I know this is been asked a lot of times, but I have a pacesetter 4-1 header. Every since putting it on I've got code 0133, pretty sure thats the one for slow response. I searched and came up with shaving the bung, adding a washer to the o2 sensor, and the slice job is the problem. I've bought two new sensor and it won't go away. What should I do. Any help is appreciated.