mixing problems

Hello good afternoon, dear friends, I introduce me I am Felipe and I have a Turbo Forest Subaru year 2000, I have had problems lately I ignite the check Engine, and it throws me 2 codes; 23 and 13 that are oxygen sensor and the cam, a few days ago the car was very drowned so I took out the air filter leaving it free, the car worked very well, until yesterday that the same problem returned, it pulls explosions, I do not keep the engine when lighting in cold and boot Automotive first year and I would like to receive opinions that can help me thank you very much

Hello Felipe, what I think is that the camshaft sensor, or is damaged, or has moved this, or the distribution is outdated, if something of this is happening, it is normal that it starts badly and that it does not remain cold, the smoke with the smell of benzina is that it is not burning well ... the ignition signal is outdated because of the sensor. Oxygen can be measuring excess of this because of bad combustion. You can check the camshaming sensor by measuring its continuity and comparing it with the nominal values, to also see the status of its plug or wiring and support and it is not necessary Piston, total, a "tinglado" like the one you comment. Good luck with it !!