Lexus RX Exhaust System: Specs, Fitment & Common Faults
Confirmed: Lexus UK officially confirms second-generation RX400h models were a particular theft target — plus an honest, alarming account of an owner paying £775 for a CATLOC and insurance excess, only for thieves to steal the cat again anyway.
Illustration for editorial purposes
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OEM Part Number: confirm via VIN — Rear silencer (aftermarket) Bosal 148-193 / Walker 22693
| Rear silencer (back box) — aftermarket | Walker 22693 (820 mm); Walker 23164 (720 mm); Walker 21993; Walker 17166; Bosal 148-193 (accessories needed); Vegaz PGS-129, OS-337; MTS 01.69030, 01.95530, 01.95820 |
|---|---|
| Centre / intermediate silencer — aftermarket | Bosal 105-109, 233-577 (accessories needed); Ernst 177092, 153003; Walker 21575, 28832, 09738; Vegaz TS-320, VS-244AT; MTS 01.59790, 01.50577, 01.51350 |
| Front pipe / catalytic converter (DPF on diesels) — aftermarket | Vegaz TK-320, TK-336 (Euro 6), AK-833; Oyodo 10N0193-OYO; NAP CAK10404 (1G-FE); Ridex 429C0042; Walker 69002/69003 universal |
| Genuine (OE) numbers quoted | None quoted in catalogue listings — order genuine parts against your VIN |
| Fitment notes | engines 200t, 300, 350 petrol, 450h hybrid (incl. AWD); not engine-specific. |
Lexus RX Exhaust System: The Part That Announces Its Own Problems
On the Lexus RX, you'll typically hear this fault developing long before you'd ever see it — a new rattle, an odd drone, noise levels creeping up from one week to the next. That early audible warning is a genuine head start on catching the problem before it worsens.
Lexus RX Exhaust System: What It Does
The Lexus RX's exhaust does more than just carry gases away from the engine — it also handles noise reduction through the silencer and emissions treatment via a catalytic converter and particulate filter. That's why petrol and diesel versions can use entirely different systems.
Lexus RX Exhaust System: Watch: Replacing It
2015+ generation, rear silencer straight-piped
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Confirmed: A Genuine Official Warning Worth Knowing About Theft — Lexus RX Exhaust System
This is genuinely worth knowing directly from Lexus themselves: Lexus UK has officially confirmed that second-generation RX400h models, built between 2005 and 2008, have been a particular target for catalytic converter theft, given the ground clearance that makes it easy for someone to get underneath. It's genuinely worth taking preventative measures seriously if you own a car from this specific generation and era.
It's also genuinely worth knowing an important point relevant to any insurance claim: the way thieves typically cut a catalytic converter free, often using an angle grinder or a wire saw, frequently damages the surrounding rear pipe and downpipe as well, meaning a genuine insurance claim will often need to cover replacement of most of the exhaust system, not just the missing converter itself — worth being aware of this wider scope when discussing repair costs with your insurer.
Lexus RX 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 Lexus Exhaust System
The same part, covered across other Lexus models.