2003 Ford Escape Check Engine Code P0136

O2 Sensor was replaced. Actually replaced both downstream sensors (four total, two per bank). Assume they are working as able to pull measured voltages off them. Not sure which fuse under the hood is F1.5. What size is it and what function would it be labeled under? Looked and none labeled as "F1.5". Pulled and checked all of the smaller fuses and all okay. Other ideas?

Here is the link to the owner's manual.

https://www.2carpros.com/articles/mitchell1eautorepair-car-repair-manuals

Page 150 is where fuse information starts. Please let me know where to check. Thanks!

Installed Bosch on downstream sensors only. Bought at Pep Boys. Part # 15719. See: http://c2c.activant.com/ctoc/index.jsp?ID=aEz1rACw.Pnx6LFN9CU8KeWBCUBp3AlMIXj0A

Are you suggesting changing upstream as well with the same kind?

Fuse is good. You are correct that the first choice would be 15718. They did not have the first time, so went with 15719 which is same only longer wires, so it can be used on either left or right or one of the upstream. When we changed Bank 2 downstream sensor, I actually did get the 15718. But that one did not even need to be changed. We just did it because that was the side that had the misfiring cylinder (#5). But no sensor fault code on that side. Anyway, I believe the 15719 should be fine and we are still getting P0136 which is Bank 1 Sensor 2. Checked for leak, and nothing. Mechanic wants to change Cat, which we don't want to do if it is good and voltage readings indicate it is working. I may give to Ford and let them try and figure it out. By the way, I am a volunteer EMT, so I appreciate your service and help.

Originally we did have the misfire code for cylinder #5, but when we replace coil and injector, it fixed the problem and cleared and car ran better. So no more issues there and that is actually on Bank 2 of this car.

As for the downstream sensors, help me out. I thought all they did was monitor. That is, they don't change rich/lean fuel output and therefore don't affect performance. And I was told cat only cleans emissions, so it too will not affect performance. Downstream O2 Sensor's (monitor) job is to measure downstream output and compare to upstream sensor to confirm cat is doing its job. In our case, we show it is working. Was I told all this correctly? If so, then perhaps we have no real problem except maybe the computer. I will try switching sensors to see if that clears.

I hear you about the politics. It is even worse on volunteers who do it for all the right reasons and still are treated poorly. Same everywhere I am afraid and we are losing more and more members due to it. Probably will end up going with paid (professional) in our town before you know it. Oh well.

Finally took it to Ford Dealer. They spent two hours diagnosing and tech thinks he found problem. O2 Sensors seemed fine, but he found an open circuit between the harness where the sensors plug in and the PCM. I thought that made sense, but then why would the sensor still work and give out voltage readings? Dealer labor isn't cheap, but if this is the problem, may be worth it. Thoughts?

Well Ford Dealer replaced the wiring harness that the O2 Sensor plugs into and I have the part. Checked continuity and it was open on the orange wire. Doing drive cycle now to see if the fault comes back or not. If not, off to inspection. Hopefully this is it. By the way, Ford charged me $30 for what looks like a $10 connector and $320 for labor. Ouch!