My '54' plate, 2.0 ltr, 150 bhp, GT-TDI Golf, which has driven 57k miles, is using approximately 1 litre of coollant per 3-4 weeks. The car is driven 35 miles daily, through medium to light traffic. It nver overheats and runs really well, no signs of discoluring in the oil, and no obvious signs within the clean engine bay. Is this a common ?
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I had a similar problem - engine would run at only low rpm. I suspected fuel starvation from a clogged fuel filter, but it turned out to be a carbon-fouled intake manifold. Depending on how yours was driven (lugging?) and the total mileage (high), I would check the manifold for carbon builup. Cleaning the manifold is difficult or very expensive, as it should be removed and baked out. There are probably several other possible causes that I, fortunately, have not experienced.
When there's something wrong with the brake pressure that handbrake warning light comes on.
The ESP warning light could be caused by a lot of things, but most likely it's a dirty fuel filter. Don't take my word for it though, just go to the VW dealer and have it read the faultcodes from the ECU, which should point you/them in the right direction.
Alternatively, when you have the right equipment (= VAGCOM + cable) and knowledge, you or a friend yould diagnose the ECU yourself.
From the sounds of it, you'll need a small service (air filter and oil filter change, etc.) anyways. Don't forget to reset the ECU (or dis- and reconnect the battery) afterwards to erase the faultcode from memory (when there's still something wrong, it'll return soon enough).