This piston transfers the force of the combustion process to the crankshaft via the connecting rod. The piston is sealed in the cylinder head by the piston rings and pulls air into the cylinder as well as pushing it out through the exhaust. These piston assemblies include a new set of piston rings with the wrist pins and circlips to attach to the connecting rod.

*These piston assemblies are an updated, post oil consumption TSB (technical service bulletin) part#. If you have a 2009-2010 model B8 A4, please call with VIN. This updated piston assembly has larger 23mm wrist pin. Must be used with updated connecting rod (06H198401D) Piston/ring assemblies may be on order block, resulting in a dealership only purchase*