Hi all.
Me again (sorry)
My car is now fully road legal as of yesterday which is great.

However when I got back and plugged my laptop in to the ms3 the o2 sensor is just reading 16.7

The ms3 and sensor is just over 3 months old and purchased due to my old innovate being troublesome.

Status led showing everything is fine. Free air tests show 16.7 and the sensor gets warm.

Any ideas if I can clean the sensor with petrol? Or if anyone else has had similar issues?

The only thing I have not checked is the voltage as the cables run under the scuttle

Thanks

Id start googling, lots of stories of cheaper widebands failing quickly.

I believe Diesel BMWs use widebands which you can get cheaply second hand and they're reliable.

(or i could have imagined this)

You can do a voltage check and calibration in Tuner Studio.
Instructions here: https://www.14point7.com/blogs/news/16539352-maximizing-accuracy-between-spartan-2-and-megasquirt

Morning all and thank you

I have just had an email back an hour ago that they are going to send a replacement.

I will update the thread later on with the results but thank you all for taking the time to reply