2008 Jetta 000802 - Engine Speed Sensor (G28) Fault

[Crasher]

I have only seen it on engines with electrically operated EGR valves and the G28 is direct to ECU on the BXE. A new/used ECU is not plug and play, it has to be coded to the car (easy with VCDS) but matched to the immobilser in the instruments which isn't easy without ODIS or specialist aftermarket gear.

[Skezza]

I have only seen it on engines with electrically operated EGR valves and the G28 is direct to ECU on the BXE. A new/used ECU is not plug and play, it has to be coded to the car (easy with VCDS) but matched to the immobilser in the instruments which isn't easy without ODIS or specialist aftermarket gear.

Luckily, this is an area that I have some experience in. I don't usually pair the immo, opting to either clone / swap the EEPROM from the existing ECU or simply doing an IMMO OFF on the donor instead. Certainly on EDC15 and ME7.5 I've previously been able to extract the SKC as well which allows a proper pairing job. I know it all sounds very janky, but would help me avoid the whole ODIS / Abrites route. If I take it the specialists and it's the ECU, it's going to come back via the Abrites / ODIS route regardless and I know from experience that turns into £££.

Is there any risk if I plug a non-paired ECU and then plug the original ECU back in? I'm sure I've heard some VAG cars it can send the Instruments into a sad brick-like place (I'm thinking Audi with an RB8 cluster) and can leave the car in a non-start state.

[Crasher]

If you clone it there should be no issue, I had to last week with an A4 TDI as my ODIS laptop's wifi failed so I just cloned a used ECU instead of using ODIS.