P0138 code help.

[jzales]

My 14 explorer sport threw code P0138 "o2 sensor circuit high voltage, bank 1 sensor 2" 

I am running an unleashed 93 octane tune, kn drop in and autolite xp5364 plugs gapped to .030.

Any ideas on what to check?

[BiGMaC]

Try these:

straightforward:

http://engine-codes.com/p0138_ford.html

Includes the theoretical aspects:

https://repairpal.com/OBD-II-Code-P0132-and-P0138

or just a vid with guy walking through the system check for this code on a car....
http://youtu.be/AHfWxNIuruA

[jzales]

Thank you that was very helpful. Sounds like it can really only be one thing a faulty 02 sensor or wiring.  With 30k miles on it I'm surprised it would go so soon but I'll swap itbout and see what happens.

[AJP turbo]

Do u have down pipes?

[jzales]

Do u have down pipes?

No downpipes here yet..

[jzales]

I just jacked the truck up and looked at the 02 sensors.  The one after the rear turbo had some chaffing on a black wire right at the top of the sensor.  Is this bank 1?  Where is the number 1 cylinder on the ecoboost motors in the front or back of the engine?

[SHOdded]

For transverse engines (side to side), firewall side of engine is bank 1, radiator side is bank 2.  For longitudinal engines (as in F150), passenger side is bank 1, driver side is bank 2.

[jzales]

For transverse engines (side to side), firewall side of engine is bank 1, radiator side is bank 2.  For longitudinal engines (as in F150), passenger side is bank 1, driver side is bank 2.

Perfect so I located my issue I believe.. time to go to the dealer to get it replaced.

Thanks

[BiGMaC]

Sounds like you gotit.  Good job!