Hello Volvofans, I bought a Volvo s60 2.4t Bj 2001 with manual transmission and 150tkm. About 1.5 months ago I installed a Prins vsi car gas system, the Flashlube system was used for valve protection. Now my problem: right after the installation the car ran perfectly, after approx. one week and 500km on gas the car started at constant speed (approx. 80kmh, Thempomat, 5th gear) to jerking, then feels as if one once gives full throttle and then switches into the emergency run (not faster than 80kmh and only on 4 cylinders), besides, a yellow warning light goes on: engine system, maintenance urgently. The next day on the way to the workshop the error goes off by itself, in the BC is no fault any more, when reading out it also shows no errors. In the gasoline operation it seems normal. Yesterday I had the problem again, only the addition the exhaust control lamp with the attack, error: po422 something with the cat. Has it been possible for you to know what your plant is completely working.