Hello, i have EK4 with B16A2 300k km. I replaced Knock sensor with "Hofer products" one for 30€ (old one broke) and it worked perfectly for 10km then it started poping engine light for O2 sensor and Knock sensor, always simuntainesly and randomly. Sometimes after 20km of hard driving and other times after only 500m away from home. It always go away when i turn car off and on again. The preformance doesn't drop after engine light comes on. I also institaled new ignition coil and new sporty exhaust header. Knock sensor continiously out put voltage of 0,04-0,06V and rearly exceds to 0,08V. Should i buy OEM KS for 200€? Maybe new O2 sensor??? Thanks