2004 Subaru Impreza 2.0L Petrol · SJ04 PHN

The most recent DVSA test on 2 October 2023 resulted in a pass, with three advisories recorded: corrosion on the brake pipe front to rear (covered in grease or other material), excessive underseal on the offside and nearside lower sills masking potential corrosion, and deteriorated nearside inner and outer CV gaiters. The general trend across recent tests is stable in terms of pass outcomes, but the accumulating advisories over successive years suggest an ageing vehicle that requires increasing attention to corrosion-related items, drivetrain sealing, and underbody condition. A track rod end ball joint failure on both sides in 2020 was rectified and has not recurred, which is reassuring, but the recurring brake pipe corrosion advisories from 2020 through 2023 indicate that the underfloor brake lines may be progressively deteriorating and will likely need replacement before the next test. The recorded mileage of 126,975 miles across approximately 22 years equates to an annual average of around 5,770 miles, which is notably low for any vehicle and particularly for a Subaru Impreza of this era, which often accumulates higher mileages due to its enthusiast following. There are gaps in the MOT history between 2015 and 2017, between 2017 and 2018, and between 2018 and 2020, which could indicate periods of non-use or SORN status, but the low overall average suggests this car has spent considerable time either stationary or used only for short, infrequent journeys. This pattern of light or intermittent use is mechanically significant, as prolonged standing can accelerate corrosion on braking components, caliper seizure, exhaust degradation, and deterioration of rubber and polymer items, while short journeys prevent the engine and drivetrain from reaching full operating temperature, leading to moisture accumulation in the oil and potential internal corrosion. Given the age and the nature of the advisories on record, a prospective buyer should carry out a thorough physical inspection. With brake pipe corrosion already noted at multiple tests, the underfloor brake lines should be carefully examined for pitting, rust-through, or flaking, and the flexible sections near the rear axle and at chassis mounting points warrant particular attention, as these are common failure locations. The CV gaiter deterioration flagged in 2022 and again in 2023 suggests the rubber boots are perishing; on a test drive, listen for rhythmic clicking from the front hubs during low-speed turns, which would indicate a failed gaiter and grease loss requiring immediate joint replacement. The lower sills that were noted as excessively undersealed should be probed with a screwdriver or awl to check whether the underseal is hiding active corrosion, as Subaru Imprezas of this generation are known for sill and rear arch corrosion, particularly around the jacking points and structural seams. Additionally, a compression test on the horizontally opposed engine and inspection for oil leaks from the camshaft seals, valve cover gaskets, and rear main seal would be prudent given the engine's age and boxer configuration. Beyond the recorded defects, age and low-mileage-related checks should include a thorough inspection of all four tyres for sidewall cracking, perishing, and tread depth, as rubber degrades with age regardless of wear. The 12-volt battery should be tested for cranking strength, as a 22-year-old vehicle may have an original or ageing unit. All brake calipers, especially at the rear, should be checked for binding or seized pistons, and the brake discs examined for severe corrosion ridges that could cause pedal pulsation. Coolant and brake fluid should be assessed for age-related degradation, as both require periodic replacement irrespective of mileage. On test drive, listen for any clonks or knocks from the suspension over bumps, which could indicate worn bushes, droplinks, or top mounts, and pay attention to the gearbox and clutch operation, as these are common wear points on higher-mileage Imprezas. Finally, verify full service history with particular attention to cambelt and balance shaft belt replacement intervals, as neglect of these on the boxer engine can lead to catastrophic internal damage.