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hello guys, I have a golf 7 gti, I'm having a low voltage o2 sensor, I was getting a o2 low voltage of sensor 1(wideband), i replaced the o2 with a original used one but I'm still getting a low voltage code, I checked the freeze frame and each time I get this code I noticed that it happened before even the engine starts, freeze frame showing all 0 values, one time it showed that it happened 4 seconds after start up, and never got the code while driving always on startup, I checked the voltage reading on idle and on engine off everything looks normal, checked everything when the engine is running and everything is running perfectly, I checked the o2 wiring and plug everything looks good, and I can't ignore the code because the car will start operating in open loop, what do you guys think is causing this code, and the car had a Stage 3 custom tune for more than two years and never had this problem. appreciate your help.
