Vehicles using B204i engine list:

Engine B204i

Symptoms:
- Rough idling and hesitation during acceleration
- Engine misfires or stalling
- Reduced power and poor fuel economy
- Check engine light illumination
- Oil leaks around the valve cover gasket area

Diagnosis:
- Inspect ignition components such as spark plugs, wires, and coils for wear or damage
- Check for vacuum leaks in hoses and intake manifold gaskets
- Perform compression test to assess cylinder health
- Scan for fault codes related to fuel injection or ignition timing
- Examine valve cover gasket and seals for oil leakage

Fixes:
- Replace worn spark plugs and ignition wires to restore proper firing
- Repair or replace cracked or leaking vacuum hoses and intake gaskets
- Replace valve cover gasket to stop oil leaks and prevent contamination
- Clean or replace fuel injectors to ensure proper fuel delivery
- Adjust or replace faulty sensors affecting ignition timing or fuel mixture
- Perform routine oil changes with correct grade to maintain engine lubrication

Prevention:
- Follow recommended maintenance schedule for spark plugs, filters, and fluids
- Regularly inspect vacuum lines and gaskets for signs of wear or cracking
- Use quality fuel and oil to reduce deposits and wear
- Avoid prolonged idling and aggressive driving to reduce engine stress
- Monitor engine performance and address warning signs promptly to prevent damage