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Should I worry about the coolant warning light in a Passat?

Hi, I'm currently looking to move to a diesel as my new job has me doing a far longer commute. I've spotted a second hand '03 VW Passat 1.9 TDI that I like the look of. I did a full history check on the vehicle and it seems genuine. Only issue is that the coolant warning light is flashing when the coolant level is fine. A friend suggested it could be the sensor needs to be replaced, but I don't want to buy if it's something more serious. Is this a common problem with VWs?

Thanks. Sean.

Lower rev limit on diesel Focus?

I recently purchased a 2006 diesel Ford Focus and have noticed on a couple of occasions that the engine cuts out when I exceed a certain engine speed. This happened to me this morning as I was overtaking. As you can imagine, it was quite an unnerving experience. I understand that changing gear a bit earlier avoids the problem but I was wondering if this was normal behaviour or what might be causing it. It's happened three times and each time I'd estimate about 3,000rpm in second gear. On each occasion the engine cut out. Most recently was yesterday morning pulling out of the Maxwell Motors slip road in Blackrock heading south. I let the car glide to a halt and I restarted the engine.