Your exhaust has four 02 sensors. Code PO154 refers to no activity at bank two, sensor one.,Typically 02 sensors are good for up to 100K miles, after that their performance declines. You can try removing the sensor and shake it closely, next to your ear ( listen for a rattle). If you hear a noise while you are shaking it. The 02 sensor is junk. The side that Cylinder #1 is on is "Bank one" the other side is "Bank Two". Sensor one refers to the upstream senor (the sensor located before the CAT. Sensor Two would refer to the "Down Stream" sensor. Which refers to the 02 sensor located after the CAT. I hope that helps. Please write back if you have more details or questions. Good luck.
SOURCE: 97 ford taurus: Cylinder 2 misfire
Assuming the plugs and wires have been changed. I would look at the bottom of the coil pack. They tend to crack and short out.
Or if it's got coil packs they will also crack and short out.
SOURCE: obd diagnostic code for a 2004 dodge ram 2500
clogged cat converter i think.catalytic converter
SOURCE: computer at auto parts place says misfire on cylinder 5
Try replacing the fuel pump too.
Good.
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SOURCE: 3.5l engine, car shakes
the chances are good for the number 5 coil needing replacement, but before i did anything else i would change that cam sensor, that could be causing your problem all the way around.. hope this helps... setting timing is a big drawn out job, i dont think you will need to do that, timing shouldnt be out.
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