Original file
Original / Factory · Petrol · 35 AMG 306hp
MB S 500 original file Bosch HW 0261208920 · A1131538679 · SW 365376
Mercedes-Benz S 500 Petrol 225.1 kW (306 HP) Original2005, Petrol, 225.1 kW (306 hp)
306 HP Factory calibration Stock backup file, 400 Nm, Petrol
Calibrated ECU file for 0261208920 (SW 365376). Checksum-corrected, ready to flash. Delivered instantly via secure download after payment.
Performance projection
Matched engine: 35 AMG 306hp, 2L, Petrol. Engine #4523 in our gains database.
- Power
- 306 HPfactory calibration
- Torque
- 400 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 0261208920 and software 365376.
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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, Petrol.
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 | Mercedes-Benz |
|---|---|
| Vehicle model | S 500 |
| Model year | 2005 |
| Fuel / Induction | Petrol |
| Factory power | 225.1 kW (306 HP) |
| ECU manufacturer | Bosch |
| ECU hardware | 0261208920 |
| ECU software | 365376 |
| Calibration stage | Original (Factory) |
| OEM engine code | 35 AMG 306hp |
| 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 | 306 HP | 400 Nm | — | — |
| Stage 1 | 330 HP | 490 Nm | +24 (7.8%) | +90 |
| Stage 2 | 350 HP | 515 Nm | +44 (14.4%) | +115 |
| Stage 3 | 505 HP | 620 Nm | +199 (65%) | +220 |
| Stage 4 | 597 HP | 740 Nm | +291 (95.1%) | +340 |
About this calibration file
This is the factory (original) ECU calibration for the 2005 Mercedes-Benz S 500 Petrol, 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 0261208920 and software version 365376. 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
0261208920 (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 MB S 500 2005 Benzin 225.1KW with Bosch 0261208920 and software ID A1131538679 (Bosch software number 365376 ( 1037365376 )). This original file corresponds to a factory engine output of approximately 225.1 kW (~306 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 0261208920, A1131538679, 365376 (1037 + SW code). Use this file for diagnostics, cloning, recovery or as a base for custom remapping.
98B39317 7F238ACA 6D84EB8F CD7FDEFB B04D1989 93180457 A5127D6A 7A491CB5