Originally Posted by stereo

the code 41 will only come on if theres a problem with the heater in the O2 sensor or if theres no power getting to the sensor with the O2 the exhaust doesn't need to be there jsut the O2 plugged in...to test unplugged O2 with a multi meter check then pins to of where the 2 black wires are (heater ) with the key in the on position 1 should have 12v on it the other goes back to the ecu if no power check fro blown fuses as the heater runs on a different fuse also how old is your cat?