A4 Mk1
| Checking secondary air pump relay -J299- and activation |
| Special tools and workshop equipment required |
| t | Hand-held multimeter -V.A.G 1526 A- |
| t | Voltage tester -V.A.G 1527 B- |
| t | Adapter set -V.A.G 1594 A- |
| t | Test box -V.A.G 1598/31- |
| t | Vehicle diagnosis, testing and information system -VAS 5051- |