Diagnostics

  • Vehicle diagnostics is the process of identifying the root cause of faults or warning lights on your vehicle. While many people associate diagnostics with “plugging in a computer” and reading fault codes, that’s just the starting point.

    A fault code doesn’t tell you exactly what’s wrong — it tells you where to start looking.

    At a professional level, diagnostics involves:

    • Interpreting fault codes in context

    • Performing live data analysis

    • Testing components and wiring

    • Using technical service bulletins and manufacturer data

    • Ruling out false positives or related system faults

    Any good workshop or technician understands that diagnosing modern vehicles is an in-depth, methodical process — not guesswork and not just code reading. It requires experience, system knowledge, and the right tools.

    At Autotest, we pride ourselves on getting to the real cause of the problem, not just clearing warning lights. We treat every diagnostic job with the detail and professionalism it deserves — because that’s what keeps faults from coming back.

  • Our diagnostic process goes far beyond simply plugging in a tool and reading fault codes. While scan tools are an important part of the job, they’re just the beginning. We take a methodical and in-depth approach to identifying the real root cause of faults, not just the symptoms.

    Here's what you can expect when you book diagnostics with us:

    1. Initial Assessment
      We’ll carry out an initial inspection and fault code read. This helps us understand where to focus and what systems are involved.

    2. Technical Diagnosis
      If further investigation is required, we’ll perform advanced diagnostics using live data, sensor testing, wiring checks, manufacturer documentation, and more — depending on the issue.

    3. Customer Communication
      Before carrying out any chargeable or in-depth work, we’ll contact you to explain what we’ve found so far, discuss next steps, and get your approval. You're always in control.

    4. Clear Reporting & Advice
      We’ll provide a clear explanation of what’s wrong, why it’s happening, and what can be done to fix it — even if we don’t carry out the repair ourselves.

  • We’ve built our reputation by supporting other garages and workshops throughout the region. Much of our work comes from trade customers who rely on us to handle the complex faults that fall outside their scope.

    Because of this, there are times when we may not carry out the repairs ourselves — especially if it’s a large mechanical job. However, we will always:

    • Offer honest, detailed diagnostic findings

    • Recommend trusted garages we work with regularly

    • Liaise directly with them where needed to ensure a smooth handover

    Our goal is always to give you the right answers, not just to sell you repairs. Whether you're a member of the public or another workshop, we’re here to help you get to the bottom of the problem — properly.

  • Our current booking times for diagnostic appointments are typically 3–8 weeks in advance, depending on the complexity of the issue and current workshop demand.

    However, we may have sooner availability for urgent or simpler faults, and we also maintain a cancellation list for short-notice slots.

    We recommend:

    • Filling out the enquiry form with as much detail as possible

    • Letting us know if your vehicle is not driveable or off-road

    • Mentioning if you're flexible with days/times — we’ll do our best to accommodate

    Once we receive your enquiry, our team will review it and get in touch within 1–2 working days to discuss availability and confirm your booking.

Diagnostic

Enquiry Form