Mercedes 400D Remap & Chiptuning – E400d, S400d, GLE 400d

Professional ECU tuning and remapping for the Mercedes 400D diesel engine. Our dyno-tested Stage 1 calibrations improve torque delivery, throttle response and drivability, with optional DPF, EGR and AdBlue/SCR solutions for supported ECUs.

Engine codes: OM656 2.9 I6

Fitted to E400dS400dGLE 400d

+33 hp Best Stage 1 power gain

+69 Nm Best Stage 1 torque gain

1 ECU variant covered

Diesel Fuel type

Performance Gains (Dyno-Tested)

Engine	Stock	Tuned	HP Gain	Torque Gain	ECU	Order
400D	330 hp	363 hp	+33 hp +10%	+69 Nm	MD1CP001Stage 1	Order file →

Figures are dyno-tested averages and may vary with hardware condition and fuel quality.

Cars this engine is fitted to

E400d, S400d, GLE 400d, Mercedes CLS400d C257, Mercedes G, Mercedes G400d and 1 more

Mercedes · 7

CLS400d C257E400dGG400dGLE 400dGLE400dS400d

Fitment is read from the ECU part numbers in our own database, not from a generic catalogue. The same engine and control unit are fitted to several cars, which is why one page serves them all.

Measured here, tunable everywhere

The figures in the table above are readings taken on the dyno for this engine, not software estimates rounded up to sell a file, and our Stage 1 is calibrated to stay inside the margins the engine was designed with. Only a part of our work is published this way: every ECU, engine and model we can read can be remapped for power, measured page or not.

Available ECU Services for this Engine

The following solutions are supported on the ECU(s) of this vehicle (Diesel):

AGS Removal AdBlue DPF DTC Removal EGR Flaps/Swirl Removal Readiness Calibration StartStop Disable Torque Monitoring Disable

Technical Notes per ECU

Disconnection and read requirements differ by ECU. The notes below apply to the specific ECU listed; the exact removal scope per service is confirmed on each service page.

MD1CP001

EGR off ACTUATOR PLUG MUST BE DISCONNECTED

DPF off DPF PRESSURE AND TEMPERATURE SENSORS MUST BE DISCONNECTED

AdBlue/SCR off ADBLUE ECU MUST BE DISCONNECTED

Each note is tagged with the service it refers to and applies to the ECU it is listed under. Mechanical preparation is the installer's responsibility. Emission-related solutions are for off-road or motorsport use where permitted by law.

Supported ECU(s): MD1CP001

Frequently Asked Questions

How much power can a Mercedes 400D gain with Stage 1 tuning?

Stage 1 ECU tuning for the Mercedes 400D can add up to +33 hp and +69 Nm of torque, based on dyno-tested calibrations. Actual figures depend on the exact engine variant and hardware condition.

Can DPF, EGR and AdBlue/SCR be removed on the Mercedes 400D?

DPF, EGR and AdBlue/SCR off is supported on the ECU(s) of this vehicle, strictly for off-road or motorsport use where permitted by law. The exact mechanical preparation and sensor handling are listed per ECU in the technical notes below.

How do I order and how fast is the tuning file delivered?

Upload your original ECU read through the tuning page and receive the calibration by email. Most files are delivered within 15-20 minutes during working hours (daily, 07:00-23:00 CET).

Is the Mercedes 400D tuning file plug-and-play?

You receive a ready-to-flash calibration based on your original file. Flashing it back to the ECU and any related mechanical preparation are handled by the installer with their own tools.

Order your Mercedes 400D tuning file

Upload your original ECU file and receive a professional calibration in 15-20 minutes.

Tune Your File →

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