Hi my name is Anthony and I've just joined the club and have a problem with my e11 corolla. It's a 2001 corolla originally 4zz just changed to 1zz. It's reading incomplete catalyst and 02 sensor but there is no code showing I have replaced both the sensor and the cat as it did have a code for 02 sensor. Is there anything else that could cause this? The car is also producing black smoke and using lots of fuel.