A professional OBD diagnostic scan goes far beyond a basic fault-code check. AutoGuard Spain’s diagnostic process covers all major systems on the vehicle:

• Engine Management — The most critical system. Fault codes here can indicate injector problems, turbo faults, timing chain wear, or emissions failures that result in expensive repairs. A pending code — one not yet showing a dashboard warning light — is a common sign of a developing problem a seller wants to hide.
• Transmission & Gearbox — Automatic and dual-clutch gearboxes are expensive to repair. The diagnostic scan identifies shift faults, pressure issues, or software errors that point to imminent failure.
• ABS & Braking System — Safety-critical faults in the antilock braking system or electronic stability control are identified, including wheel speed sensor failures that may not be apparent during a normal test drive.
• Airbag & SRS System — Previous accident repairs are sometimes carried out without resetting or replacing airbag components. A diagnostic scan confirms whether the SRS system is fully functional and whether any crash data is stored in the system.
• Emissions & Exhaust System — Particularly relevant in Spain, where ITV emissions testing is strict. A failing catalytic converter, DPF blockage, or EGR fault can result in an immediate ITV failure and costly repair bills.
• Climate Control, Lighting & Electrical Systems — Faults in secondary systems indicate poor maintenance history, water ingress, or electrical issues common in coastal vehicles exposed to high humidity and salt-air.

Results are explained in plain English (or Spanish or German) and included in the full written report, delivered within 24 hours. Each fault code is described clearly — along with the likely cause, estimated repair cost, and a clear recommendation: buy, negotiate on price, or walk away.