What country are you in? Here in the U.S, anything '96 and newer has "on-board diagnostics, version 2" which sounds like what you have too. That means there will be oxygen sensors after each catalytic converter to monitor their efficiency. The stored diagnostic fault codes will be a lot more descriptive too. When the Check Engine light is flashing, that means shut the engine down right away to prevent overheating the catalytic converters from too much raw unburned fuel entering them.
The place to start is having all of the diagnostic codes read, record them, erase them, then see which ones come back as current codes. They will lead you to the circuit or system that needs to be diagnosed.
Unplugging sensors won't make the engine run better. They're simply reporting on what's happening.
Wednesday, October 12th, 2011 AT 9:38 PM