Skoda Octavia Exhaust System: Specs, Fitment & Common Faults
A genuine DIY fix — cleaning a gummed-up EGR valve with carb cleaner — resolves many faults before a costly replacement is needed, plus a real driving technique that clears DPF warnings.
Illustration for editorial purposes
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OEM Part Number: confirm via VIN — Rear silencer (aftermarket) Bosal 233-071 / Walker 22070
| Rear silencer (back box) — aftermarket | Walker 22070 / 22079 (960 mm, code 52), 21342 (1070 mm, code 53); Bosal 233-071 / 233-589; MTS 01.69790 (940 mm), 01.67690 (1050 mm); Vegaz SKS-5, SKS-67IMA, VS-327; Polmo 01.124; Izawit 23.091, 18.006; Asmet 04.093 |
|---|---|
| Centre / intermediate silencer — aftermarket | Bosal 105-111, 105-109; Walker 21576 (800 mm), 21575 (790 mm), 21903 (850 mm); Ernst 202046, 202022, 153003; MTS 01.59790 (880 mm), 01.59810, 01.59800 (900 mm); Vegaz VS-293AT, VS-293IMA (880 mm), VS-293, VS-295; Polmo 01.106, 01.104, 30.233; Izawit 23.034, 18.019, 15.009, 15.033 |
| Front pipe / catalytic converter (DPF on diesels) — aftermarket | or DPF: Bosal 090-285 (Euro 5, ECE E24 103R-00/04*0787, with fitting parts); Walker 20630 (620 mm, code letter 92); BM Catalysts BM31200H (Euro 6 SCR), BM90854H, BM90529H, BM91391H, BM91506H (Euro 4 non-approved, each needs matching FK kit); JMJ 1090854FP2 (AZD/ATN/AUS/BCB), 1091248 (BCB/BCA), 1091391 (BSF/BSE/BGU) - old VW codes, dubious |
| Genuine (OE) numbers quoted | None quoted in catalogue listings — order genuine parts against your VIN |
| Fitment notes | Engines 1.0 TSI-2.0 TSI RS, 1.6-2.0 TDI RS, 1.4 TSI G-TEC |
A Genuine DIY Fix Worth Trying Before Paying for a New EGR Valve — Skoda Octavia Exhaust System
If your diesel Octavia is running roughly with a check engine light, and an EGR fault is suspected, it's genuinely worth trying a clean before paying for a replacement valve: removing the EGR valve and cleaning it with carb cleaner and a toothbrush to clear accumulated carbon deposits resolves the issue for a meaningful number of owners, and it's a straightforward job most confident DIYers can tackle with basic tools. This won't fix a genuinely failed valve (stuck open, electrically dead, or physically cracked), but a valve that's simply gummed up with carbon build-up — a common outcome of regular short-journey, stop-start driving — often responds well to this simple clean.
Worth knowing directly: a badly blocked DPF is sometimes caused by an underlying EGR fault preventing the car from completing natural regeneration in the first place — one documented recovery case saw DPF pressure readings over 1000mbar (dramatically above normal) traced back to a failing EGR valve rather than the filter itself being the root problem, dropping to a fraction of that reading once the EGR issue was addressed alongside a clean.
Skoda Octavia Exhaust System: The Part That Announces Its Own Problems
On the Skoda Octavia, 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.
Skoda Octavia Exhaust System: Watch: Replacing It
Back box swap, but the title does not state the generation
Skoda Octavia Exhaust System: What It Does
Three jobs happen inside the Skoda Octavia'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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Skoda Octavia 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 Skoda Exhaust System
The same part, covered across other Skoda models.