Subaru Forester Mk4 (SJ) Common Problems & Reliability
The SJ is roomier and more family-friendly than the SH. Petrol cars are generally the safer used buy; diesel examples and neglected CVTs are where the big bills sit.
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Detailed fault breakdown, symptoms, and estimated repair bills by production year.
Most Common Subaru Forester Mk4 (SJ) Faults & Repair Costs
Boxer Diesel Crankshaft and Bearing Failure
Early SJ diesels still carry the same core EE20 weakness as the SH, with bearing wear or crankshaft failure capable of ending the engine without much warning.
Knocking from the lower engine, Oil contamination with metallic debris, Abrupt engine failure
Lineartronic CVT Valve Body Failure
The SJ’s Lineartronic automatic can suffer failed solenoids in the valve body, bringing on warning lights, jerky take-up and expensive dealer quotes.
"AT Oil Temp" warning, Jerky pull-away, Hesitation when coming to a stop
Air-Conditioning Compressor Failure
SJ Foresters can lose cooling because the compressor or clutch assembly wears out, a fault many owners only notice when summer arrives.
AC blows warm at idle, Compressor chatter, Cooling fades in traffic
Buying a used Subaru Forester Mk4 (SJ)? 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.