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P26de fault code

Jcst31990
Jcst31990
in Ford Focus Club

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I'm getting alot of issues with my 2014 Ford focus st 3 

Getting faulty codes p26de which is an unknown fault, p0480 radiator fan 1 malfunction and p0137 o2 sensor heater circuit (bank 1, sensor 2)

Really could do with some help here I actually work for a big car garage with access to a Bosch kts 350 which I can use all the time.

Had alot of people suggest certain things I've even respliced the main engine wire harness as I read a thread that suggested that but still have the same issue. I've tested the lambda sensor which was okay.

I'm getting quite a rough idle and the car wont go past 6000rpm it like hits the rev limiter there. Also the turbo will cut out randomly for like a minute or so and also didnt want to start the other day. Also on a separate note the thermometer gauge is just going up and then swiftly going down again. Please can someone help because I dont really wana have to go to Ford and pay an arm and a leg for a diag.

Also should have probably mentioned before that I have a resonantor delete and an exhaust cut out valve just before the back box and a turbo smart dump valve.

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