Just change this. Bank 2 (radiator side) upstream O2 sensor. You need a 22 mm or 7/8 inch or O2 sensor socket.
Bank 2 Upper O2 sensor;
On this 2-D picture, ignore the red box and arrow, the Bank 2 Upper is the sensor on the left of the pre-cat. The arrow is pointing to the Bank 2 pre-cat
Originally posted by chongo:
