Common Car Problems Found During Pre-Purchase Inspections

Worn or stretched timing chains are one of the most common — and most expensive — faults we find on used BMWs, Audis, and Volkswagens. A snapped timing chain can destroy an engine entirely. Without a diagnostic scan and physical inspection, this fault is almost impossible for a buyer to detect.

Sellers often repaint or fill over accident damage rather than disclosing it. We use trained eyes and reference guide measurements to detect mismatched panel gaps, overspray, filler, and structural repairs that suggest a significant previous collision.

Brake pads and discs are often near the end of their life when cars appear on the used market. This is something sellers rarely disclose. We measure pad thickness and inspect disc condition as standard in every pre-purchase inspection.

Diesel particulate filter (DPF) and catalytic converter faults are extremely common on diesel cars used primarily for short, urban journeys. Replacement can be very expensive — and sellers frequently clear the warning light before putting a car up for sale.

Worn bushes, ball joints, and shock absorbers are common on higher-mileage cars. They affect handling and safety, but are often masked during a brief test drive. Our inspection physically checks every suspension component.

Milky oil or coolant, low fluid levels, or signs of recent topping-up can indicate head gasket failure — one of the most expensive engine repairs. We check all fluids and look for the tell-tale signs of coolant-oil contamination.

Sellers frequently clear fault codes before advertising a car. However, many faults return quickly, and our professional diagnostic equipment captures even recently-cleared codes and 'pending' faults that a basic reader would miss.

DSG and dual-clutch gearboxes in particular are prone to expensive issues that can be hidden with a fresh oil change. We put cars through their full driving range on a ramp to assess gearbox behaviour under load.