Engine Diagnostics Test

Engine Diagnostics Test

These alerts can often signal a problem with your engine or another crucial system in your vehicle. A diagnostic test scans your car’s internal systems to detect faults with key components such as the engine, brakes, exhaust, and more. Most complete diagnostic checks take less than 2 hours and provide insights into dashboard warnings and potential mechanical issues.

You can access these diagnostic services at MIRRACOAT LTD. To make an appointment, click below to send us a message or call 01493 853957 and we'll get you booked in.

What is a fault code diagnostic?

When your dashboard lights up with a warning or shows an error message, a diagnostic scan can pinpoint the issue before it worsens.

Electronic Control Units (ECUs)

Modern cars are equipped with built-in computers called Electronic Control Units (or ECUs) that constantly monitor the vehicle’s performance. These systems, sometimes referred to as the Engine Control Module (ECM), Engine Management System (EMS), or Electronic Control Module (ECM), can detect and report faults using specific codes.

Sensors located throughout the vehicle send data to the ECU. If a problem arises—like overheating or low fluid levels—the ECU produces an error code, which then triggers a warning light on your dashboard. These codes require specialist tools to interpret properly.

There are hundreds of potential diagnostic codes (OBD2), and reading them accurately requires a dedicated fault code reader. While a dashboard light can indicate something's wrong, the full picture only becomes clear after an in-depth diagnostic scan. In some cases, further investigation by a specialist may be recommended.

Is a diagnostic test worth it?

With costs starting from just £40, a diagnostic scan is a cost-effective way to identify engine or system issues. These tests can reveal problems even if no warning light has appeared yet—helping to prevent costly repairs down the line.

What do dashboard warning lights mean?

Dashboard lights are your vehicle’s way of telling you when something needs attention. Some lights are simple reminders (like low fuel), while others warn of serious problems (like engine trouble or brake failure).

The check engine light

Among the most important alerts is the check engine light—also called the engine malfunction light or yellow engine light. This usually means there’s a problem affecting your engine’s performance. It might show in yellow, amber, or even orange depending on the make of your vehicle.

If this light appears—especially if it’s flashing—it’s critical to have the vehicle checked right away, as it could indicate a serious issue.

To find the source of the problem, our technicians use scanners to read the fault codes. With this information, we can diagnose the issue and suggest any necessary repairs. Our service offers a cost-effective alternative to dealership diagnostics, and if the problem is resolved, the check engine light can be reset.

Diagnostics for all makes and models

Whether you drive a Ford, BMW, Audi, Vauxhall, Mercedes, Volkswagen, or another make, our scanners are compatible with all major manufacturers. Just plug in the diagnostic tool and we’ll retrieve any stored fault codes from your ECU.

Our expert technicians are here to interpret the results and advise on the best course of action before issues become more severe.

What’s included in a full diagnostic check?

A full vehicle diagnostics test offers valuable insight into a range of performance and safety factors, such as:

• Engine function and control
• Transmission performance
• Ignition coil faults
• Throttle response
• Exhaust system efficiency
• Brake system health
• Engine coolant levels
• Fuel injection accuracy
• Ignition timing

Depending on the car, the test may also gather data from other systems, like lighting, tyre pressure, and comfort features.

How much does a car diagnostic test cost?

Diagnostic test pricing can vary depending on your vehicle and where the test is performed. Some car models require more advanced equipment, and high-performance or specialty vehicles may need tailored tools.

A diagnostic scan starts from just £40 and staying on top of routine maintenance and scheduling regular diagnostics can help avoid unexpected - and expensive problems at a later date.

Book your fault code scan today - You can book an on-board diagnostic check with us and our trained team will scan your vehicle and help resolve any issues detected.

To schedule an appointment or learn more, get in contact via the button below: