Second Hand BMW i3 Catalytic Converter

No — the BMW i3 is a fully electric vehicle (BEV) and has no internal combustion engine, so it has no exhaust system, no catalytic converter, and no DPF. These components simply do not exist on any variant of the i3, including the standard battery-only version and the range-extender (Rex) model. If you believe you need an exhaust-related part for your i3 Rex, the small two-cylinder range-extender engine does have a very compact exhaust outlet, but this is a bespoke unit — contact a BMW i3 specialist or breaker directly with your registration to identify the correct component.

The i3 Rex has a small 650cc two-cylinder petrol range-extender engine, and while it does have a basic exhaust system, whether a serviceable catalytic converter exists as a separate replaceable part on this unit is not something we can confirm with certainty. You should contact a breaker directly with your full registration number so they can check against the exact Rex exhaust assembly they have available. Do not assume a catalytic converter from any other BMW model will interchange with the Rex system — it is entirely unique.

The BMW i3 was sold in various specification levels in the UK — including base, Range Extender, and later Edition and Sport-trimmed variants — but trim level has no bearing on the exhaust system, since only the Rex models have any exhaust at all, and all Rex units share the same range-extender engine. If you have a Rex, the relevant factor is the Rex drivetrain itself, not the trim name. Confirm the exact part needed with your breaker against your registration.

Since no standard BMW i3 has a catalytic converter at all, this question does not apply to the vast majority of i3s on UK roads. If you have a Rex model and are looking for exhaust components, the i3 Rex was sold from 2014 onwards and the range-extender unit did not change significantly across the model's life, but confirming whether parts from different model years interchange is firmly confirm-with-the-breaker territory given how specialised this system is.

It is quite possible — customers sometimes search for a catalytic converter when the fault or warning relates to a different system entirely. On a battery-electric i3, emissions-related warning lights or unusual smells are more likely linked to the battery thermal management system, HVAC, or in the case of a Rex, a fault within its compact exhaust assembly. We would recommend checking your exact fault code with a BMW-compatible diagnostics tool and then contacting a specialist breaker with your registration to identify the correct used part.