BMW 2.0

The DISA variable intake valve breaks at the pivot base or the membrane tears. Fragments can be sucked into the engine and cause total damage.

Symptoms: Power loss in the lower rev range, rattling or clattering from the intake area, in the worst case engine damage from ingested fragments.

The electric coolant thermostat from Behr/Mahle fails prematurely. BMW recommends only original thermostats. Failure leads to overheating or permanently cold running.

Symptoms: Engine fails to reach operating temperature or overheats, heater works poorly, increased fuel consumption with permanently cold running.

The plastic thermostat housing of the M52B20 warps through thermal stress. Coolant loss at the housing is a known wear pattern at mileages above 120,000 km.

Symptoms: Coolant patch under the car, engine warms up poorly or overheats, coolant level drops without visible leaks at hoses

The differential pressure valve of the crankcase ventilation tears or sticks, the drain hose blocks. Oil enters the intake, the mixture deteriorates, oil consumption rises.

Symptoms: Oil film in air filter housing, rough idle, slight oil consumption, oil smell in cabin with engine off

The fabric hood tears from years of folding and UV exposure and becomes leaky. Door seals also fail with age. The plastic rear window turns cloudy or develops folds.

Control arms, tie rod ends and ball joints on the front axle wear with higher mileage and are flagged at inspection. Typical issue on all E36-based vehicles.

The barrel bearings at the Z3 rear axle wear at higher mileage and must be replaced. An inexpensive repair that causes no consequential damage if done in time.

The VANOS unit on the six-cylinder engines (M52, M54) is prone to leaks and malfunctions. Worn seals and seized pistons in the VANOS system cause power loss and rough running.