Car Diagnostics

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0118 979 6677

What is a car diagnostic test?

A car diagnostic test is like a health check for your car. These days most car engines are at least partially computerised, which means an on board computer, called the engine control unit, monitors the engine. The first sign we usually see of this is when we see a warning light on the dashboard to signify a potential error, but actually your car’s on board computer is always working, monitoring how the engine is running. We use specialist car diagnostics software to “read” the on board computer in your car and diagnose any potential problems. 

Why is a car diagnostic test important?

Although car diagnostic testing is invaluable when there is something wrong with your car, it can also be useful before a problem occurs. Regular vehicle diagnostic testing can detect small problems before they become large, expensive issues.

Before vehicles had enging control units, finding and diagnosing a problem in a car could be time consuming and difficult. Without a warning light on the dashboard, we often didn’t know there was a problem with the car until it had broken down at the side of the road. These days your on board computer can detect a minor fault very early on and sophisticated engine diagnostic software can check for stored history of the vehicle as well as any manufacturer notifications. This provides us with a full picture of your car, allowing us to provide you with a great service.

What areas of the car does car diagnostics test?

Our specialist engine diagnostic software can read error codes generated by your car’s engine control unit, testing for faults across the following vehicle systems:

  • Engine management
  • Tyres
  • Emissions
  • Lights
  • Comfort Controls

Car diagnostic software can also reset any service lights on your dashboard, test and adjust your braking system and adjust headlamp brightness levels.

I've used MOT City for several years now. The service is always excellent and the work is thorough and professional.

How often does my car need to have engine diagnostic testing? 

Of course, if there is a light on your dashboard you should book in right away – but it can also be beneficial to have a car diagnostic test once a year just to make sure everything is running ok. As well as this, if you ever feel that something is not quite right in your car, or can hear a strange sound in the engine that bothers you, it is always worth bringing your car in for car diagnostic testing and we can locate any issues.

How much is car diagnostic testing?

Car diagnostics testing costs £40 +VAT.

Are there hidden costs with car diagnostic testing?

No, we will only ever charge you £40 +VAT for car diagnostic testing. If we find something that requires extra work we will always speak to you first and provide a quote before carrying out any repair work.

How do I know if there’s a leak in my aircon?

When we service your air conditioning we will perform a vacuum check which will highlight any damage or cracks which could be causing a leak. If we find a problem we will discuss your options with you before carrying out any work.

R1234YF refrigerant

All cars manufactured since 2017 are required by law to use R1234YF refrigerant gas in their air conditioning units. We can provide this refrigerant if your vehicle requires it.