Replace worn O2 sensor wires, or lengthen the extisting wiring for relocation of the oxygen sensor.
 
Part # ProductDescription Media
24050 Oxygen Sensor Bung for air/fuel calibration only(18mm) Oxygen Sensor Bung for air/fuel calibration only(18mm)
Photo
$8.48
24060 Oxygen Sensor Bung (18mm) Oxygen Sensor Bung (18mm)
Photo
$5.35
 
http://hedman.com/images/ePIM/original/24050.jpg
http://hedman.com/images/ePIM/original/24060.jpg