Hello experts, i have an shifting issue with my al4 gearbox. There was a problem with gear shifting and in pp2000 it red as permenant fault pressure regulation. i got both pressure reg and lock up valves renewed and the falt got cleared. Right now there is only one issue, gear shift from 1 to 2 with a jerk. All other gears shift without any problem. after driving for about 500km i hooked up pp2000 and it doesnot show any fault. reacently i changed the gearbox ecu and oil level is ok. Additionally i have a fault in downstream o2 sensor. please help with your experties to solve this.