Replacement Ecu For C3 ?

[blooka]

Hi all

I have been told I need to replace a faulty ecu on my c3 1.4 petrol 8valve 54 plate

I just want confirm that i get the correct parts for it

as i understand i need the ecu,bsi unit (is the bsi unit the one inside the car in glove box?)  ,keys and key surround is this correct?

i have seen some of these for sale used on ebay from the same model but not all of the numbers on the ecu are the same is this a problem?

first picture is original ecu

sorry for all the questions but just want to make sure i do it right

 

 

[paul.h]

Welcome to the forum.

 

Is it cheaper to replace the parts than to have your existing ecu tested and repaired ? Was it a Citroen dealer who diagnosed a faulty ecu ? There have been several cases on here where people have replaced ecus and associated parts but found their cars still did not work. Note that your car will adopt the higher mileage of your car or the replacement ecu so you will need to keep some records/receipts in case you have an insurance claim and your mileage jumps above your annual allowance. However, there may be places who will correct the mileage.

 

You should not need the key surround, this is just a detector for the immobiliser chip in the key. You can also remove the chips from the replacement keys and put them in your existing keys to save replacing all the door and ignition locks, provided the key cases can be split to replace the batteries. If you remove the batteries from the keys they will need to be initialised to the car again following the procedure in the handbook but best to avoid disconnecting the batteries until the ecu is working. As well as the ecu, bsi, keys (make sure these have the chips in them), you may also want the radio since your existing one will not work properly (might bleep) with the replacement ecu/bsi until it has a diagnostic to code the ecu/bsi to it.

[blooka]

Hi Paul
thanks for the quick reply
No it wasn't a Citroen dealer who diagnosed it as faulty ecu it was a  mechanic friend of mine
I know he has tried everything to overcome a rough idling issue.
he has swapped everything and has come to the conclusion that it must be the ecu at fault.
the issue is it wont pass the emission test. the co and hydrocarbons pass but the lambda test fails.
I just thought it may be worth a try buying a second hand one for around £75 and give that a go.
cheers
Dave

[paul.h]

Rough idling is probably unlikely to be an ecu fault. What parts have been replaced - air filter, any seals, exhaust joints checked for leaks, spark plugs, throttle plate/body cleaned, MAP sensor, fuel injectors, inlet lambda sensor and also one from a Citroen dealer used, exhaust catalyst, coolant temp sensor ? Some info here http://www.petercoopercarrepairs.co.uk/new_page_3.htm

 

You could also use a Citroen dealer with the correct diagnostic equipment to find the fault rather than spending more money on parts, hoping to find the right one before wasting too much.

[coastline taxis]

hydrocarbons is unburnt fuel and is always mostly down to the cat or an ignition component.  is your cat giving off an egg/sulphur smell  and did he check all the sensors with a multi meter. Also a split vacum pipe would cause this, are there any codes coming up