How to Read and Write PSA SID807 ECU using Flex Tool
We’ll walk through the process of reading and writing the SID 807 ECU in a 2011 Citroen C4 1.6L Diesel (110 HP / 82 kW) using the FLEX programming tool . This demonstration covers OBD-based tuning , including how to disable Start-Stop functionality — a common request from vehicle owners. Tools & Preparations FLEX Programming Tool (OBD connection) Battery Maintainer (recommended for stable voltage) Citroen C4 SID 807 ECU (2011 model in this case) Note: Always verify the ECU hardware number before proceeding. If unsure, the FLEX tool can auto-detect the correct ECU type. Step-by-Step Procedure 1. Identify the ECU The FLEX tool allows you to manually input the vehicle details ( Citroen C4, 1.6 Diesel, SID 807 ) or automatically detect the ECU. If the wrong ECU is selected, the tool won’t establish a connection , preventing accidental errors. 2. Read the ECU via OBD Connect the FLEX tool to the OBD port (which, in French cars, can be tr...