1.5 BlueHDi AdBlue Fault Solution and Chip Tuning: Bosch MD1CS003
The 1.5 BlueHDi is the most common diesel in Peugeot, Citroën, Opel, Toyota and DS models. On these new engines the ECU is the locked Bosch MD1CS003. AdBlue warnings, NOx sensors and DPF faults are the top complaints. A wide range of MD1CS003 solutions is available at ECU Prime.
What is available on the MD1CS003?
- Stage 1: power and torque software; can be combined with AdBlue, EGR or emission solutions in one file.
- AdBlue / SCR and NOx: AdBlue warnings, countdown and NOx sensor faults.
- DPF, EGR, lambda and TVA: emission package and individual solutions.
- Speed limit (Vmax): speed limiter adjustment on commercial models.
Which cars use the MD1CS003?
1.5 BlueHDi models such as the Peugeot 208, 2008, 308, 3008, 508, Rifter, Citroën C3, C4, C5 Aircross, Berlingo, Opel Astra, Combo, Grandland and Toyota Proace City, Proace. Some model years use a different ECU; confirm from the label.
How is it read and written?
The MD1 family ships locked; reading needs the ECU to be unlocked with the right method. Autotuner’s March 2026 update reads and writes 2020+ MD1CS003 units on the bench after unlock; Magicmotorsport Flex 8.23 (September 2026) unlocks them by boot glitch without removing components, then works on the bench. Workshops can upload files read with these tools to the ECU Prime file service.
The ECU type depends on model year and engine. The exact type is confirmed from the ECU label or by reading it with a diagnostic tool; send a photo of the label on WhatsApp and we will tell you which file applies.
Common faults
- AdBlue warning and “engine will not start in X km” countdown
- NOx sensor and AdBlue pump / heater failure
- DPF loading and endless regeneration on short trips
- Sooted EGR valve and loss of pulling power
MD1CS003 ECU page · Peugeot AdBlue fault solution · Citroën AdBlue fault solution · Opel AdBlue fault solution
How it works
- Reading: upload the original file read with your tool, or visit one of our locations.
- Calibration: the file is prepared for the exact engine and ECU software version, checksum corrected; the original is archived.
- Application and check: fault scan and run / road test after writing.
Workshops get the same solutions through the ECU Prime file service.
Emission-related software is offered only for uses permitted by applicable law (off-road / closed-site use, racing, export, diagnostics); road use and inspection compliance are the owner’s responsibility.