Hello All, After info please? I have a VL turbo Calais auto, original 300,000 KM that had a rough running problem that I sorted out, but now the diagnostic screw at the ECU won't cancel the codes, it appears to of been forced previously & when turning anti clockwise wont go back to the fuel mixture lights or RPM setting, The red & green lamps stay flashing the knock sensor code 34, does any one know if the screw pot in the ECU can be replaced? Also does anyone know if the timing stays 5� retarded when code 34 is displayed or only momentary when knock is produced? Thanks - Leigh

Have answered this one myself, detonation code 34 must of been active, cleaned ECU terminals & cleared code & now mixture lights work OK. Cheers - Leigh