My Audi A4 tdi 130 (2002) has just had its glow plugs renewed. Since this visit to the garage, the ESP warning light has come on about 8 minutes into any journey. What's going on?

 

The A4 has been built in four generations.The first generation A4 succeeded.The automaker's internal numbering treats the A4 as a continuation of the Audi 80 lineage, with the initial A4 designated as the B5-series, followed by the B6, B7, and the current B8.