All-wheel-drive workhorse with boxer engine soul
The Subaru Legacy occupies a unique space as an affordable all-wheel-drive estate and saloon with genuine enthusiast credentials, particularly in turbocharged form. It appeals to rural drivers, dog owners, and Subaru loyalists who value AWD traction and the characteristic boxer engine over showroom polish. Used values are modest, making the Legacy a budget route into symmetrical AWD ownership.
We track 5 known issues across the Subaru Legacy range, including 1 rated as safety-critical. Knowing which variants and configurations to approach with caution can save you from expensive surprises after purchase.
Found a Subaru Legacy? Enter the reg to see which of our 5 known issues apply to that exact car, plus full MOT history and mileage checks.
BL (1998–2003) — Engine options included the 2.0L flat-four, 2.0L flat-four, 2.0L flat-four, 2.5L flat-four. Our database flags 3 known issues on this generation, 1 of which are rated as safety-critical. The most significant concern is Vehicle structure corrosion (£500–£2,000 to address).
BM (2009–2014) — Petrol options included the 2.0L flat-four, 2.0L flat-four, 2.0L flat-four, 2.0L flat-four, 2.5L flat-four, 3.0L flat-six, with 2.0L diesel flat-four on the diesel side.
BN (2014–2020) — Engine options included the 2.0L flat-four, 2.0L flat-four, 2.5L flat-four.
Subaru Legacy models show structural corrosion rates up to 11.1 times higher than the fleet average, particularly affecting the subframe and structural mounting points. This is a dangerous defect that compromises the vehicle's structural integrity. The issue is most prevalent on higher-mileage vehicles and those exposed to road salt. MOT data shows this fault occurring across all engine variants, with peak failures in the 120,000-150,000 mile range.
Structural corrosion is classified as dangerous because it reduces the vehicle's crash protection and can lead to suspension or steering component detachment. The vehicle should not be driven until professionally assessed. Repair typically requires welding or component replacement costing £500-£2,000 depending on extent. Severe cases may render the vehicle economically unviable.
Inspect the wheel arches, sills, jacking points and door bottoms carefully. Press gently on sills to check for soft spots. Look underneath for corrosion on structural components. Check the MOT history for corrosion-related advisories or failures.
Subaru Legacy models show excessive wear rates in suspension bushes, joints, and pins compared to the fleet average. MOT data indicates failure rates up to 32 times higher than typical vehicles, particularly affecting lower control arm bushes, anti-roll bar links, and ball joints. The flat-four engine layout and all-wheel-drive system place different stresses on the suspension compared to conventional front-wheel-drive cars. Worn components cause poor handling, uneven tyre wear, and MOT failures.
Worn suspension components compromise vehicle handling and safety, particularly in emergency manoeuvres. Continued driving accelerates tyre wear and can lead to MOT failure. Complete suspension overhaul typically costs £800-£1,500 depending on which components require replacement.
Listen for knocking, clunking or rattling over bumps during the test drive. Inspect the underside for corroded or cracked suspension components. Check the MOT history for suspension-related advisories, which often predict future failures.
Fifth and sixth generation Legacy models with CVT (Continuously Variable Transmission) suffer from premature transmission failure, particularly the torque converter and internal components. NHTSA complaints document 55 specific torque converter failures and 39 general CVT issues. The transmission may slip, shudder, or fail to engage properly. Subaru initially marketed the CVT fluid as 'lifetime' but specialists now recommend changes at 100,000 miles to prevent failure.
CVT failure typically requires complete transmission replacement or rebuild, with costs ranging from £3,000-£5,000. The car may become undriveable if the transmission fails completely. Early intervention with fluid changes and software updates can extend transmission life significantly.
Test the automatic gearbox extensively in slow traffic, car parks and on hill starts. Feel for any juddering, hesitation or clunking during gear changes. Try repeated low-speed manoeuvres as this is where problems are most apparent.
Early Subaru flat-four engines are prone to head gasket failure, particularly external coolant leaks rather than internal combustion chamber breaches. The horizontal engine layout places different stresses on the head gaskets compared to conventional upright engines. NHTSA complaints document recurring head gasket problems with multiple repairs required. Symptoms typically develop gradually and may initially present as minor coolant loss.
Head gasket failure can lead to engine overheating, coolant loss, and potential engine damage if not addressed promptly. Repair involves removing the cylinder heads and typically costs £1,200-£2,000. If coolant enters the oil system, internal engine damage may occur requiring complete engine rebuild.
Look for oil weeping around gasket surfaces — rocker cover, sump and timing cover are common areas. Check for coolant mixing with oil (creamy residue on the filler cap) which indicates a more serious head gasket issue.
MOT data shows failure rates 14.8 times higher than typical vehicles, concentrated in the 80,000-120,000 mile range. The fault typically involves wheel speed sensors, ABS pump units, or control module software issues. This affects vehicle stability systems and causes MOT failure.
ESC malfunction compromises vehicle stability in emergency situations and will result in MOT failure. Diagnostic costs typically £80-£120, with sensor replacement costing £150-£300 per corner. ABS pump replacement is significantly more expensive at £800-£1,500.
Check all electrical functions systematically: windows, mirrors, lights, infotainment, heated seats, air conditioning. Look for any warning lights on the dashboard. A diagnostic scan before purchase can reveal stored fault codes.
For the full breakdown of all 5 tracked issues with repair costs, see the Subaru Legacy common problems page.
Based on 35k real DVSA MOT tests, the Subaru Legacy fails more often than average on several items. The biggest outlier is abs fault at 28x the fleet average, followed by anti-roll bar links worn (27x).
When viewing a specific car, check its MOT history for recurring advisories in these categories. See the full Subaru Legacy MOT failure breakdown for data at every mileage point.
Routine servicing (oil and filter change every 10k miles) typically costs £80–£120 at an independent garage.
The bigger-ticket items to budget for include cvt transmission fluid (£200–£300).
See the full Subaru Legacy service schedule for every interval and cost breakdown.
The Subaru Legacy has some well-documented weak points, including 1 safety-critical issue that demand careful checking. The right example, properly maintained, can still be a sound purchase — but cutting corners on the pre-purchase inspection is not advisable. The 2003-2009 fourth-generation (BP) is widely considered the sweet spot, combining mature boxer engines with improved build quality and a comfortable interior. For UK buyers, the 2.0 and 2.5 naturally aspirated models offer the best reliability. Avoid the 2010 and 2013 model years due to excessive oil consumption and engine problems respectively.
Before committing, check the car's full MOT history, verify the service record is complete, and if possible arrange a specialist inspection. Enter any registration into our free report to see the complete picture.
Get Car Wise maintains a database of known mechanical issues for every popular car on UK roads, tracking the faults that owners, specialists and DVSA data reveal.
When you run a report on a specific Subaru Legacy, we cross-reference the exact variant, engine and age against our database of 5 known issues. Combined with full MOT history analysis, mileage verification and DVLA data, you get a complete picture before viewing.
Enter the registration for MOT history, mileage verification, known faults for that exact variant, and a Get Car Wise Score.
This guide was compiled from independent expert reviews, DVSA MOT data, specialist workshops and our own database of 5 known Subaru Legacy issues. We are not affiliated with any source listed.