# Service bulletin A421214 2026049\-

A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.

- Type: Service bulletin
- NHTSA id: 10122790
- Published by NHTSA: 2017\-11\-08
- Manufacturer's number: A421214 2026049\-
- Manufacturer's date: 2012\-10\-05
- NHTSA component: POWER TRAIN; POWER TRAIN:AXLE ASSEMBLY:AXLE SHAFT

## NHTSA's summary

Supersedes Technical Service Bulletin Group 42 number 12 ? 13 dated September 5, 2012. Oil leak 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 vehicle with a sports differential. Optimized use of sealer in production from 07/10/2011.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2012/MC-10122790-9999.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2012/MC-10122790-0001.pdf)

The document is the manufacturer's. This site does not hold it.

## Components

Transmission and driveline, Axle

## Vehicles listed

- 2010 to 2012 AUDI S4
- 2010 to 2012 AUDI S5
- 2010 to 2012 AUDI S5 CABRIOLET

## Other bulletins for the same vehicles and component

- [A421524 2026049\-](/bulletins/10120812.md), 2017-10-27, Service bulletin: POWER TRAIN:AXLE ASSEMBLY:AXLE SHAFT. 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.
- [TSB\-42\-12\-11](/bulletins/10045439.md), 2012-09-06, Service bulletin: POWER TRAIN:DRIVELINE:DIFFERENTIAL UNIT; POWER TRAIN:AXLE ASSEMBLY:AXLE SHAFT. AUDI: CONSTANT VELOCITY OF JOINT GREASE AT REAR DIFFERENTIAL, CAUSES AN OIL LEAKAGE IN AREA OF QUATTRO SPORTS REAR DIFFERENTIAL SIDE FLANGE, OR AXLE SHAFT INBOARD FLANGE, DUE TO INSUFFICIENT SEALANT ON PROTECTIVE CAP. \*PE
- [TSB\-42\-11\-09](/bulletins/10042394.md), 2011-12-07, Service bulletin: SUSPENSION:REAR:AXLE:NON\-POWERED AXLE ASSEMBLY; POWER TRAIN:AXLE ASSEMBLY:AXLE SHAFT. AUDI: VEHICLES WITH QUATTRO SPORTS REAR DIFFERENTIAL LEAKS AT THE REAR AXLE SHAFT SIDE FLANGE OR INBOARD FLANGE. MODELS S4, S5. \*PE
- [TSB\-42\-11\-08](/bulletins/10042393.md), 2011-12-07, Service bulletin: POWER TRAIN:DRIVELINE:DRIVESHAFT; POWER TRAIN:DRIVELINE:DIFFERENTIAL UNIT; POWER TRAIN:AXLE ASSEMBLY:AXLE SHAFT. AUDI: CERTAIN VEHICLES WITH AXLE SHAFT INBOARD FLANGE OR SPORT DIFFERENTIAL SIDE FLANGE WILL EXPERIENCE AN OIL LEAK IN THOSE AREA. MODELS S4, S5, S5 CABRIOLET. \*PE

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