I have a 2018 ltz Z71with the 6.2 engine. Recently the fuel gauge won't read correctly. Also anything above half a tank of fuel kicks the engine light on and it gives me P015B. Which means the O2 sensor on the driver side need to be changed..but as soon as I get below half a tank of fuel. The engine light turns off, but the fuel gauge still doesn't read correctly. Does anyone have any thoughts besides changing the O2 sensor and changing out the fuel pump that has sensor on it for the fuel gauge.