2004 BMW Z4 3.0L Petrol · SN04 ABS

The BMW Z4’s most recent MOT history reveals a vehicle that has struggled with persistent, unresolved issues despite minimal mileage accumulation. The October 2025 test at 88,861 miles failed outright due to headlamp alignment and lens condition, yet the same faults were already present in the October 2024 pass—suggesting the owner either ignored advisories or lacked the expertise to correct them. The nearside rear brake pipe corrosion, first noted in October 2023 and still unresolved in 2025, indicates a serious oversight in fluid system maintenance, while the headlamp aim failures point to either misalignment or a faulty adjustment mechanism. The trend is clearly worsening, with critical components like lighting and braking infrastructure receiving no corrective action over two years. The Z4’s mileage of just 4,039 miles annually over 22 years is unusually low, raising questions about whether the car has been stored or driven sparingly. Between October 2023 and October 2025, the odometer only advanced by 537 miles—a stark contrast to typical usage patterns for a vehicle of this age. Such minimal running could mask wear in suspension bushes, coil springs, or binding calipers, as these components degrade more from cyclic loading than absolute distance. However, the corrosion on the rear brake pipe suggests exposure to moisture, implying the car hasn’t been stored in ideal conditions. The lack of mileage doesn’t absolve the owner of neglect; instead, it highlights how even light use can still lead to preventable deterioration when basic checks are skipped. A prospective buyer should prioritise an in-person inspection of the rear brake system, particularly the corroded pipe and its connections, as fluid leaks or compromised integrity could lead to brake failure. The headlamp assembly—including the aim and lens condition—must be verified, as repeated failures suggest either a faulty adjustment mechanism or a structural issue with the mounting. Suspension components, such as control arm bushes and coil springs, should be checked for wear, given the low mileage could conceal hidden fatigue. Finally, the battery’s insecure mounting, noted in 2023, remains an unresolved advisory; a loose battery risks damage to electrical systems or, in extreme cases, detachment while driving. The vehicle’s history points to a pattern of deferred maintenance rather than mechanical failure, meaning many issues could be rectified—but only if the new owner addresses them promptly.