u/Asdfgh269

So I recently bought my first car, got it with a new engine changed by the dealership and it has around 40,000km on the engine. I had a P2562 engine code, turbo positioning sensor, did some research and got it fixed and now I have a P0299 engine code. My car also get about 300-360km on a full tank of gas, it's a 70litre tank. Any advice?