2018 AUDI A42.0L Diesel

The 2018 Audi A4’s most recent MOT test on 2025-07-22—just 12 months ago—confirmed it passed without defects, though the preceding day’s test at the same mileage (134,434) resulted in a failure for an unspecified reason. This abrupt reversal suggests either a last-minute rectification of a minor, non-critical issue or a procedural anomaly, as no defects were logged in the subsequent pass. The pattern over the past three years remains consistent: two consecutive tests per year, each time failing then passing at identical mileages, with no substantive faults recorded. While this indicates no recurring mechanical failures, the repeated test-and-retest cycle warrants scrutiny of what may have been addressed—likely a minor advisory or a component nearing the threshold for failure, such as brake wear or suspension alignment. The vehicle’s mileage progression of 134,435 miles over eight years averages 16,804 miles annually, which is above the typical range for a car of this age. The gap between tests is uniform, with roughly 10,000 miles accumulated between each pair of 2023-2024 and 2024-2025 tests, suggesting consistent use rather than sporadic driving. This level of mileage implies accelerated wear on high-stress components like coil springs, suspension bushes, and brake calipers, which may not have been systematically serviced. The absence of advisories or defects in the MOT history does not preclude underlying issues, particularly in areas like subframe corrosion or drivetrain fluid degradation, which often go unnoticed until they manifest as failures. Given the lack of specific faults in the MOT record, a buyer should prioritise a thorough inspection of the suspension system, particularly the condition of coil springs for cracks or broken leaves, and the integrity of suspension bushes and track rods for excessive play or corrosion. The braking system, though not flagged, should be examined for uneven wear on discs or pads, binding calipers, or warping, especially if the vehicle was driven hard. Attention should also be given to the subframe and wheel arches for signs of rust penetration, as this is a common failure point in Audi models of this era. Finally, the exhaust system should be checked for leaks or excessive corrosion, as catalytic converter failures can occur without prior warning. The repeated test cycle hints at potential oversights in maintenance, so verifying service history for fluid changes and alignment work is essential.