I use a 2012 C4 and it's the same parts as the 308. Last year the fuse box cover wasn't fully closed and water got in. The wipers started coming on by themselves, the fault lights started turning on, the signals and cruise control stopped working, and it started giving different faults. The electronics technician checked and installed a used fuse box and everything went back to normal. 6 months later, the same faults happened again and he said the box was installed because of it. A few days later, the same fault happened again and I left the car alone for 2 weeks and they didn't even look at it properly and said it was the same box and they installed a different fuse box. This time it said engine failure and the service light was on. I got angry and went and bought a new one with the code on the registration document and installed it myself. Then the wipers didn't work and the fog lights didn't work and it still said engine failure and the service light was on. My mechanic said it needed coding for a new fuse box. Since the authorized service center doesn't sell the parts themselves, they want 1.5 times the price of the part just for the coding and say they won't give a warranty if something happens to the car. The electronics technicians say they won't do this or that. Nobody knows anything and they use it as a test bed. I've spent 16,000 TL so far and haven't found a solution and I've been without a car for 3 weeks. If anyone knows the solution, please share it. Yesterday, even though there was a new fuse box, the headlights turned on by themselves. I'm going crazy again.
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