I have a 2006 Peugeot 307, a 1.6 HDi turbo diesel, and the engine malfunction indicator light was on. To reset the problem, I disconnected the battery terminals, waited a while, and then reconnected them. After this, the engine malfunction indicator light went off, but the trip computer screen was displaying the fuel mileage, but now it's gone. It comes on when you press the button on the wiper stalk. However, previously, it was displayed directly on the screen. How can I reset it?