Fiat 500X Exhaust System: Specs, Fitment & Common Faults
On the 500X, if Multijet diesel, excess fuel from DPF regeneration can genuinely sink into the sump and cause the oil level to actually rise.
Illustration for editorial purposes
Opens live listings in a new tab.
OEM Part Number: confirm via VIN — Rear silencer (aftermarket) Bosal 148-193 / Walker 23838
| Rear silencer (back box) — aftermarket | Bosal 148-193; Bosal 148-183; Bosal 148-253 (accessories needed); Walker 23838 (880 mm, with pipe); Walker 23332 (850 mm); Walker 22693 (820 mm) |
|---|---|
| Centre / intermediate silencer — aftermarket | Bosal 135-465; Walker 01489 (750 mm); MTS 01.80750 (860 mm); Vegaz FTS-325 (760 mm); Imasaf 35.80.06 |
| Front pipe / catalytic converter (DPF on diesels) — aftermarket | or DPF: Bosal 090-810 (Euro 5/6); Walker 28589 (code 91, 500 mm, with manifold); Vegaz ALK-957 (Euro 4/5/6, 470 mm); Imasaf 11.10.33 (Euro 5/6, 410 mm); NAP CAK11471; BM Catalysts BM92030H (Euro 6, with FK92030) |
| Genuine (OE) numbers quoted | None quoted in catalogue listings — order genuine parts against your VIN |
| Fitment notes | Engines 1.0, 1.3, 1.4, 1.6, 2.4 petrol and several diesels listed generally; not mapped to parts. |
A Genuinely Serious, Distinctive Symptom Worth Checking For — Fiat 500X Exhaust System
If your Multijet diesel is going through DPF regeneration cycles, this is genuinely worth knowing and checking for regularly: excess fuel injected during regeneration can work its way past the piston rings and sink into the sump, contaminating the oil and — distinctively — causing the oil level to genuinely rise rather than fall. Worth checking your dipstick periodically for a rising level specifically.
It's also genuinely worth knowing that regular oil changes, at or before the recommended interval, are particularly important on this engine given how directly oil condition relates to this failure mode.
Fiat 500X Exhaust System: The Part That Announces Its Own Problems
On the Fiat 500X, this is one of the few parts where your ears will catch a problem before your eyes do — a new rattle, a drone, noise that simply wasn't there a week ago. That's a genuine advantage, since it gives you an early warning most other faults don't offer.
Fiat 500X Exhaust System: Watch: Replacing It
Small 500 only; loose match, no 500X exhaust repair found
Fiat 500X Exhaust System: What It Does
On the Fiat 500X, burnt gases leave the engine through the exhaust system, which quiets them via the silencer and treats emissions through a catalytic converter and particulate filter before anything exits the tailpipe. Petrol and diesel versions frequently use entirely different systems, since their emissions treatment needs aren't the same.
Opens live listings in a new tab.
Fiat 500X 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 Fiat Exhaust System
The same part, covered across other Fiat models.