Amelie

I had very noisy brakes looked at three times and received similar "assurances". Then I took it to a new Citroen dealer who also sells Porsche for its scheduled service. They found that the rear pads were badly worn and needed immediate replacement!?! Very strange that rear pads would fail before the front, since they do much less work. And only 6 months after they were checked 3 times? The new dealer had tested 4 or 5 types until they had found a brake pad that had great performance and much lower dust than the standard. When I remember the brand, I'll tell you. :D

If it is petrol, there could be a bunch of reasons, so I'm told. In general, the computer is having a hard time creating good combustion conditions and therefore the exhaust gases are far from optimal. That's why it could be anything. One possible solution that's quick to try is a tank of 98 octane or higher. It erased that warning after 3/4 of a tank for me. 95RON might not be enough, despite what the sticker says. The other general point is that the warnings tend to be early and well before anything bad happens. Which is nice, but it can be unsettling. You are probably getting a warning well before a similar car would bother to tell you something's wrong. Note: When the "Fuel Level Low" warning appears, you DON'T have a few weeks to do somthing about it. :D If your car is diesel (and the particulate filter probably means that it is) I have no idea. But the general point about the causes stands.

I was using 95 RON in a C5 2.0 Estate, because that's what the fuel cap label said. Then I received a "anti-pollution fault" warning. Nice service man said it could be anything, but suggested a tank of 98 to see if that worked. 3/4 of a tank of 98 later, the warning ceased and has never returned. My guess is that there is no need to tune for fuels within 95-100RON since the computer would adjust timing based on fuel and other conditions. If you had to buy oil-flavoured cordial because you had transferred to some god-forsaken remote outpost, then you would need "adjustment" if that were even possible with such a modern engine. If 98 is unavailable or is vastly more expensive than 95, then perhaps a tank of 98 in every 2, 3 or 4 would be enough. And topping up with 95 shouldn't be a problem.

An athermic windscreen contains metal to reflect heat. Radio signals have a hard time getting through a metal film. If you do have a signal and drive through a marginal area, such as near high-rise buildings or a dense wood, you'll drop signal very easily. I recently had my Garmin c320 mounted high next to the rear-view mirror to get a signal. The black-spotted area either side of the mirror is plain glass that will pass the signal. Because it was impossible to get the internal antenna close to the glass, I now use an external antenna mounted flush against the same spot, with the GPS mounted just above the central electronic scoreboard. I now get signal on warm start and maintain it under fairly difficult conditions. I considered using the magnetic mount outside, but the cable routing wasn't ideal.