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182 missfire

Car  Clio 182 Cup
My new to me 182 cup has developed a serious missfire under load. It starts at about 2500 rpm and clears, if i can get through it at about 4000 rpm.
Fault code 266 :O2 sensor signal before Cat.
I noticed that there is a brown wire that comes through the bulkhead near the exhaust that is burnt through and was sitting on the exhaust. I cant see the other end of it. Does anyone know what that wire is ?
Any thoughts
 
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