Additive Counter can be reset manually with an ignition key sequence and fuel filler flap.

Light on, Dealer only are required to reset the system.

Finally there's the reset procedure to do it manually.... and it does work! because I completed it successfully.

Ensure filler flap is closed, and ignition is in position 0

You have 60 seconds to complete stage 1 of the procedure, beginning when ignition is turned to position II

Stage 1

Turn ignition to position II

open fuel flap, close fuel flap

open fuel flap, close fuel flap

Turn ignition to position 0

Turn ignition to position II

Stage 2 must be started within 60 seconds of igition being turned to position II in Stage 1

Stage 2

You have 10 seconds to complete the following

open fuel flap, close fuel flap

open fuel flap, close fuel flap

open fuel flap, close fuel flap

For Stage 3, wait a minimum of 15 seconds.. but no more than 30 seconds, anything over 30 seconds and you have to start again.. the window is 15-30 seconds.

Stage 3

You have 10 seconds to complete the following

open fuel flap, close fuel flap

open fuel flap, close fuel flap

open fuel flap, close fuel flap

Stage 4

Start engine, and run at idle for minimum of 20 seconds

After 25 seconds, MIL or PCL light should illuminate, or message displayed on instrument cluster to indicate reset has been achieved

Turn off engine, and move ignition to position 0

Turn ignition to position II, no message, PCL/MIL light should no longer be illuminated

If either are illuminated or message still displayed, try procedure again