Subaru Impreza Mk4 (GJ/GP) Common Problems & Reliability
The Mk4 trades old-school Subaru feel for comfort and efficiency. It is generally sensible to own, but this is the generation most linked with FB20 oil consumption and CVT sensitivity.
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Detailed fault breakdown, symptoms, and estimated repair bills by production year.
Most Common Subaru Impreza Mk4 (GJ/GP) Faults & Repair Costs
Excessive Oil Consumption
Early FB20 engines can use oil quickly enough to require frequent top-ups between services, and neglected low oil levels can lead to bigger engine wear.
Low oil warning between services, Noticeable oil use, Sooty exhaust tip
Lineartronic CVT Valve Body Failure
The Mk4 Impreza’s CVT can suffer solenoid or valve body faults that show up as shunting, hesitation and warning-light clusters.
Judder pulling away, Transmission warning lights, Delayed engagement
Air-Conditioning Condenser Damage
The low-mounted condenser is vulnerable to stone damage and corrosion, leaving some cars with weak or completely failed air conditioning.
AC blows warm, Cooling fades after regas, Visible oily marks on condenser
Buying a used Subaru Impreza Mk4 (GJ/GP)? Always check for hidden finance and write-off history.
Mechanical problems are only half the battle. Over 1 in 3 UK used cars checked have unpaid finance or accident write-off records that could cause you to lose the car or thousands in value.