TSBs

Audi Wastegate Problem

Jan. 28, 2022

This bulletin applies to 2013-2014 Audi A4, A5, A5 Cabriolet, A6, Q5 and TT vehicles equipped with a 2.0 TFSI engine.

This bulletin applies to 2013-2014 Audi A4, A5, A5 Cabriolet, A6, Q5 and TT vehicles equipped with a 2.0 TFSI engine. The customer may note a reduction of power. Diagnostic trouble code (DTC) P029900 (turbo/supercharger under boost) may be stored in the engine control module (ECM), J623 (address word 01).

The circlip connecting the turbo wastegate actuator rod and the wastegate flap level can fall off due to low clip tension. If this happens, the wastegate linkage becomes disconnected. Clips are now available that provide improved material with higher tension.

Visually check the wastegate linkage to see if it is disconnected (a mirror or borescope may be needed). Remove the catalyst, according to ELSA instructions, to gain access to the wastegate linkage. Reconnect the linkage using a new circlip N 0124394 (referred to as lock washer linkage, vacuum unit 8mm).

About the Author

Information courtesy of Mitchell 1

Information for Technical Service Bulletins comes from ProDemand, Mitchell 1's auto repair information software for domestic and import vehicles. Headquartered in San Diego, Mitchell 1 has provided quality repair information solutions to the automotive industry since 1918.

About the Author

Mike Mavrigian | Motor Age Editor

Mike Mavrigian has written thousands of automotive technical magazine articles involving a variety of specialties, from engine building to wheel alignment, and has authored more than a dozen books that crisscross the automotive spectrum. Mike operates Birchwood Automotive, an Ohio shop that builds custom engines and performs vintage vehicle restorations. The shop also features a professional photo studio to document projects and to create images for articles and books.