Audi A5 Cabriolet 2010–2012 — technical service bulletin
Bulletin A421524 2026049- · NHTSA communication 10120812 · issued Jun 30, 2015
Technical service bulletin
communication type
Power Train
component
2010–2012
model years
9
vehicle entries
Official summary
Supersedes Technical Service Bulletin Group 42 number 13-17 dated March 18, 2013. Oil is leaking in the area of the Quattro sports rear differential (PR-PDU, PDR, or GH2) side flange or axle shaft inboard flange. Insufficient sealant on the protective cap on the inboard constant velocity joint at the rear differential on vehicles with a sports differential.
Vehicles covered
What a TSB means. Technical service bulletins are repair guidance manufacturers send to dealers — they are not recalls, and repairs are not automatically free (warranty extensions are an exception worth checking). The full document is available via NHTSA’s vehicle lookup.