IsItAGoodCar
Reliability Guide

Common Problems with the
2018 MINI Convertible (F57)

The facelift brought updated lighting and infotainment, making later F57s feel the most modern and easiest to recommend.

What changed for 2018

  • •LCI update with refreshed tech and lighting.

Common MOT watch-outs

  • !Front suspension wear, tyre wear, and brake corrosion on lightly used cars.
5
Known Issues
1
Serious
4
Moderate
0
Minor

All Known Issues

BDC (Body Domain Controller) Water Damage

SeriousElectrics & Electronics

Water ingress from blocked drains or A-pillar seals can damage the BDC module, leading to total electrical failure.

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

Interior electronics failing, Lights flickering, Roof operation issues, No-start

What to Inspect:
  • Check for dampness in the passenger footwell
  • Ensure sunroof/roof drains are clear
  • Look for corrosion on BDC plugs
Verified by IsItAGoodCar Research Team

Upper Engine Mount Failure

ModerateEngine

The same hydraulic upper mount issue seen on the F56 hatch creates extra vibration and drivetrain movement.

Est. Repair Cost: £250–£450
Warning Signs:

Idle vibration, Knock when moving off, Visible leaking mount

What to Inspect:
  • Inspect mount for cracks and fluid loss
  • Watch engine movement when blipping the throttle
  • Ask if the updated mount has been fitted
Verified by IsItAGoodCar Research Team

Roof Position Sensor / Drain Issues

ModerateBodywork & Rust

The electric soft top is reliable overall, but blocked drains or failing position sensors can interrupt operation and lead to damp trim.

Est. Repair Cost: £150–£700
Warning Signs:

Roof stops mid-cycle, Roof warning light, Wet rear trims or boot lining

What to Inspect:
  • Run the hood multiple times
  • Inspect drains and roof seals
  • Check for signs of mildew or recently dried carpets
Verified by IsItAGoodCar Research Team

Front Suspension Bush Wear

ModerateSuspension & Chassis

Heavy wheels and UK potholes wear front bushes and drop links, causing the familiar MINI knock from the front axle.

Est. Repair Cost: £200–£400
Warning Signs:

Knocking at low speed, Tyre shoulder wear, Slight steering tug under braking

What to Inspect:
  • Inspect front arm bushes and drop links
  • Check alignment and tyre wear
  • Drive over rough roads with the roof up and down
Verified by IsItAGoodCar Research Team

"Secure Vehicle Against Rolling" (Shifter Spring)

ModerateGearbox & Transmission

Automatic models can trigger a drivetrain warning due to a tiny broken spring in the selector mechanism.

Est. Repair Cost: £100–£1,200
Warning Signs:

"Secure vehicle against rolling" warning, Drivetrain alert when in Park, Fault code 420106

What to Inspect:
  • Confirm if the warning is present when turning off the car
  • Ask if the shifter assembly has been updated
Verified by IsItAGoodCar Research Team

Buying Tips for 2018 MINI Convertible (F57)

  • ✓A 2018-on F57 Cooper S is often the best all-round used Convertible if you want pace without R57 engine drama.
2016–20172019–2020
Check a 2018 MINI Convertible (F57) by Registration