Reconditioned Audi A6 Engine

Audi A6 Engines from 2004 to 2018: fourteen years of blocks, three engine families, ten codes

The A6 C6 (2004–2011) and the A6 C7 (2011–2018) share no engine blocks, even where the engine capacity is identical. This is the first thing to establish before any identification: the vehicle's registration year and generation define the scope of compatible codes, well before capacity or power output. This catalogue covers three engine families — 2.0 TDI, 2.0 TFSI and 3.0 TDI — with ten distinct engine codes spread across them.

The 2.0 TDI: six codes across two generations

This is the best-represented engine family in this guide, with six codes: BRD, BRE, CAGB, CAHA, CGLB and CMGA. The BRD and BRE codes belong to the C6 phase, whilst CAGB, CAHA, CGLB and CMGA correspond to later developments. These blocks are not interchangeable between phases: the engine identification plate, stamped directly on the block, remains the only reliable starting point for identification. The A6's 2.0 TDI is an engine that typically accumulates high mileage, often under sustained motorway use; the most common signs of wear affect the oil pump assembly and the crankshaft bearings.

2.0 TFSI and 3.0 TDI: petrol and six-cylinder diesel

The 2.0 TFSI is listed with three codes — CAEB, CDNB and CDNC — all of which correspond to the C7 generation. This direct-injection petrol engine is known for oil consumption issues linked to the piston rings on certain production runs; the engine code allows the exact production series affected to be pinpointed. The 3.0 TDI is represented by a single code, CRTE, a V6 diesel engine used in both saloon and estate variants. All blocks in this catalogue are sold as bare engines, on an exchange basis or as a rebuild of the customer's own unit, subject to available references.