Toyota Avensis Exhaust System: Specs, Fitment & Common Faults
A genuinely important point worth knowing: attempting a motorway "regen" while the engine management light is already on is often futile — the light itself can prevent regeneration completing.
Illustration for editorial purposes
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OEM Part Number: confirm via VIN — Rear silencer (aftermarket) Bosal 228-477 / Walker 22203
| Rear silencer (back box) — aftermarket | Estate: Walker 22203 (940 mm, code 52); Bosal 228-477, 228-185, 228-407, 228-063; MTS 01.60957, 01.61199, 01.96420, 01.60714, 01.97470; Vegaz TS-226, TS-493; Polmo 26.08, 26.16, 26.23, 26.177, 26.275, 26.178; Asmet 20.020, 20.021, 20.029, 20.036; Izawit 35.013, 35.019 |
|---|---|
| Centre / intermediate silencer — aftermarket | estate: Walker 22017, 22018, 22418, 23695; Bosal 228-251; Izawit 35.001, 35.043; Polmo 26.19, 26.22, 26.280; Vegaz TS-232, TS-235, TS-242, TS-258, TS-278, CS-429 |
| Front pipe / catalytic converter (DPF on diesels) — aftermarket | or DPF: Walker 20763 (470 mm, code 91), 28331 (420 mm, manifold); Vegaz TK-339 (Euro 6), TK-933 (Euro 3, 470 mm), TK-933ERNS; BM Catalysts BM91303H (Euro 4), BM91339H; JMJ 1091585, 1091598, 1091682 (1AZ-FE), 1091303 (1AZ-FSE); no Bosal |
| Genuine (OE) numbers quoted | None quoted in catalogue listings — order genuine parts against your VIN |
| Fitment notes | no per-part mapping. |
A Genuinely Important Point Worth Knowing Before Attempting a Motorway "Regen" — Toyota Avensis Exhaust System
If the engine management light (not just a dedicated DPF light) has already illuminated, this is genuinely important to know before spending time and fuel trying to clear a blocked DPF with a hard motorway run: a proper regeneration cycle generally can't occur while the engine management light is on, since the light 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 a regeneration can complete successfully. It's also worth knowing that DPF sensitivity on these diesel engines has been described by specialists as somewhat less sensitive than on some other manufacturers' systems, meaning by the time symptoms become obvious, the underlying blockage may already be more advanced than the warning lights alone would suggest.
It's also worth knowing that a recurring EGR-related fault code that returns despite cleaning, particularly one that clears temporarily after a battery disconnect only to return within a few miles, points toward the valve itself needing replacement rather than further cleaning — worth having the valve's full range of movement tested with proper diagnostic equipment rather than repeating a clean that isn't genuinely resolving the underlying wear.
Toyota Avensis Exhaust System: The Part That Announces Its Own Problems
Where a lot of Toyota Avensis 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 Avensis Exhaust System: Watch: Replacing It
Avensis rear silencer removal; generation not verified (T270 likely)
Toyota Avensis 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 Avensis'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 Avensis 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.