MD1CS003 AdBlue (SCR) Removal Emulator

The Bosch MD1CS003 engine control unit is found across a wide range of PSA/Stellantis diesel cars and light commercial vehicles — Citroën, Peugeot, Opel, DS, Fiat, and Toyota Proace among them. These vehicles typically operate in heavy stop-start urban traffic, which puts constant pressure on the SCR system: NOx sensor drift, urea dosing pump errors, AdBlue (DEF) quality warnings, and DEF level faults accumulate and eventually force the ECU to restrict engine power, impose a speed cap, and push the vehicle into limp mode. The MD1CS003 AdBlue (SCR) Removal Emulator tackles all of these SCR-related fault groups with a single plug-in device, delivering a permanent, reversible electronic solution without any remapping or software changes.

How Does It Work?

The emulator plugs directly into the vehicle's MD1CS003 ECU connector using the existing socket — no wire cutting, no soldering, no permanent changes to the wiring loom. Once connected, it simultaneously feeds the ECU valid upstream and downstream NOx sensor signals, AdBlue dosing pump feedback, and urea tank level, temperature, and DEF concentration data, all within the ranges the MD1CS003 brain expects. The control unit reads all inputs as healthy, so it does not log fault codes, does not activate forced regeneration cycles, and does not engage power restriction or limp mode. Removing the device returns the vehicle to its factory configuration instantly.