Error Code 41 - O2 Sensor

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I have a dc2r that is running incredibly rich at the moment - about 250km's to a full tank driving 'normally'.

My mechanic hooked up his diagnostic computer to see where the problem was, (i.e. if it were a failed o2 sensor, or other problems making the o2 sensor trip out). Essentially the o2 sensor seems to be giving readings throughout the rev range. I previously that day thought I saw a Code 5 (MAP Sensor) come up, but may have mistaken for Code 41 (i.e. still five engine light flashes).

The light came on after a 'showoff session' with a friend recently, the engine was operating above 6500rpm for the majority of the time and bouncing off rev limiter between gears.

The engine is also idling at about 1100rpm most of the time and sometimes drops to 900rpm.

I am running a full mugen exhaust and trust intake - Is it possible the Mugen headers have cooked the o2 sensor? Has anyone else experienced this?

From what I have read it is likely my primary o2 sensor that has failed - could the readings the mechanic saw on the computer be coming from the secondary sensor?

I have tried to provide as much info as possible -- Your help is appreciated.

:Confused

 

Have you had the valves adjusted? I think someone just recently had the same problem and the adjustment along with a few other things cured it. I believe he replaced the distributor cap and rotor and ignition coil.