Hey up Tony

There is two main issues here to Dave's post.

The PCM and ICU have reached diagnostic decision that the Knock limits have exceed the upper limits. On this example cylinder 4.

Once this DTC has been triggered the only way to erase this fault is to successful reprogram the correction factor for the injector in question.

So until this is done it will log the fault with both KOEO and KOER.

As you already know cylinder 4 does not mean injector 4 , in fact cylinder 4 would be injector 2.

Now its seem that the Autocom have changed there programming procedure to take away the confusion.

If Dave had IDS or AD Pro to hand I'm pretty so if he entered the code for injector 2 the light would stop flashing and the DTC would clear.

Then after running the engine if there was a fault with injector 2 or cylinder 4 were it caused the knock limits to exceed to upper limits then it would log the code again.May be after a 100 mile road trip.

Its not as most people think that it as lost the coding. Its has it states in the DTC the knock limits are at fault. Now due to type of system the TDCI is the most likely cause would be a injector problem. Ford have written the software that you must re-enter the injector data as your first diagnostic step.

after this you then carry out the many other fuel system test's that can be done to try and find why the knock limits are so high.

I hope that makes more sense and I'm not insulting your vast experience and intelligence.

Thanks

Darren.........