Sign | Probable cause | Method of elimination |
| Low compression in engine cylinders | The cylinder head gasket is blown | Replace the gasket |
| Piston rings are worn or damaged | Replace the rings | |
| The piston or cylinder is worn out | Repair or replace piston and/or cylinder block | |
| The valve seat is worn or damaged | Repair or replace valve seat and/or valve | |
| Low oil pressure | Low engine oil level | Check the engine oil level |
| The oil pressure sensor is faulty | Replace the oil pressure sensor | |
| The oil filter is dirty | Replace the oil filter | |
| Oil pump gears or cover are worn out | Replace the oil pump or cover | |
| Liquid motor oil | Change engine oil | |
| The safety valve is open | Repair the safety valve | |
| Increased clearances in bearings | Replace the bearing shells | |
| High oil pressure | The safety valve is closed | Repair the safety valve |
| Engine vibration | Engine mounts not tightened (front and back) | Tighten the engine mounts to the specified torque |
| The gearbox mounting bracket is not tightened | Tighten the gearbox mounting bracket to the specified torque | |
| The subframe bracket is not tightened | Tighten the subframe bracket to the specified torque | |
| The central support is not tightened | Tighten the center support to the specified torque | |
| The gearbox support is damaged | Replace the gearbox mount | |
| The engine subframe support is damaged | Replace the subframe support | |
| The support shaft is damaged | Replace the support shaft | |
| Valve noise | Liquid motor oil | Change engine oil |
| Worn or damaged valve stem or valve guide | Replace valves or valve guides | |
| The hydraulic valve clearance compensators are not working properly | Check oil supply passages or replace hydraulic valve clearance compensators | |
| Knocking in the connecting rod or main bearings of the crankshaft | Insufficient oil supply | Check the engine oil level |
| Liquid motor oil | Change engine oil | |
| Increased clearance in bearings | Replace the bearing shells | |
| Noise emitted by a toothed belt | Incorrect timing belt tension | Adjust the timing belt tension |
| Contamination of radiator tubes | Foreign inclusions in the coolant | Replace the coolant |
| Low coolant level | Coolant Leak: Hoses Corroded or Cracked (radiator hose, heater hose, etc.) | Replace or tighten the clamps |
| The radiator cap valve is faulty | Replace the radiator cap | |
| The thermostat housing is damaged | Replace the gasket or housing | |
| The radiator core is damaged | Replace | |
| The water pump or gasket is faulty | Replace the gasket or water pump | |
| High coolant temperature | Thermostat is faulty | Replace Thermostat |
| The radiator cap is faulty | Replace the radiator cap | |
| Clogged cooling system channels or hoses | Replace or clean clogged cooling system components | |
| The drive belt is loose or torn | Adjust tension or replace drive belt | |
| The water pump is faulty | Replace the water pump | |
| Coolant temperature sensor is faulty | Replace the coolant temperature sensor | |
| The electric radiator fan is faulty | Replace or repair the radiator fan | |
| Not enough coolant | Top up the coolant | |
| Low coolant temperature | Thermostat is faulty | Replace Thermostat |
| The coolant temperature sensor or its wiring is faulty | Replace the coolant temperature sensor | |
| Electric radiator fan not working | The coolant temperature sensor, fan motor, radiator fan relay, electrical wiring, or fuse is defective | Replace or repair damaged components |
| Exhaust gas leaks | The connections are loose | Tighten the connections |
| The pipe or muffler is damaged | Replace or repair the pipe or muffler | |
| Extraneous noise from the exhaust system | The partition in the muffler is damaged | Replace the muffler |
| The rubber support is damaged | Replace the rubber support | |
| The pipe or muffler is in contact with the body | Adjust the position of the exhaust system | |
| The pipe or muffler is damaged | Replace or repair the pipe or muffler |
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