Hello, my Volvi has for some time had the error P0171, $12, which means that he is running too thin? (causes* other topic, the garage yard smells a bit of petrol when it is cold …). In September, TÜV and I deleted the error with an OBDII reader. The error then comes after about 20 – 100 km new. If I drive to the TÜV now and the error is deleted first, and the exhaust gas values would be OK, does it exist then, or is the error still “visible” although it is deleted? – Can I make an AU separate from the TÜV (at Volvo), perhaps with a little bit of something for the coffee box? Did I realize that the TÜV technology breaks the inspection process, if there is a “extinguished” error (war) and then there is no plaque… *The throttle flap I had repaired in 2012 (contactless reverber), perhaps due to false values of this “repaired” throttle flap? V70 II, 190.000, Bj, 2,4.