Your Vehicle
Seat Leon 1.4 TSI 125hp
Technical Specifications
Power and torque increase
Stage 1: software remap only, no mechanical changes, fully reversible.
Stage 1: file 100 € online + installation 350 € at the workshop (via the OBD port) Book now
Power HP
Torque Nm
Buy the Stage 1 file, pay the installation at the workshop
100 € VAT included: the file developed for your engine, paid online
Installation: 350 € network price, the workshop may charge less, paid at the chosen workshop (via the OBD port) · terms
Power Graph
Seat Leon 1.4 TSI 125hp: da 125 a 155HP
Remapping Seat Leon
MasterTuning develops remapping for Seat. La Seat Leon 1.4 TSI 125hp può passare da 125 HP a 155 HP con un incremento di 30 HP.
The development of each remap is customized by MasterTuning.
- 100% customised files with lifetime warranty
- Reference values for Stage 1: the file is developed on your vehicle and checked in the workshop
- Best performance, within safety margins
- Reduced fuel consumption
ECU Remapping Details Seat Leon 1.4 TSI 125hp
The Seat Leon 1.4 TSI 125hp is equipped with a petrol engine that produces 125 HP and 200 Nm of torque in its factory configuration. With MasterTuning's professional ECU remapping, this Seat can achieve 155 HP (+24%) and 270 Nm (+35%).
Our Stage 1 tuning for the Leon 5F MK2 - 2017 - 2019 delivers an impressive gain of +30 HP and +70 Nm, optimizing the petrol engine's performance while maintaining reliability and staying within safe parameters.
The engine code CAXC identifies this specific powerplant configuration. The Bosch MED17.5.20 / Bosch MED17.5.5 ECU is professionally recalibrated to unlock hidden potential while preserving engine longevity.
The Leon's petrol engine benefits significantly from professional ECU calibration. The result is a more responsive, enjoyable driving experience with improved power delivery throughout the rev range.
Technical Specifications — Seat Leon 1.4 TSI 125hp
Factory technical data for the Seat Leon 1.4 TSI 125hp (5F MK2 - 2017 - 2019), used by MasterTuning engineers to develop a remap tailored to this specific powerplant. Figures shown are reference values for Stage 1; the file is developed on your vehicle and checked in the workshop.
| Engine code | CAXC |
|---|---|
| ECU / Control unit | Bosch MED17.5.20 / Bosch MED17.5.5 |
| Fuel | Petrol |
| Compression ratio | 9.7 |
| Bore × stroke | 76.5 X 75.4 mm |
| Stock power | 125 HP · 200 Nm |
| Remapped power (Stage 1) | 155 HP (+30) · 270 Nm (+70) |
Don't want to touch the ECU?
Rapid Dimsport add-on modules connect to the engine sensors with original connectors: they fit in a few hours and come off without a trace, leaving the factory software untouched. Useful on a leased car, one still under warranty or one you plan to sell soon. Check which ones fit your Seat Leon.
Frequently Asked Questions - Seat Leon
How much power can I gain from remapping my Seat Leon?
With MasterTuning Stage 1, your Seat Leon 1.4 TSI 125hp can gain +30 HP (from 125 to 155 HP) and +70 Nm of torque. This represents a 24% increase in power.
Which ECU does the Seat Leon 1.4 TSI 125hp use?
The Seat Leon 1.4 TSI 125hp uses the Bosch MED17.5.20 / Bosch MED17.5.5 engine control unit. MasterTuning recalibrates this ECU for Stage 1 and Stage 2.
What is the engine code of the Seat Leon 1.4 TSI 125hp?
The engine code of the Seat Leon 1.4 TSI 125hp is CAXC. You can find it in the vehicle documents or on the engine plate.
Is ECU remapping safe for the Seat Leon engine?
Yes, MasterTuning's remapping for the Seat Leon 1.4 TSI 125hp is developed within safe parameters. Each file is developed on your vehicle, checked in the workshop and stays within the mechanical limits of the CAXC engine.
Is the Seat ECU remapping reversible?
Absolutely. The original factory calibration of your Seat Leon is always backed up before remapping. The process is 100% reversible at any time.
Will remapping affect my Seat warranty?
ECU remapping may affect your manufacturer warranty. We recommend checking your specific warranty terms. Many of our customers choose to remap after the warranty period or accept this trade-off for the significant performance gains.
Other Remaps You Might Like
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Book your remap or ask for a quote
Stage 1 can be bought online and is done at the workshop you choose; for Stage 2 we send you a quote.
Stage 2 is quoted on request: write to us and we will reply with price and timing.
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