Hi, first post here and hoping someone might be able to help me as ive had a look around the net and cant find much info.

I installed one of these kits yesterday, was brand new from a sealed box, followed all the instructions and read through a "how to guide" on another forum and installed it just how it said. Was working fine for id say about an hour total of driving and then the gauge starts playing up and the readings were going all over the place, one minute its rich at 8, the next its lean at 22, then it just stuck at the bottom of the gauge on 8. So i turn it off and restart it and it just gets stuck on hrt and wont go any further. I tried re-calibrating it and it sits on hrt for ages like 5 mins then changes to cal and sits on that for around 5 mins and then throws up error code E8. Ive checked the code and it says dodgy sensor.

Ive pulled the sensor out the exhaust and tried it in free air and it dont make any difference, the sensor does get quite hot tho, but not all the time, bear in mid ive tried re-calibrating it a dozen times and sometimes its a bit hit or miss, sometimes it wont make it to calibrating and just gets stuck on heating it up. Ive rechecked all wiring, tried different points for the earth including on the engine.

Any help would be much appreciated.