4 FAQs About Engine Remapping

Published on: 22 January 2026

Drivers keen to increase the performance and/or economy of their vehicle may well find the answers they’re looking for in engine remapping, where software changes are carried out within the electronic control unit (ECU) to suit specific requirements.

To help you decide if this is the right path for you, here are some of the more frequently asked questions we get here at KeyTune365.

If you need any further help or advice, give the team a call today.

1. What is remapping your engine?

Also known as chip tuning, remapping alters the factory settings of your vehicle’s engine control unit to improve power, torque, performance and fuel efficiency by changing parameters like ignition timing, pressure and fuel injection.

Car manufacturers often set conservative limits for these parameters, but remapping can get around this quickly. Note, however, that you may need to prioritise vehicle maintenance more, as pushing certain limits can put extra stress on car components.

2. Will a remapped car pass its MOT?

A legitimate concern but, as long as your engine is remapped by a professional with lots of experience, there is no need to worry that a fine-tuned car will not pass its MOT because of ECU changes.

3. How much does it cost to get an engine remapped?

Remapping costs will depend on various different factors, including engine type, the make and model of your car and the work level involved in connecting to the ECU to install remap files. If you’d like to get a free no-obligation quote, give us a call!

4. Will my insurance go up if I remap my car?

One key point to note is that you may well find your insurance costs increase if you remap your vehicle. Always tell your insurer before you make any modifications to your car so you can make a fully informed decision.