECU. 1) When misfire percentage is more than a calibrated OBD emission threshold ON OFF Special Case 2)When the misfire percentage e is more than the catalyst damaging index ON Blinking OFF Special Case P0302 Cylinder 2 Misfire Mis-fire fault, cylinder 1 - - - 1) Loose /Damaged Connections. 2) Faulty IGN System (spark plugs, ht cables, connections etc.) 3) Faulty/ Clogged INJECTORS. 4) Low COMPRESSION PRESSURE. 5) Improper VALVE CLEARANCE 6) Improper VALVE TIMING.s 7) Faulty ECT SENSOR. 8) Loose Connector/ Faulty ECU. 1) When misfire percentage is more than a calibrated OBD emission threshold ON Blinking OFF Special Case 2)When the misfire percentage is more than the catalyst damaging index ON Blinking OFF Special Case
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