IsItAGoodCar
Reliability Guide

Common Problems with the
2019 Subaru Forester Mk5 (SK)

Early UK e-Boxer cars are worth checking carefully for software updates and consistent hybrid-system behaviour.

2
Known Issues
0
Serious
2
Moderate
0
Minor

All Known Issues

Thermo Control Valve Failure

ModerateCooling System

SK Foresters can trigger multiple warning lights and poor cabin heat when the thermo control valve sticks or fails internally.

Est. Repair Cost: £400–£900
Warning Signs:

Engine management warning, Poor heater performance, Cooling fan running unexpectedly

What to Inspect:
  • Make sure the heater gets hot quickly
  • Scan for stored cooling-system faults
  • Ask whether the valve has already been replaced
Verified by IsItAGoodCar Research Team

Lineartronic CVT Hesitation or Judder

ModerateGearbox & Transmission

Later CVTs are generally better, but neglected fluid changes can still lead to shuddering, hesitation and expensive transmission diagnostics.

Est. Repair Cost: £300–£1,800
Warning Signs:

Shudder under light throttle, Delayed response pulling away, Transmission warning messages

What to Inspect:
  • Drive at low speed in traffic-like conditions
  • Check for smooth response on inclines
  • Look for documented CVT servicing rather than verbal assurances
Verified by IsItAGoodCar Research Team

Buying Tips for 2019 Subaru Forester Mk5 (SK)

  • ✓Watch for warning lights after repeated stop-start operation on the test drive.
20182020–2023
Check a 2019 Subaru Forester Mk5 (SK) by Registration