Big Jim
Hard-core CEG'er
You should know that you posted this on the V6 forum. The 96 and newer V6 does indeed have four sensors.
Your 96 and newer 4 cylinder only has two sensors. One exhaust manifold. One bank. One upstream sensor. One downstream sensor.
Your 96 and newer 4 cylinder only has two sensors. One exhaust manifold. One bank. One upstream sensor. One downstream sensor.