What is the determining factor in how may O2 sensors the contour has???
I believe the 2.0L has three and the 2.5L has four. Mine showed a CEL several weeks ago that was diagnosed to be a defective Bank 1, Sensor 2 problem. Before buying a replacement I crawled under there and found that the wiring that ran to the sensor was almost touching the exhaust pipe. Nothing was melted or damaged but it was close. I rerouted that with a ziptie and after about 15 minutes of driving the CEL went out and has never come back.
