Audi A6 2.0 TDI Turbo

2.0 TDI on the A6: 16 engine codes across 4 power groups, new or reconditioned depending on the variant

The first criterion that guides your choice here is not the engine capacity — that is the same throughout — but the exact power output of your engine and the engine code stamped on the block. The A6's 2.0 TDI comes in four distinct groups: 121/136/140 hp (codes BLB, BNA, BRE, BRF, BVF, BVG, CAGB), 136 hp only (codes BNA, BRF, CAGB), 163/177 hp (codes CAHA, CAHB, CGLA, CGLB, CGLC, CGLD, CGLE, CMGA, CMGB), and 170 hp (codes CAHA, CGLB). Some codes, such as CAHA or CGLB, appear in two different groups: the declared rated power can vary depending on the market or specification, which means reading the code alone is not sufficient — cross-referencing the power output with the original manufacturer reference is essential.

New or reconditioned: what the listing shows

For the 121/136/140 hp, 136 hp and 163/177 hp groups, only a new turbo is available — sold as a straightforward purchase, with no old unit to return. The 170 hp group (CAHA, CGLB) is the only one that also offers a reconditioned turbo on an exchange basis: this option makes sense when the original reference is difficult to source new, or when the removed turbo is structurally sound but worn (bearings, sealing). In all cases, before any replacement, the root cause of the failure must be identified: oil circuit contamination, a blocked EGR, a saturated DPF, or a foreign body in the air intake are the most common causes of failure on this engine. Fitting a replacement turbo without addressing the root cause will lead to a rapid repeat failure.