How to Check a PSA MD1CS003 ECU is Locked or Not?

By | September 17, 2026

Question:

It’s a Peugeot Partner 1.5 132hp with Bosch MD1CS003 ECU.

Car build date is 2020/06. Try to read this ECU with Flex programmer.
How do i know if ecu needs to be boot glitched or not?
Is there any danger of trying to connect and reading on non locked protocol if ecu requires boot glitch?

flex psa md1cs003 locked or not

Here is the clue.

How to determine whether the MD1CS003 ECU is locked or not?

Way 1:

Just try normal bench read and you will know if its blocked. If locked then flex tell you.

 

Way 2:

Check the ECU label.
If 0281 034, 035 or 036 it’s not locked.
Also, 0281 037 101 not locked.
If more than “037” is locked.

flex psa md1cs003 locked or not 2

FYI:

How to determine the TPROT lock status of PSA MD1CS003:
It can be quickly determined based on the part number.
Part numbers starting with 3XX indicate not locked;
those starting with 4XX or 5XX indicate a locked state, requiring an unlocking operation before normal data reading and writing can be performed.

tprot lock status of PSA MD1CS003