420d

Removes DPF regeneration cycles from ECU logic. Off-road use only.

Disables EGR valve operation in software. Cleaner intake, lower carbon buildup.

Disables SCR/AdBlue system in ECU. Off-road only.

Removes specific Diagnostic Trouble Codes from ECU flash. Per-code request.

Disables lambda/O2 sensor monitoring. Petrol tuning helper.

Ignition retard on decel for backfire pops. Sport/track use.

Removes factory top-speed limiter.

Permanently disables auto start-stop system.

Deliver factory-original ECU file (backup / restore purpose).

Optimize shift points, torque limits and lockup for DSG/DCT/8HP/ZF.

Removes catalytic converter monitoring in ECU. Off-road only.