Vehicles using M112.921 engine list:

Engine M112.921

Symptoms:
- Rough idling and misfires
- Oil leaks around valve covers and intake manifold
- Engine overheating or coolant loss
- Check engine light illumination with related fault codes
- Reduced engine performance or hesitation

Diagnosis:
- Inspect spark plugs and ignition coils for wear or failure causing misfires
- Check valve cover gaskets and intake manifold gaskets for oil leaks
- Pressure test cooling system to identify leaks or thermostat malfunction
- Scan ECU for fault codes related to ignition, fuel, or sensors
- Examine timing chain tensioners and guides for wear or noise

Fixes:
- Replace worn spark plugs and faulty ignition coils to restore smooth running
- Renew valve cover and intake manifold gaskets to stop oil leaks
- Repair or replace leaking hoses, thermostat, or radiator components to resolve overheating
- Clean or replace mass airflow sensor and oxygen sensors if faulty
- Replace timing chain tensioners and guides if excessive noise or slack is detected

Prevention:
- Follow regular maintenance schedule including timely spark plug and ignition component replacement
- Use recommended engine oil and change it at specified intervals to protect seals and gaskets
- Monitor coolant levels and condition, flushing cooling system as advised
- Avoid prolonged idling and aggressive driving to reduce engine stress
- Periodically inspect engine bay for early signs of leaks or wear to address issues promptly

-NO INFO-