Vauxhall Insignia Exhaust System: Specs, Fitment & Common Faults
A genuine money-saving find: Vauxhall reportedly quotes £1,400+ for an EGR cooler fault that a £36-80 repair kit can often fix instead.
Illustration for editorial purposes
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OEM Part Number: confirm via VIN — Rear silencer (aftermarket) Bosal 185-959 / Walker 23824
| Rear silencer (back box) — aftermarket | Bosal 185-959, 185-683, 185-647, 185-459, 190-363, 185-685, 185-475, 185-469; Walker 23824, 70338, 70308, 23138; Asmet 05.206; Vegaz OS-746, OS-451 (right side), OS-337; Izawit 21.075, 21.134, 21.131, 21.047 (no Polmo) |
|---|---|
| Centre / intermediate silencer — aftermarket | Bosal 200-825, 278-135, 200-269; Vegaz IS-110, OS-278, RS-318; Polmo 21.282; Izawit 21.087, 21.070 |
| Front pipe / catalytic converter (DPF on diesels) — aftermarket | Bosal 090-199, 090-184 (Euro 5/6); Walker 28787 (245mm), 28916 (325mm); Vegaz OK-332/OK-332QP (370mm), OK-857 (Euro 5); BM Catalysts BM91720H, BM92140H |
| Genuine (OE) numbers quoted | 5852595 (Izawit 21.087 middle) |
| Fitment notes | no twin-exit/VXR info. |
Confirmed: A Genuine Money-Saving Find on the EGR Cooler Fault — Vauxhall Insignia Exhaust System
On 2.0 diesel Insignia models, a documented and common fault involves the EGR cooler's internal cooling sleeve cracking, leaking coolant directly into the exhaust flow and preventing the DPF from regenerating properly — often showing up as a "DPF full" warning that won't clear even after driving. Some owners report being quoted over £1,400 by Vauxhall for a full EGR unit replacement, but the actual failed component is very often just the sleeve and gaskets, available as a standalone repair kit for as little as £36-80, fixable in around an hour's labour. If you're quoted a full unit replacement for this specific fault, it's genuinely worth asking specifically about the cheaper sleeve/jacket repair kit option first.
Vauxhall Insignia Exhaust System: The Part That Announces Its Own Problems
On the Vauxhall Insignia, 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.
Vauxhall Insignia Exhaust System: Watch: Replacing It
exact Insignia A, custom exhaust fit
Vauxhall Insignia Exhaust System: What It Does
The Vauxhall Insignia'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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Vauxhall Insignia 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 Vauxhall Exhaust System
The same part, covered across other Vauxhall models.