How do ypu reset the ecu's on a 2008 citroen c5 1.6l diesel?

Hi, firstly, why do you want to reset your ecu? If you have had a fault error, then a session on a Lexia would be the way forward. some apps on mobiles with a blue tooth dongle can reset some codes. However, on my 2.0 HDi estate, can be reset by turning the ignition key to on (before actual start) and off 12 times sometimes works. Also I have followed the instruction on the Frenchcar forum, as follows;
ignition off - lights on - remove battery terminals - the wired tails (no battery) short together, this discharges the ecu - light off - reconnect the battery - reset the time clock - radio stations - electric windows. If you are near the North West,I have Lexia kit.
Hope this helps.

Mick H
April 2014

OBD2 scanners and elm327 readers are cheap and work.look on Ebay.some codes do delete with battery disconnect on some cars but hit and miss

Steve
February 2014

I very much doubt it,if you have had a fault and repaired it then it will probably need to go onto a good code reader to delete your faults and your m.i.l.

cdc
February 2014