Seat Ibiza Exhaust System: Specs, Fitment & Common Faults
A genuine, documented Ibiza case: the Dieselgate emissions update was followed by an EGR failure and a complete breakdown in traffic — real fault codes and a technical explanation for why.
Illustration for editorial purposes
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OEM Part Number: confirm via VIN — Centre silencer (aftermarket) Bosal 233-477 / Walker 24145
| Rear silencer (back box) — aftermarket | Hella 8LD 366 035-451 (two-piece set); No Bosal, Walker, Klarius, Ernst, Asmet, MTS, Vegaz, Polmo, Izawit listed. |
|---|---|
| Centre / intermediate silencer — aftermarket | Bosal 233-477, 233-783 (106.65 GBP), 220-015 (accessories); Walker 24145 (900 mm), 71335 (1000 mm), 24298 (924 mm); Ernst 114172 (900 mm); Vegaz SES-128 (980 mm), SKS-30, VS-535, VS-537 (850 mm); Polmo 24.97, 24.78; MTS 01.50006 (950 mm); Izawit 18.072. |
| Front pipe / catalytic converter (DPF on diesels) — aftermarket | Bosal 090-149 (Euro 4), 090-191 (Euro 5), 090-150 (Euro 4); Walker 28058 (225 mm, with manifold), 28102 (270 mm, with manifold), 28699 (370 mm); Vegaz SEK-951 (Euro 4/5, 320 mm), VK-355 (front, Euro 4, 370 mm); NAP CAK10780 (engine code BME/BZG, Euro 4, 320 mm); JMJ 1091213 (BME/BZG), 1091627 (400 mm); BM Catalysts BM91712H (Euro 5), BM91588H, BM91535H; AS 33784 |
| Genuine (OE) numbers quoted | None quoted in catalogue listings — order genuine parts against your VIN |
| Fitment notes | BME/BZG are the 1.2 12v 3-cyl petrol (64/70 PS) codes. |
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 Ibiza Exhaust System: The Part That Announces Its Own Problems
On the Seat Ibiza, sound is usually the first clue here, ahead of any visual sign — a rattle, a drone, noise that's crept in gradually or arrived overnight. It's one of the more forgiving faults in that sense, since your ears will likely flag it before it becomes a bigger problem.
Seat Ibiza Exhaust System: Watch: Replacing It
Aftermarket back box fitted to a 6J
Seat Ibiza Exhaust System: What It Does
The Seat Ibiza's exhaust system handles three things at once: clearing burnt gases from the engine, cutting noise via the silencer, and treating emissions through a catalytic converter and particulate filter. Because petrol and diesel emissions requirements differ, it often uses genuinely different exhaust systems depending on engine type.
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Seat Ibiza 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.