Originally Posted by Ill_Born_ss

Same thing for this fouler thing and /or the emulator they are used for when the cat is flowing to fast and the O2 sensor cannot sample the exhaust path as it is to fast. Then the O2 sensor is moved to get out of the fast track and given the chance to sample more correctly. This is why some factory installs have bends associated with one of the O2 sensors. Then customers/owners do mods to remove the restrictions and end up doing more mods to fool/ trick the system another way. The emulator is usually used for the same reasons just a different way of doing it.


It is not the front O2 sensor that calls for the code it is the rear that says wait a minute there is little or no change from front to rear and then tells the comp to add fuel. As I explained earlier the comp can only do so much then a lean/ rich condition occurs. In your case I believe it to be bordering on lean. But the simple testing will tell if done correctly.