IsItAGoodCar
Reliability Guide

Common Problems with the
2006 BMW Z4 (E85/E86)

The 2006 LCI facelift brought N52 engines, the fixed-roof E86 coupé and the S54-powered Z4 M. UK coupés are rare, and the 3.0si Coupé is now the most collectable non-M car of this generation.

What changed for 2006

  • •N52 2.5i, 2.5si and 3.0si replace the M54 sixes
  • •E86 coupé launched with 3.0si and M versions, six-speed manual or automatic
  • •Z4 M Roadster and Coupé with the 343PS S54 engine and hydraulic steering
  • •Revised headlights, bumpers, tail lights and six-speed automatic option

Common MOT watch-outs

  • !Sticky electric steering column on pre-2006 cars
  • !Roof motor water damage from blocked drains
  • !Cracked rear coil springs and worn rear shock mounts
4
Known Issues
1
Serious
3
Moderate
0
Minor

All Known Issues

Roof Motor Water Damage

SeriousBodywork & Rust

The electric roof motor is located in a drainage cavity that blocks with leaves and debris. The motor eventually sits in a pool of water and rusts solid.

Est. Repair Cost: £400–£800
Warning Signs:

Roof refusing to move when the button is pressed, Motor making a faint "struggling" sound but no movement, Manual release must be used to move the roof

What to Inspect:
  • Ask if the motor has been "relocated to the boot", which is the permanent fix
  • Check the drainage holes in the roof storage compartment for blockages
  • Test the roof operation several times in quick succession
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Sticky Steering (EPS Column)

ModerateSteering

The grease in the electric power steering column can dry out or the components expand with heat, causing the steering to feel "sticky" or notchy on center.

Est. Repair Cost: £500–£1,000
Warning Signs:

Steering feels "stuck" when driving straight at motorway speeds, Small steering corrections feel notchy or require more force than normal, Problem gets worse as the cabin/engine bay warms up

What to Inspect:
  • Take the car for a long test drive to get it fully warm
  • Check for steering wheel corrections that feel inconsistent or lack "flow"
  • Ask if the steering column has been adjusted or replaced
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Rear Coil Springs Snapping

ModerateSuspension & Chassis

The brittle rear springs often snap at the very bottom coil due to the car's weight distribution and UK potholes. It can be hard to spot without inspection.

Est. Repair Cost: £150–£300
Warning Signs:

Metallic pinging noise from the rear, One corner of the car sitting slightly lower than the other, Knocking over speed bumps

What to Inspect:
  • Shine a torch into the rear wheel arch and inspect the bottom coil of the spring
  • Check both sides, as they are usually replaced in pairs
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DISA Valve Rattle (M54 Engine)

ModerateEngine

The flap inside the intake manifold (DISA valve) can work loose. If the metal pin falls out, it can be ingested by the engine, causing total failure.

Est. Repair Cost: £100–£250
Warning Signs:

Tapping or rattling noise from the intake side of the engine, Loss of low-end torque, Rough idling

What to Inspect:
  • Listen for a rattle from the black box on the side of the intake manifold
  • Unplug the DISA electrical connector while running to see if the rattle stops
  • Ask if an aluminium upgrade kit has been fitted
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Buying Tips for 2006 BMW Z4 (E85/E86)

  • Verify a coupé is a genuine E86 by the fixed roof and boot shape
  • On an M, check for boot floor cracks and a full BMW service history
  • Test the roof motor after leaving the car out in heavy rain
20052007–2008
Check a 2006 BMW Z4 (E85/E86) by Registration