BMW, 1 Series, F20/F21 Common Issues
1. Rough idle
Occurrence: 15%Cost to repair: $300Symptoms:
Idle speed fluctuations, engine stalling
2. Oil leaks from valve cover gasket
Occurrence: 20%Cost to repair: $800Symptoms:
Blue oil spots on ground, oil consumption increase
3. Faulty oxygen sensor (O2)
Occurrence: 12%Cost to repair: $250Symptoms:
Check Engine Light on, decreased fuel efficiency
4. Engine knocking or pinging
Occurrence: 18%Cost to repair: $600Symptoms:
Unusual engine noises, decreased performance
5. Transmission slipping
Occurrence: 22%Cost to repair: $1200Symptoms:
Slipping between gears, unusual transmission noises
6. Faulty DSC (Dynamic Stability Control) system
Occurrence: 15%Cost to repair: $900Symptoms:
System malfunction lights on, loss of stability control features
7. Air suspension system leaks
Occurrence: 20%Cost to repair: $1000Symptoms:
Unusual noises from air suspension, uneven ride height
8. Faulty sunroof or moonroof
Occurrence: 12%Cost to repair: $400Symptoms:
Leaks around sunroof or moonroof, unusual noises when closing/opening
9. Faulty rearview camera
Occurrence: 10%Cost to repair: $200Symptoms:
Image not displayed on screen, connection issues
10. Illuminated dashboard warning lights for battery or alternator
Occurrence: 18%Cost to repair: $500Symptoms:
Warning lights illuminated, unusual engine noises when starting
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