New engine runs great BUT -------HELP!

[Cvan]

My newely installed 4.2 engine runs great, starts great, and sounds better. But I have 2 trouble codes that I have never heard of before. They are -PO155- which is "sensor heater circuit malfunction, bank #2 sensor #1 and -PO161- "sensor heater circuit malfunction, bank #2 sensor #2. What are these sensors and where are they located????? Please, any help would be greatly appreciated.
Thank you!!
Chris

[Cvan]

Resolved!! This conserns the preheater on the O-2 sensors in the exhaust. Evidently There are heat coils in the oxygen sensors. If they burn out or are not supplied with voltage the above trouble codes will show up. I hope this will help someone in the future.
Chris

[BrianA]

Yep, you're right.
The O2 sensors have heaters built in.

Glad you found the prob and really glad to hear your motor runs good.

Sincere congrats on your project!

[Cvan]

Thanks for your kind words. I'm crowding 60 pretty hard and I'm glad the project is over. I have to admit that I probably felt just as good as I did 40 years ago when the first project started up and ran like I hoped it would. This may be the last one tho. I just don't bend and move like I used to. And why Ford felt the need to stick the engine half way under the dashboard is beyond me. Other than that it was a pretty straight forward project. This is a fine group of people and I would like to thank everyone for their support.
Have a good new year,
Chris

[BrianA]

Originally Posted by Cvan

Thanks for your kind words.

This is a fine group of people and I would like to thank everyone for their support.

Chris

Chris, thank YOU.
It folks like you that help make FTE work, and a great place to hang out.