Thank you, sir.

One point. I think your vehicle is later than mine and does not have the KE Jetronic injection with separate electronic ignition that my 1991 car has.

Having said that, you suggest that the 'reference resistor' is that which is plugged into the ignition control module and, presumably, retards the ignition. If so, that makes sense to me as I have removed that resistor over the years in order to test the vehicle's performance and fuel consumption when using 98 (as opposed to 95) RON fuel. Never noticed any significant improvement.

So, the system might have logged the removal of the resistor as a fault.

I still cannot understand why I can't erase the faults. I did so for the auto box and it now works very well.

Oh well, As long as the thing drives well I suppose that's the main thing.

Thanks again.

RayH