[Smileybug]

If its throwing a code, there is a reason. And if its not fixed, the light will continue to come back on. Its not the ECU, I can tell you that right now.

Its going to be a leak in your piping somewhere:

17832/P1424/005156 - Secondary Air Injection System; Bank 1: Leak Detected
Possible Symptoms

* Malfunction Indicator Light (MIL) active

Possible Causes

* Piping between Secondary Air Injection Pump and Secondary Air Injection Valve leaking

Possible Solutions

* Check Piping between Secondary Air Injection Pump and Secondary Air Injection Valve



Are the mechanics who are working on the car VW mechanics? If not, I'd find a reputable VW shop who is more familiar with the car and will be better able to help solve your problem.