Original file
Original / Factory · Diesel · 2.0 TDI 184hp
Seat Leon 2.0 TDI Ecomotive original file Bosch · 04L906021EL · SW 541538
Seat Leon 2.0 TDI Ecomotive Turbo Diesel 135.3 kW (184 HP) OriginalTurbo diesel, 135.3 kW (184 hp)
184 HP Factory calibration Stock backup file, 380 Nm, Diesel
Calibrated ECU file for 04L906021EL (SW 541538). Checksum-corrected, ready to flash. Delivered instantly via secure download after payment.
Performance projection
Matched engine: 2.0 TDI 184hp, CUNA /CUPA, 2L, Diesel. Engine #6856 in our gains database.
- Power
- 184 HPfactory calibration
- Torque
- 380 Nmfactory calibration
Real data from Gains API. Dyno curve = typical ECU-family projection. Final gains depend on fuel, altitude, wear.
How it works
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Read your ECU
With KESS, KTAG, AutoTuner or Flex. Keep the read: it is your way back.
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Match the numbers
Your read must show hardware 04L906021EL and software 541538.
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Pay and download
Card, Apple Pay or Google Pay. The file is in your account straight away.
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Write it and drive
Write it back the way you read it. Not right for your car? We correct it free.
What the car needs
Required modifications: Factory, Diesel.
Hardware
- Factory hardware: no modifications required
Software / calibration
- OEM calibration restored (recovery / immobiliser / coding work)
Original files are used to revert to factory state, repair after a faulty tune, or recover an ECU before service work.
Vehicle & ECU specifications
Exact vehicle, engine and ECU identifiers this calibration file is written for. Cross-check against your ECU before flashing.
| Vehicle make | Seat |
|---|---|
| Vehicle model | Leon |
| Displacement | 2.0 L |
| Fuel / Induction | Turbo Diesel |
| Factory power | 135.3 kW (184 HP) |
| ECU manufacturer | Bosch |
| ECU hardware | 04L906021EL |
| ECU software | 541538 |
| Calibration stage | Original (Factory) |
| OEM engine code | CUNA /CUPA |
| File format | BIN / ORI |
| Checksum | Pre-corrected (ready to flash) |
| Delivery | Instant download after payment |
Engine performance matrix
Power, torque and fuel-economy figures for every tuning stage on this engine, sourced from the tuning-database Gains API. Values are healthy-engine crank numbers; real on-road gains vary with fuel, altitude and mechanical condition.
| Stage | Power | Torque | Δ HP | Δ Nm |
|---|---|---|---|---|
| Original / Factory | 184 HP | 380 Nm | — | — |
| Stage 1 | 225 HP | 460 Nm | +41 (22.3%) | +80 |
| Stage 2 | 261 HP | 559 Nm | +77 (41.8%) | +179 |
| Stage 3 | 276 HP | 589 Nm | +92 (50%) | +209 |
| Stage 4 | 331 HP | 703 Nm | +147 (79.9%) | +323 |
About this calibration file
This is the factory (original) ECU calibration for the Seat Leon 2.0L Turbo Diesel, extracted from a genuine stock control unit. Use it as a verified backup before flashing any performance tune, or as a reference when recovering an ECU from a failed write.
This file matches a Bosch ECU with hardware number 04L906021EL and software version 541538. Verify both identifiers in your flashing tool before writing — an ID mismatch is the most common cause of a bricked ECU. If you are unsure, upload a read of your original file via the file-request wizard and our engineers will confirm compatibility before you flash.
The file is delivered as a ready-to-flash BIN (and ORI backup where applicable) compatible with all major tools — KESS V2/V3, KTAG, AutoTuner, CMDFlash, Dimsport New Genius, MPPS, Flex, BFlash, PCMFlash, MMFlash — via OBD, bench or boot-mode as supported by your ECU family. Checksums are pre-computed and verified; no additional checksum tool is required. All files include a free revision if post-flash logs reveal a fuelling, boost or EGT issue.
Frequently asked questions
04L906021EL (Bosch) listed in the specifications. Read your ECU with any supported tool (KESS, KTAG, AutoTuner, CMD, etc.) and compare the hardware + software numbers against the ones on this page. If they match exactly, the file is a direct fit. If you're not 100% sure, upload your original read via the file-request wizard and our engineers will confirm within minutes — no cost, no obligation.Product details
This product contains a complete original ECU backup (stock file) for Seat Leon 2.0 TDI Ecomotive Turbo-Diesel 135.3KW with Bosch 04L906021EL (Bosch software number 541538 ( 1037541538 )). This original file corresponds to a factory engine output of approximately 135.3 kW (~184 HP). This file is ideal for ECU cloning, restoring the car back to stock and using it as a safe base for future remaps.
All ECU tuning files from TUNING-DATABASE are prepared for professional use. They are useful whenever you search by ECU ID, hardware or software number such as 04L906021EL, 541538 (1037 + SW code). Use this file for diagnostics, cloning, recovery or as a base for custom remapping.
7D42EF7F C158F3AF 31187471 9074934C 49881922 1B79BDF7 C47E0034 CC4B8E2E