Vehicles using M133.980 engine list:

Engine M133.980

Symptoms:
- Loss of power or reduced engine performance
- Unusual knocking or rattling noises from the engine
- Check Engine Light (CEL) illumination
- Increased oil consumption or visible oil leaks
- Rough idling or stalling under load

Diagnosis:
- Inspect for timing chain wear or elongation, a known weak point in M133 engines
- Check turbocharger operation for signs of failure or boost leaks
- Perform compression and leak-down tests to assess cylinder health
- Scan for fault codes related to misfires, camshaft position sensors, or turbocharger faults
- Examine oil quality and level; poor maintenance can accelerate wear

Fixes:
- Replace timing chain and associated tensioners/guides if wear or slack is detected to prevent catastrophic failure
- Repair or replace faulty turbocharger components; clean or replace intercooler hoses to eliminate boost leaks
- Address oil leaks by replacing gaskets or seals, especially around valve covers and oil cooler
- Perform regular oil and filter changes using manufacturer-recommended synthetic oils to maintain lubrication quality
- Update engine software if available to improve performance and reliability

Prevention:
- Adhere strictly to Mercedes-Benz recommended service intervals, particularly oil changes with high-quality synthetic oil
- Monitor engine oil level frequently to avoid running low, which can damage the timing chain and turbocharger
- Avoid aggressive driving when the engine is cold to reduce stress on components
- Use only OEM or high-quality replacement parts during repairs to ensure durability
- Regularly inspect and maintain the cooling system to prevent overheating, which can exacerbate engine wear

By focusing on timely maintenance and addressing early symptoms, owners of vehicles equipped with the M133.980 engine can minimize common issues and extend engine life.