Stage 4
Audi A3 1.8T 20V Stage 4 file Bosch HW 0261204254 · 06A906018D · SW 357459
Audi A3 1.8T 20V Turbo Petrol Stage 4Turbo petrol
Calibrated ECU file for 0261204254 (SW 357459). Checksum-corrected, ready to flash. Delivered instantly via secure download after payment.
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 0261204254 and software 357459.
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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: Stage 4.
Hardware
- Built / forged engine internals
- Large performance turbocharger
- Uprated HPFP + race-spec injectors (often dual-pump)
- Race intercooler + chargecooler upgrade
- Full performance exhaust
- Reinforced clutch / uprated gearbox
- Optional: E85 / methanol fuel system
Software / calibration
- Fully bespoke calibration: typically dyno-tuned on installed hardware
- Fuelling rebuilt around race injectors / HPFP / E85 blend
- Boost, ignition / injection timing and lambda targeted to the build
- Closed-loop safeties retuned around the actual hardware envelope
Stage 4 is a fully built setup: figures shown are a typical envelope. The file is dyno-tuned to your specific hardware spec.
Vehicle & ECU specifications
Exact vehicle, engine and ECU identifiers this calibration file is written for. Cross-check against your ECU before flashing.
| Vehicle make | Audi |
|---|---|
| Vehicle model | A3 1 8t |
| Fuel / Induction | Petrol |
| ECU manufacturer | Bosch |
| ECU hardware | 0261204254 |
| ECU software | 357459 |
| Calibration stage | Stage 4 |
| File format | BIN / ORI |
| Checksum | Pre-corrected (ready to flash) |
| Delivery | Instant download after payment |
About this calibration file
The Stage 4 calibration for the Audi A3 1 8t Petrol is a built-engine tune. It assumes forged internals, large-frame turbo, upgraded transmission or clutch, and a standalone pre-tune dyno pass. The file is meant as a safe starting map for a professional tuner's in-car refinement.
This file matches a Bosch ECU with hardware number 0261204254 and software version 357459. 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
0261204254 (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 calibrated Stage4 tuning file for Audi A3 1.8T 20V Turbo-Benzin KW with Bosch 0261204254 and software ID 06A906018D (Bosch software number 357459 ( 1037357459 )). This high-stage file targets heavily modified setups (bigger turbo, injectors etc.) and should be used by experienced tuners only.
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 0261204254, 06A906018D, 357459 (1037 + SW code). Use this file for diagnostics, cloning, recovery or as a base for custom remapping.
2C901784 F3767C94 59C3F6C5 28D51985 E0BC3AE3 C2358F99 0472E3B5 32BB72C7