Hello to the round! I have been the owner of a Volvo V70 II petrol engine for 3 months (170 hp, year 1/2005). In the last two months I have had to spend quite a lot of time in the workshop (free, Volvo specialized workshop in Hanover) … The reason is the yellow engine control lamp. After the lamp has been lit up for the first time (which is also connected always a noticeable power decrease of the engine), I am directly to the above-mentioned workshop and have the fault memory read out. Diagnosis: camshaft adjustment valve I make it short, since then it has been renewed: – Nockshaft adjustment valve – two oil sludge flushes with oil change (in situ and the 200km variant) – camshaft adjustment wheel (inlet camshaft) – timing disc – air pressure sensor height adjustment – tension roller tooth belts – ignition plugs As soon as a part has been renewed, is short time later the lamp again (in some cases even immediately after leaving the workshop) – by now I am really cloudy and don’t really know. Now the workshop tells me that they can’t really do anything else to do something about it.