Toyota Prius Exhaust System: Specs, Fitment & Common Faults
On the Prius, attempting a motorway "regen" while the engine management light is already on is often genuinely futile.
Illustration for editorial purposes
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OEM Part Number: confirm via VIN — Rear silencer (aftermarket) Bosal 228-185 / Walker 22203
| Rear silencer (back box) — aftermarket | Bosal 228-185, 228-407, 228-063, 228-477, 228-001; Walker 22203; Asmet 20.020/20.029/20.036/20.021; MTS 01.60957, 01.61199, 01.97470; Vegaz TS-493, TS-226; Polmo 26.177, 26.08, 26.02; Izawit 35.013, 35.025 |
|---|---|
| Centre / intermediate silencer — aftermarket | Bosal 228-251; Walker 22017, 22418, 22018, 23695; Vegaz TS-232, TS-278, TS-235; Polmo 26.19/26.22/26.280; Izawit 35.001, 35.043 |
| Front pipe / catalytic converter (DPF on diesels) — aftermarket | Bosal 090-012 (Euro 4); Walker 20763 (470mm); Vegaz TK-324 (Euro 6), OK-342; BM Catalysts BM91873H, BM91339H, BM91263H; JMJ 1091034 (1KR-FE), 1091303, 1091587 |
| Genuine (OE) numbers quoted | None quoted in catalogue listings — order genuine parts against your VIN |
| Fitment notes | Match engine code, fuel and emissions standard. |
A Genuinely Important Point Worth Knowing Before Attempting a Motorway "Regen" — Toyota Prius Exhaust System
If your diesel's engine management light has already illuminated, this is genuinely important to know before spending time and fuel on a hard motorway run: a proper regeneration cycle generally can't occur while the engine management light is on, since it indicates an underlying fault the ECU needs resolved first. Attempting to "drive it out" at this stage is often genuinely futile — the fault causing the light needs diagnosing and fixing before regeneration can succeed.
It's also worth knowing that a recurring EGR-related fault code that returns despite cleaning points toward the valve needing replacement rather than further cleaning.
Toyota Prius Exhaust System: The Part That Announces Its Own Problems
Where a lot of Toyota Prius 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.
Toyota Prius Exhaust System: Watch: Replacing It
Gen2 cat-back replacement
Toyota Prius 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 Toyota Prius's exhaust job in three steps. Petrol and diesel versions frequently need different systems entirely, since their emissions treatment isn't the same.
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Toyota Prius 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 Toyota Exhaust System
The same part, covered across other Toyota models.