Audi A6 Exhaust System: Specs, Fitment & Common Faults
On the A6, power loss and smoke that looks like DPF failure on related models can genuinely be a faulty back pressure sensor.
Illustration for editorial purposes
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OEM Part Number: confirm via VIN — Rear silencer (aftermarket) Bosal 105-137 / Walker 71344
| Rear silencer (back box) — aftermarket | Bosal 105-137, 105-127 (need accessories); Walker 71344 (1070 mm, 8.3 kg, code 53, filled); Vegaz AS-44 (940 mm), AS-190 (1070 mm), AS-190IMA (1090 mm, 9.7 kg), AS-193 (1070 mm, 9.59 kg), AS-188 (7 kg), AS-176; Polmo 01.124 (with cat) / 01.14 (without) / 01.05 (manual) |
|---|---|
| Centre / intermediate silencer — aftermarket | Bosal 105-109, 220-015, 105-159; Walker 24145 (900 mm, code 62), 21903 (850 mm, code 52), 22719 (760 mm, code 62); Ernst 202022 (830 mm), 153003 (810 mm), 114172 (900 mm), 202046 (830 mm); Asmet 21.009; MTS 01.59810 (900 mm), 01.59790 (880 mm), 01.53750 (1140 mm); Vegaz VS-293AT; Polmo 01.62/01.251/01.104 (with cat), 01.08 (without) |
| Front pipe / catalytic converter (DPF on diesels) — aftermarket | or DPF: Bosal 099-602 (Euro 4, ECE, with fitting parts); Walker 20928 (410 mm, code 91), 20825 (400 mm, code 91, no pipe); Ernst 760720 (460 mm, Euro 4/5, kit); BM Catalysts BM92109H, BM92108H (Euro 5), BM31130H (SCR, Euro 6), BM90954H (Euro 4, non-approved); Vegaz AK-933 (450 mm, Euro 1/2 only); JMJ 1080021 (445 mm), 1090954 (415 mm), 1091531 (460 mm; BPJ/BYK/BGB/BUL/BWE/BWT/BPG), 1080004 (AVF/AJM/ATJ auto, old). |
| Genuine (OE) numbers quoted | None quoted in catalogue listings — order genuine parts against your VIN |
| Fitment notes | several JMJ/NAP cat entries are older generations, so check fitment. |
Audi A6 Exhaust System: The Part That Announces Its Own Problems
Where a lot of Audi A6 parts fail silently until you spot something visually wrong, this one tends to make noise first — a rattle, a drone, an audible change that wasn't there recently. That's a useful early-warning system if you're paying attention.
Audi A6 Exhaust System: What It Does
Away from the engine, through the silencer, and often through a catalytic converter and particulate filter before reaching the tailpipe — that's the Audi A6's exhaust job in three steps. Petrol and diesel versions frequently need different systems entirely, since their emissions treatment isn't the same.
Audi A6 Exhaust System: Watch: Replacing It
C7 rear silencer work; delete rather than replacement.
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A Genuinely Useful Piece of Context Worth Knowing About DPF Diagnosis — Audi A6 Exhaust System
If you're facing power loss and heavy smoke, this is genuinely worth knowing before assuming the DPF itself has failed: documented cases on related Audi models describe these exact symptoms traced to a faulty exhaust back pressure sensor giving incorrect readings, rather than the DPF itself, worth checking this cheaper component first.
It's also genuinely worth knowing an important legal clarification: removing emissions control equipment fitted for type approval isn't legal in the UK, regardless of whether a "DPF delete" currently passes an MOT test.
Audi A6 Exhaust System: Warning Signs, DIY Difficulty & Aftermarket Advice
These are the same regardless of make or model — see our full Exhaust System Guide for warning signs and fault codes to watch for, confirming fitment against your VIN, and which aftermarket brands are worth trusting.
More Audi Exhaust System
The same part, covered across other Audi models.