Vehicle Tuning, Diagnostics & Performance Services

Serving Newport, Chepstow, Monmouth, Cheltenham, Gloucester & Surrounding Areas

At Extech Tuning, we provide professional vehicle tuning, diagnostics, performance upgrades, and advanced security solutions for cars and vans across Newport, Caldicot, Chepstow, Monmouth, Cheltenham, Gloucester, Bristol, and all surrounding areas. Whether you want more power, improved fuel economy, reliable fault‑finding, or enhanced vehicle protection, our specialist team delivers dealer‑level precision with proven results.

Explore our full range of services below.

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Services

Vehicle Checker

SERVICES

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Vehicle Solutions

AdBlue • DPF • EGR • NOx • Swirl Flaps • Catalysts

Starting from £180

We provide expert solutions for common diesel and emissions‑related issues that affect performance, reliability, and fuel economy. These faults often trigger limp mode, warning lights, or reduced engine efficiency.

Our services include:

  • AdBlue solutions for fault correction and system reliability

  • DPF cleaning, regeneration & diagnostics

  • EGR solutions for improved engine efficiency

  • NOx sensor diagnosis & replacement

  • Swirl flap repairs or safe removal

  • Catalyst efficiency testing & fault resolution

We ensure optimal performance without compromising safety or drivability.

DPF Cleaning
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Vehicle Diagnostics

Starting from £70

We use dealer‑level diagnostics equipment to accurately identify faults across all vehicle systems. Covering petrol, diesel, and hybrid, we provide clear fault explanations and repair recommendations.

Diagnostics include:

  • Engine management

  • Transmission & drivetrain

  • ABS, traction control & stability systems

  • Airbag & safety modules

  • Electrical faults & wiring issues

  • Live data monitoring

  • Coding & programming

Mobile diagnostics available across Newport, Chepstow, Monmouth, Cheltenham, and Gloucester.

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performance & economy remapping

Starting from £250

Unlock your vehicle’s full potential with performance and economy ECU remapping. Every map is dyno‑tested, providing proven, reliable gains in power, torque, and drivability. Our remaps are built from trusted, well‑established tuning files, ensuring consistent results without compromising engine safety or longevity.

Benefits include:

  • Increased horsepower & torque

  • Improved throttle response

  • Smoother power delivery

  • Better fuel economy

  • Reduced turbo lag

  • Enhanced towing performance

  • Safer overtaking power

We tune most makes and models, including BMW, Audi, VW, Ford, Mercedes, Vauxhall, Land Rover, and more.

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Vehicle Security Systems

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We supply and install advanced vehicle security systems across Newport, Chepstow, Monmouth, Cheltenham, and Gloucester. Our solutions include GPS trackers, insurance‑approved immobilisers, and high‑quality dash cams for added protection and evidence in the event of accidents or theft. Features include motion alerts, remote monitoring, anti‑theft protection, and discreet professional installation.

Find out more here
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  • We serve Newport, Caldicot, Chepstow, Monmouth, Cheltenham, Gloucester, Bristol, and surrounding areas.

  • Yes — we provide mobile diagnostics, tuning, and security installations across our full service radius.

  • Economy maps typically improve MPG by 8–15%, depending on driving style and vehicle condition.

More FAQs
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  • Yes — all of our work includes aftercare support, and many services come with a warranty depending on the type of tuning or repair carried out. We provide clear guidance on what’s covered, how long the coverage lasts, and any maintenance recommendations to keep your vehicle performing at its best. If you ever experience an issue after a service, simply contact us and we’ll arrange a follow‑up inspection.

  • Yes — we diagnose and resolve AdBlue, DPF, EGR, NOx, and catalyst issues.

  • Yes — we supply and install Thatcham‑approved trackers and immobilisers.