Seat Ateca Exhaust System: Specs, Fitment & Common Faults
If your Ateca is a diesel that had the Dieselgate emissions update, a documented pattern links it to EGR failures afterward — including real fault codes worth knowing.
Illustration for editorial purposes
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OEM Part Number: confirm via VIN — Rear silencer (aftermarket) Bosal 154-511 / Walker 21953
| Rear silencer (back box) — aftermarket | Bosal 154-511, 233-607 (accessories); Walker 21953 (640 mm, code 52), 21950 (530 mm), 22059 (810 mm, code 62); Ernst 112215 (780 mm), 105026 (690 mm); Asmet 03.097, 03.086, 07.174; MTS 01.69080 (1000 mm), 01.95530 (740 mm), 01.69030 (820 mm); Vegaz VS-290, VS-352AT, FTS-5; Polmo 08.399, 08.400, 08.671, 23.68, 23.70 |
|---|---|
| Centre / intermediate silencer — aftermarket | Bosal 220-015, 105-111, 233-633, 105-109, 233-477; Walker 71341 (1000 mm), 21575 (790 mm); Ernst 153003 (810 mm); MTS 01.59790, 01.80390, 01.59810; Vegaz SES-187, VS-293AT, SKS-30AT, VS-111; Polmo 24.78; Izawit 16.009, 15.033, 18.030, 18.022, 15.009 |
| Front pipe / catalytic converter (DPF on diesels) — aftermarket | BM Catalysts BM31200H (SCR cordierite Euro 6, E57-103R) plus Euro 4 non-approved ones; JMJ 1091391 (BSF/BSE/BGU), 1090854, 1091248, 1090138 etc. (old VW engine codes); Ridex 429C0042, 429C0073, 429C0076; EEC VK6048T. NAP CAK10788 is for a 1988-1993 car (ignore). |
| Genuine (OE) numbers quoted | None quoted in catalogue listings — order genuine parts against your VIN |
| Fitment notes | Engines: 1.0 TSI 110 to 2.0 TDI 190. The silencer lists are the same as the Arona/Leon 5F set. Cat list is mostly old/non-matching VW parts; do not trust for KH7. |
Worth Knowing: A Documented Link Between the Emissions Fix and EGR Failure
Worth understanding if you own a diesel SEAT that received the emissions compliance software update following the 2015 "Dieselgate" scandal: a genuinely documented, real case describes a 2011 Ibiza that ran fine for a period after the update, then developed a rough idle in first gear, an intermittent engine management light, and finally broke down completely in the middle of traffic — diagnosed by breakdown recovery as an EGR valve fault. Specific fault codes reported in connection with this pattern include P0407 and P046C, both relating to EGR sensors. The suggested technical explanation is that the software update commands the EGR valve to positions it was never previously asked to reach, accelerating wear and failure in valves that were coping fine under the original software calibration.
Separately, and relevant regardless of whether the emissions update applies to your specific car: a blocked DPF is overwhelmingly a short-journey problem — the filter needs sustained running at higher revs for around 20 miles to regenerate properly, and a diesel used mainly for short, low-speed trips may never complete this cycle, leading to warning lights, limp mode, and eventually a blockage requiring active intervention.
Seat Ateca Exhaust System: The Part That Announces Its Own Problems
On the Seat Ateca, most faults are things you'd spot visually first, but this one usually announces itself acoustically — a rattle, a drone, a noticeable jump in noise levels. That's actually helpful, since it means you'll likely notice trouble well before it gets serious.
Seat Ateca Exhaust System: Watch: Replacing It
Cat-back replacement on the Ateca, though an aftermarket Cupra fitment rather than a stock-part swap
Seat Ateca Exhaust System: What It Does
Three jobs happen inside the Seat Ateca's exhaust system: routing burnt gases away from the engine, quieting them through the silencer, and treating emissions via a catalytic converter and particulate filter. Petrol and diesel variants often need completely different systems to meet their respective emissions requirements.
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Seat Ateca 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 Seat Exhaust System
The same part, covered across other Seat models.