Seat Leon 1.8 20v 125
ECU Remapping
Seat Leon 1.8 20v 125. Standard and remapped figures for this exact engine.

- Fully dyno tested remaps
- 30 day money back guarantee
- Lifetime software warranty
- UK-wide local network
Remap stats
Seat Leon 1.8 20v 125: standard vs remapped
Petrol engine. Indicative stage 1 figures, fully dyno tested.
Power
+17 bhp · +14%- Standard125 bhp
- Remapped142 bhp
Torque
+50 Nm · +29%- Standard170 Nm
- Remapped220 Nm
Tuning figures are indicative estimates, not guaranteed results. Actual results depend on the condition of the vehicle.
Prices from £130
Fully dyno tested | 30 day money back guarantee | Lifetime software warranty
What does a remap do for the Seat Leon 1.8 20v 125? Our figures show power up from 125 to 142 bhp (+14%) and torque up from 170 to 220 Nm (+29%), a stage 1 result you can book across the UK.
Treat the numbers as a guide: they are stage 1 estimates for a petrol Seat Leon in sound condition, and individual cars differ.
Seat Leon 1.8 20v 125: remap at a glance
- Fuel: Petrol
- Standard power: 125 bhp, remapped: 142 bhp (+17 bhp, +14%)
- Standard torque: 170 Nm, remapped: 220 Nm (+50 Nm, +29%)
- Service: stage 1 ECU remap, fully dyno tested
Petrol Seat Leon: what changes with a remap
On a petrol car the ECU controls fuelling, spark timing and any turbo boost. A remap re-calibrates those maps within safe limits, so the car responds more eagerly and pulls harder through the rev range.
Seat Leon 1.8 20v 125 against other Leon engines
Ranked by power gain against the other petrol Leon engines (13 in total), the 1.8 20v 125 is 11th, 15 bhp below the Leon petrol average of 32 bhp.
Across our whole catalogue the average petrol remap adds 27 bhp and 51 Nm, so this engine's 17 bhp and 50 Nm sits below that benchmark.
Book performance tuning for your Seat Leon
Our network covers the whole of the UK through local Remap Experts sites. Find your area to get a quote from a specialist near you.
Every remap is fully dyno tested and comes with a 30 day money back guarantee and a lifetime software warranty. Call 0800 779 7864 for a quote.

Get a quote for your Seat Leon 1.8 20v 125
Tell us about your car and we will come back with a quote by SMS or phone.
Included
What we can do for your Seat Leon
Stage 1 ECU remap
Add power and torque and improve driveability. Software only, tailored to your engine.
ECU repair and testing
Is your engine control unit playing up? We can arrange testing and repair, and source replacement ECUs.
DPF and EGR fault repair
Persistent DPF or EGR errors diagnosed and resolved in accordance with all current road-legal standards.
Engine carbon cleaning
Fault finding and carbon cleaning for the inside of your engine, typically completed in a couple of hours.
Same model
Other Leon engines
- Seat Leon 1.4 TSI 125 (+2005)petrol
- Seat Leon 1.4i 16v 85 (+2005)petrol
- Seat Leon 1.6 102 (+2005)petrol
- Seat Leon 1.6 I 16v 105petrol
- Seat Leon 1.8 T 180petrol
- Seat Leon 1.8 T 20v 225petrol
- Seat Leon 1.8 T Cupra R 20v 210petrol
- Seat Leon 1.8 TSI 160 (+2005)petrol
- Seat Leon 1.9 Sdi 68diesel
- Seat Leon 2.0 FSI 150 (+2005)petrol
- Seat Leon 2.0 TFSI 185 (+2005)petrol
- Seat Leon 2.0 TFSI 200 (+2005)petrol
From quote to remapped in four steps
No jargon and no pressure. Here is exactly what happens.
- 01
Find your vehicle
Choose your make, model and engine to see the standard and remapped power and torque for your car.
- 02
Request a quote
Send your details and we contact you by SMS or call back with a quote. No obligation.
- 03
Book with your local site
Your local Remap Experts site arranges the remap and answers any questions about your car.
- 04
Remapped and dyno tested
Your remap is fully dyno tested, with a 30 day money back guarantee and a lifetime software warranty.
Everything you need to know
Plain-English guides to how remapping works, what it does and what to check first.
- 6 min read
What is ECU remapping?
The engine control unit, what a remap changes, and who it suits.
Read guide - 5 min read
The benefits of ECU remapping
More torque, better driveability and the potential for better economy.
Read guide - 6 min read
How ECU remapping works, step by step
From reading the original software to the dyno test.
Read guide