CNR Services
Diagnostic equipment connected to a vehicle

Diagnostics

Plug-in and in-depth diagnostics to quickly and accurately pinpoint faults, warning lights and intermittent issues.

Two Levels Of Diagnostics

We offer two levels of diagnostic service depending on what your vehicle needs. A standard plug-in diagnostic reads fault codes from your car's ECU, perfect for identifying the cause of a dashboard warning light or checking for stored faults.

For more complex or intermittent issues, our in-depth diagnostic service goes further, reading live data, running actuator tests and tracing faults through wiring and components. We cover all makes and models, with specialist diagnostic knowledge of Ford, Mazda, Volvo, Land Rover, Jaguar and American and import vehicles. Ideal for problems that don't show an obvious fault code or have been misdiagnosed elsewhere.

What We Cover

  • Plug-in diagnostics for fault codes and warning lights
  • In-depth diagnostics for complex or intermittent faults
  • All makes and models covered
  • Specialist knowledge of Ford, Mazda, Volvo, Land Rover, Jaguar and import systems
  • Live data reading and analysis
  • Engine management and emissions diagnostics
  • ABS, airbag and electronic system fault-finding
  • Clear explanation of findings and recommended repairs

    • Frequently Asked Questions

    A plug-in diagnostic reads fault codes stored in your car's ECU - it's quick and ideal for identifying the cause of a dashboard warning light. An in-depth diagnostic goes further, reading live data, running actuator tests and tracing faults through wiring and components. It's suited to complex or intermittent problems that don't show an obvious fault code.

    A steady engine warning light usually means something needs attention but isn't immediately dangerous. You should get it checked soon to avoid further damage. A flashing engine light is more serious and you should stop driving as soon as it's safe to do so and call us.

    Yes, we regularly solve problems that have been misdiagnosed elsewhere. Our in-depth diagnostic service combined with specialist knowledge of Ford, Mazda, Volvo, Land Rover, Jaguar and import vehicles means we can trace faults that standard code readers miss.

    A standard plug-in diagnostic is usually done within the hour. In-depth diagnostics can take longer depending on the complexity of the fault - we'll give you an idea of timescale when you book in.

    Yes, there is a diagnostic fee which covers the time and expertise involved in finding the fault. If you go ahead with repairs, we'll discuss the total cost with you before starting any work.