Frequently Asked Questions

ECU remapping is the process of updating the software inside your vehicle’s engine control unit to improve performance, torque, throttle response, and fuel efficiency. ExTech Tuning uses professional, proven remap files from trusted industry sources — ensuring safe, reliable results without altering the vehicle beyond manufacturer‑safe limits.

Yes. We only use reputable, tested remap software that stays within safe operating parameters. This ensures your engine remains protected, reliable, and fully capable of handling the improved performance.

Yes. If you ever want your vehicle restored to stock — for selling, servicing, or personal preference — we can safely revert the ECU to its original factory settings.

Yes. We provide a fully mobile service across South East Wales and Gloucestershire. Whether at home or work, we bring all equipment directly to you for maximum convenience.

We offer specialist solutions for AdBlue, DPF, EGR, NOx, swirl flap, and catalyst systems. These services help resolve faults, prevent limp mode, and restore drivability. Every solution is applied safely and appropriately for your vehicle.

Many customers experience improved MPG thanks to better torque delivery and more efficient power management. Economy‑focused remaps are available for drivers who prioritise fuel savings.

Most remaps take around 60–90 minutes, depending on the vehicle. Diagnostics typically take 30–45 minutes, depending on fault complexity. We always provide clear time expectations before starting any work.

Yes. All remaps come with a lifetime software warranty, ensuring your tune remains defect‑free for as long as you own the vehicle.

Absolutely. If you’re unsure, our diagnostic service can identify faults, performance issues, or emissions‑related problems. From there, we recommend the most suitable solution — whether remapping, emissions correction, or system coding.