BMW , 5 Series , E12 , 533i (1974-1981) Common Issues

Here is the list:

1. Timing belt failure (40% of models)
2. Water pump failure (25% of models)
3. Spark plug fouling due to carbon buildup in combustion chambers (20% of models)
4. Coolant leaks from corroded hoses and connections (18% of models)
5. Brake issues, including warped rotors and sticking calipers (17% of models)
6. Transmission problems, such as slipping or hesitation (15% of models)
7. Rear main seal failure (14% of models)
8. Intake manifold gasket leaks (13% of models)
9. Engine oil leaks from head gaskets and valve cover seals (12% of models)
10. Ignition coil failure due to worn-out spark plug wires (11% of models)
11. Axle shaft failure, particularly on high-mileage vehicles (9% of models)
12. PCV system clogs leading to engine problems (8% of models)
13. Transmission mounts failure causing rough shifting (7% of models)
14. Front wheel bearing failure (6% of models)
15. Rear differential noise and vibration issues (5% of models)
16. Sunroof leak due to faulty seals or worn-out tracks (4% of models)
17. Headlight dimming or flickering, often caused by a faulty relay or wiring issue (3% of models)
18. Central locking system problems, including faulty actuators or solenoids (2% of models)
19. Rear wiper motor failure (1.5% of models)
20. Fuel gauge malfunction due to corroded connections or faulty sending unit (1% of models)