IsItAGoodCar

Common Problems with the
2016–2018 BMW 1 Series (F20/F21)

We've identified 4 known issues that can affect the 2016–2018 BMW 1 Series (F20/F21). 1 of these are serious faults that could be expensive to repair.

4
Known Issues
1
Serious
2
Moderate
1
Minor

The 2016–2018 period has 3 more issues than the BMW 1 Series (F20/F21) average across all year periods.

All Known Issues

EGR Valve & Cooler Recalls

SeriousExhaust & Emissions

Diesel 116d, 118d, 120d, and 125d models fall into BMW diesel EGR recall years (Recall 18V755) where leaking coolant mixed with soot can create a fire risk.

Most affected: 114d, 116d, 118d, 120d, 125d

Estimated cost: £0 (Recall)Affects: 2011–2019Often appears around: Often 50,000 miles plus, but recall status matters more than mileage

Typical symptoms

  • •Coolant loss with no obvious external leak
  • •Sweet smell after a hot run
  • •EGR or drivetrain warnings on diesel models

What to inspect before you buy

  • ✓Run the VIN through BMW recall history and insist on completed campaign evidence (specifically 18V755)
  • ✓Inspect for white residue around the EGR area
  • ✓Avoid cars showing unexplained coolant loss until inspected

Steering Rack Rattle

ModerateSteering

The electronic steering rack can develop play in the thrust piece, creating a clonk or rattle over broken UK roads. Some cars only need the repair kit; others need a full rack.

Most affected: Most F20/F21 models including Sport and M Sport

Estimated cost: £200–£1,200Affects: 2011–2018Often appears around: 40,000-100,000 miles

Typical symptoms

  • •Clonk through the wheel over potholes
  • •Vague on-centre feel
  • •Noise at low speed when rocking the steering

What to inspect before you buy

  • ✓Road-test on rough surfaces with the windows down
  • ✓Check for play before condemning tyres or top mounts
  • ✓Ask whether the BMW thrust-piece repair has already been done

Coolant Loss (B48/B58 Engines)

ModerateCooling System

Later petrol cars are better than the N13/N20 era, but expansion tanks, vent hoses, and small coolant fittings can still seep and trigger low-level warnings.

Most affected: 118i, 120i, 125i, M140i

Estimated cost: £150–£350Affects: 2015–2019Often appears around: 30,000-80,000 miles

Typical symptoms

  • •Intermittent coolant top-up messages
  • •Pink residue around the tank or hose joints
  • •Heater performance changes after spirited driving

What to inspect before you buy

  • ✓Inspect the expansion tank seam and vent hose
  • ✓Check whether the coolant warning returns after a long test drive
  • ✓Look for crusty residue around the top hose and thermostat area

Door Seal Leaks

MinorBodywork & Rust

Water can enter via failed inner door membranes, soaking carpets and damaging footwell wiring or creating a persistent mildew smell.

Most affected: 3-door and 5-door hatchbacks

Estimated cost: £100–£250Affects: 2011–2019Often appears around: Age-related rather than mileage-specific

Typical symptoms

  • •Wet rear carpets
  • •Condensation on windows
  • •Musty cabin smell

What to inspect before you buy

  • ✓Feel the underlay rather than just the carpet top
  • ✓Inspect door membranes and drain holes
  • ✓Check for repeated dehumidifier packs or signs the car has recently been dried out

Buying Tips for the 2016 BMW 1 Series (F20/F21)

  • ✓2015-on facelift cars with B37/B47/B48/B58 engines are usually the sweet spot for UK buyers
  • ✓Check front tyres, alignment, and steering feel carefully - worn thrust pieces and tired front arms can make them feel crashy or vague
  • ✓Lift the front and rear carpets for dampness if there is any musty smell; failed door membranes are common
  • ✓On six-cylinder M135i/M140i cars, look for coolant top-ups, boost-leak history, and evidence of regular plugs and gearbox servicing
2015 BMW 1 Series (F20/F21)2019 BMW 1 Series (F20/F21)

Browse 2016–2018 BMW 1 Series (F20/F21) in our Directory

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Other BMW 1 Series (F20/F21) Year Periods

2011–201420152016–20182019

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