Remap files for 4JXX ECU
45 files available
About remapping
The 4JXX is one of the most widespread engine control units, fitted by many manufacturers. We have 45 remap files for the 4JXX, present across 14 make and model combinations.
If you work with the 4JXX in your workshop, here's an at-a-glance view of which vehicles use it and which services (Stage 1/2, EGR, DPF, AdBlue…) are available. Every file is built from the original and is reversible.
Vehicles with this ECU
Available services
Remapping services
Stage 1
Optimising the original map with no hardware changes: more power and torque, full reliability.
EGR off
EGR valve management to reduce soot issues and improve response.
DPF off
Particulate filter solution: no more regenerations or blockage warnings.
DTC delete
Clearing of fault codes (DTC) that can't be removed via diagnosis.
AdBlue/SCR off
AdBlue/SCR system management to avoid faults and lock-outs.
Why remap with Repromatronic
- ✓More power and torque with engine-safe tuning
- ✓Sharper throttle response and nicer driving
- ✓Potential fuel savings in normal driving
- ✓Files built from the original and 100% reversible
- ✓Made by technicians with thousands of projects behind them
Are you a driver?
Request a free quote for your vehicle and we'll tell you the gains you can expect.
Request a quoteAre you a workshop or professional?
Sign up, buy credits and download the optimised file instantly.
Log in as a professionalFrequently asked questions
How many remap files are there for 4JXX?
We currently have 45 files for 4JXX, ready to download or request. The library grows constantly with new projects.
Which services can be applied to 4JXX?
Depending on the engine: Stage 1 and Stage 2 power tuning, EGR, DPF and AdBlue/SCR off, speed-limiter removal, pops & bangs and DTC delete. Each entry shows exactly what is available.
Is 4JXX remapping reversible?
Yes. We always keep the original file, so the vehicle can be returned to factory state at any time.
How much power do you gain remapping a 4JXX?
It depends on the engine, but a Stage 1 remap usually adds 15–30% more power and torque, always within the engine's safe limits. We give you the exact figures for your engine when you request a quote.
Does remapping affect fuel economy or reliability on a 4JXX?
A proper remap improves throttle response and can reduce consumption in normal driving. We always work within the engine's limits to keep reliability.
I'm a driver / a workshop — how do I get my 4JXX file?
Drivers can request a free, no-obligation quote. Workshops and professionals sign up, buy credits and download the optimised file instantly.