Skip to content

BMW 3 Series (E46)

BMW · 3-SERIES · E46

Verified1 source
1 source
  • Editorial sourceeditorial

Reliability snapshot

The E46 (1998–2006) is one of the most popular 3 Series generations and is generally robust, but it has one widely documented weak point: cracking of the rear subframe mounting points in the floor, especially on harder-driven or high-mileage cars. Inspecting and, if needed, reinforcing this area is a well-known part of E46 ownership. Other common items are the same brittle plastic cooling components as earlier cars, single-VANOS rattle on six-cylinder engines, window-regulator failures, and the oil-filter-housing gasket. Addressed proactively, the E46 remains a durable and rewarding car.

Top problems on the E46

Most expensive and most frequently reported issues — ordered by repair cost

  • Caution — monitor closelyAgeing plastic cooling components
  • Safe to drive short-termWindow-regulator failures
  • Avoid long tripsRear subframe mounting-point cracks

Engines and trims

E46 production variants

2.2–3.0L petrol (M54)
2.0L diesel (M47)
M54 2.2–3.0 inline-6
2.2–3.0L I6
Naturally aspirated inline-six with single VANOS.
3.0L diesel (M57)
N46 1.8–2.0 inline-4
1.8–2.0L I4
Naturally aspirated four-cylinder with Valvetronic.
2.0–2.8L petrol (M52)
1.8–2.0L petrol (N42)
1.6–1.9L petrol (M43)

Maintenance overview

Key service intervals (varies by engine and driving conditions)

Service itemIntervalTypical cost
Rear subframe inspection
At purchase, and periodically on high-mileage cars
Engine oil and filter
Per BMW's Condition Based Service schedule
12,000–15,000 km
Cooling-system refresh
Preventive — or sooner by vehicle age
120,000–150,000 km
Was this page helpful?