Contour Enthusiasts Group Archives Forums Modifications 3.0L Duratec 02 Sensor Question

Hey this isn't for a Contour but for the 3.0L Duratec.

My father's Tauros has P0155 Code (Upstream Bank No. 2 Sensor Fault)

I would imagine this means the Sensor has failed, but there is a 100 dollar deductible on the warrenty. So here's my question, Is the Bank No. 2 on the 3L Duratec the front or back exhaust manifold? Because I know it will be cheaper then 100 dollars for us to do it ourselves and easy to do if you can reach the 02 sensor. But if its like the back Bank on the 2.5 duratec It might be worth just letting the Dealer do it.

TIA!

Bank 2 is the front bank. It is from cylinders 4, 5, and 6.

There are other things that can cause that code, such as a vacuum leak, so it would be a good idea to try to check it out first.