IsItAGoodCar
Reliability Guide

Common Problems with the
2001 Subaru Forester Mk1 (SF)

We've identified 4 known issues that can affect the 2001 Subaru Forester Mk1 (SF). 1 of these are serious faults that could be expensive to repair.

4
Known Issues
1
Serious
3
Moderate
0
Minor

All Known Issues

Rear Strut Tower and Chassis Corrosion

SeriousBodywork & Rust

UK road salt attacks the rear strut towers and the "U-brace" front subframe, often rotting them from the inside out. Structural corrosion here is one of the most common MOT failure areas on high-mileage SF Foresters and can lead to an MOT failure or expensive structural repair.

Est. Repair Cost: £500–£2,500
Warning Signs:

Corrosion in the boot area, Knocking from rear suspension, MOT failure for structural rust

What to Inspect:
  • Pull back the boot carpet to see the towers
  • Check the front subframe for flaky or holed metal
  • Inspect brake lines for heavy corrosion
Verified by IsItAGoodCar Research TeamUpdated

Rear Wheel Bearing Failure

ModerateSuspension & Chassis

The SF is known for chewing through rear wheel bearings, which can be a difficult and labor-intensive job to replace if the hub bolts are seized. A failing bearing produces a rising drone and, left too late, can damage the hub.

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

Low-frequency drone from the rear, Noise changes when cornering, Vibration at speed

What to Inspect:
  • Listen for humming on a smooth road
  • Check for play in the rear wheels when jacked up
Verified by IsItAGoodCar Research TeamUpdated

Exhaust System Corrosion and Leaks

ModerateExhaust & Emissions

On UK-salted roads the SF's exhaust system, silencer and pipes rust from the outside in, producing loud blowing or hissing noises and potentially an MOT failure on exhaust noise, emissions or leaks. This is most likely once the car is well into its mileage and has seen several winters.

Est. Repair Cost: £250–£600
Warning Signs:

Loud exhaust roar or hissing, Rattling from underneath the car, Failed MOT on exhaust noise or emissions

What to Inspect:
  • Listen for a blow from the exhaust with the engine cold
  • Inspect the silencer and pipes for rust holes
  • Check previous MOT certificates for exhaust corrosion advisories
Verified by IsItAGoodCar Research TeamUpdated

Brake and Fuel Pipe Underbody Corrosion

ModerateBrakes

The steel brake and fuel lines that run along the sills and over the rear axle corrode under UK road salt, showing white crust or flaking metal. Severe corrosion brings MOT advisories or failures and can risk brake-fluid loss if a pipe penetrates.

Est. Repair Cost: £150–£400
Warning Signs:

White crust or flaking on brake pipes, Spongy or low brake pedal, MOT corrosion advisory on brake or fuel lines

What to Inspect:
  • Trace the brake pipes along the sills and rear axle with a torch
  • Check the brake pedal holds firm with the engine running
  • Read the MOT history for recurring brake-pipe advisories
Verified by IsItAGoodCar Research TeamUpdated

Buying Tips for 2001 Subaru Forester Mk1 (SF)

  • The 2.0L non-turbo engine is arguably Subaru’s most robust unit if the cambelt and oil are changed regularly.
  • Check the radiator top tank for cracks; a failure here usually leads to immediate engine overheating.
  • Inspect the rear strut towers from inside the boot; rot here is a common but hidden killer of SF Foresters.