IsItAGoodCar
Reliability Guide

Common Problems with the
2003 Subaru Forester Mk2 (SG)

We've identified 3 known issues that can affect the 2003 Subaru Forester Mk2 (SG). None are considered critical, but they're worth knowing about before you buy.

3
Known Issues
0
Serious
3
Moderate
0
Minor

All Known Issues

Self-Levelling Suspension (SLS) Failure

ModerateSuspension & Chassis

The original rear struts leak and sag over time, leaving the rear of the SG sitting low, especially when towing or loaded. Suspension is a leading MOT failure area on this generation, and genuine OEM SLS parts are expensive in the UK.

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

Rear sits noticeably lower, Bouncy ride over bumps, Fluid leaks on the rear struts

What to Inspect:
  • Check arch-to-tyre gap at the rear
  • Look for standard spring conversions as a positive sign
  • Inspect the struts for oil misting
Verified by IsItAGoodCar Research TeamUpdated

Rear Subframe and Mounting Point Corrosion

ModerateBodywork & Rust

UK road salt attacks the rear subframe and its suspension mounting points, often before the body panels look especially rusty. Corrosion around prescribed areas is a recorded MOT failure on this generation and can become structural if ignored.

Est. Repair Cost: £400–£1,200
Warning Signs:

Heavy rust scaling underneath, Corrosion advisories near suspension mounts, Seized suspension bolts

What to Inspect:
  • Inspect the rear cradle on a ramp if possible
  • Read past MOT corrosion advisories closely
  • Check for fresh underseal hiding flaky metal
Verified by IsItAGoodCar Research TeamUpdated

Exhaust System Corrosion and Leaks

ModerateExhaust & Emissions

The SG's exhaust, silencer and pipes rust under UK winter salt, causing loud blowing or rattling noises and potential MOT failure on exhaust noise, emissions or leaks. Once the car has covered high mileage on salty roads this is a common and predictable wear item.

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

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

What to Inspect:
  • Listen for an exhaust blow with the engine cold
  • Inspect the silencer and pipes for rust holes
  • Check MOT history for repeated exhaust advisories
Verified by IsItAGoodCar Research TeamUpdated

Buying Tips for 2003 Subaru Forester Mk2 (SG)

  • Avoid 2.5 XT models with no history of head gasket or cambelt work unless the price reflects the risk.
  • Check for the "saggy butt" look, indicating failed self-levelling rear suspension.
  • Wind noise from the door gussets (mirrors) is common and can be fixed with a simple seal replacement.
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Check a 2003 Subaru Forester Mk2 (SG) by Registration