Hello, I bought myself a car. Citroen c5 x7 156thp 2011. VIN: VF7**************[VIN obfuscated, can be read by forum staff]. The seller of the car lives +300km away and his car broke down in my town. The local repair shop examined the car and stated that the 2nd cylinder injector is broken, it is leaking through. The owner managed to get another ride home and wanted to get rid of this car quickly. They put it up for sale for €500, I bought it right away!
New Bosch injectors seemed to cost €65/each so I bought all 4 pcs. The injectors were annoying to change, there was really little space. I didn't want to remove the intake manifold completely so I just dropped it between the firewall and the engine. The idea was to remove the fuel rail from the injectors and then the injectors last. But the injectors were really stuck to the fuel rail, I had to remove them all as one package. Due to the limited space I was afraid I would damage the injector tips. Luckily in my case the old injectors will never be used again so it doesn't matter if there is a little damage. I cleaned the nozzle holes carefully and put a little silicone spray on the nozzle tip seals and the o-rings themselves. I could only see the injectors in the mirror and had to sit on my knees on top of the engine during the entire repair. After changing the injectors, I also changed the sparkplugs, engine oil and filter because they smelled strongly of gasoline. I tried to start the car for the first time during my ownership. The car started fine and ran well. The car smoked heavily for a while, which was caused by the exhaust system and engine being wetted by the leaking injector.
- Fuelrail and Injectors.
- Looking injector
I also noticed that there was a slight exhaust pipe leak sound coming from the turbo and the turbo was very sooty on the outside. I opened the exhaust manifold heat shields and noticed that the connection between the turbo and the exhaust pipe was loose. One of the mounting nuts had fallen between the heat shield, the other was fingertight and the third was moderately tight. I retightened everything and it started to hold. When I examined the turbo, I noticed that it looked pretty new. According to the service book, it was replaced for the first time on 02.10.2019. 189009km and for the second time on 23.08.2023. 226935km (the intake pipe was replaced at the same time). I don't know why it was replaced twice, whether the first one was a cheap part or a used one, I don't know... The turbo's intake wings were slightly bent, and there was a little oil in the intake pipe. Did the intake pipe break let extra stuff into the pipe and damage the intake wings, or did the breather freeze and the loose ice go through the turbo? (Finland has cold winters). I was thinking of replacing the breather with a new one as a spare. Unfortunately, you can't get it separately, you have to buy the whole valve cover. My valve cover leaks a little oil, so it has to be removed anyway. The new part costs less than 100€, so it's not expensive.
- Loose nuts
- wings
When I checked the fault codes, the parking assist had a fault code. ABC1 (distance sensor, front left inside, short circuit to positive). ABC2 distance sensor, front right outside, short circuit to positive) and 9BCA (distance sensor, front left outside, probabilistic logic). So I think I have two broken sensors. I swapped the middle sensors and the error code changed from ABC1 -> ABC3 (front right inner) so I think my conclusion is correct. I'll order new ones and replace them.
There were a lot of fault codes in the Engine Control due to a broken injector. All the others went away and stayed away except for two fault codes, both were the same, U1218 CAN communication with component (central electronics) illogical value. This is what I need to start investigating next, apparently there could be some connector fault, wiring fault or oxidation in the direction of the engine fuse box? Does anyone know better where I should start looking for the problem?
