An idiot writes:

While looking for various sensors in the engine of my Volvo 850 GLT tdi
I have disconnected the wrong sensor and now the display has logged a
fault with the Lamda air quality sensor.

This is not faulty, just by starting the car with the sensor out has
logged it as a fault.

So, the question is:

Is disconnecting the battery likely to reset the diagnostics module and
clear the fault light when reconnected?

... or is this a whole dead-horse-flogging session of the highest order
and I will need to either invest in £80 for  service charge or a small
square of black tape to cover the light ... hmmm tough one that.

Will I do any harm by disconecting the battery, I have a note of the
radio code...

TIA,

P.