Hyundai i40 Catalytic Converter Replacement Parts

Yes, all petrol-engined Hyundai i40s have a catalytic converter as standard, as this is how petrol engines control harmful exhaust emissions. The diesel i40 (1.7 CRDi) uses a different emissions system centred on a diesel particulate filter (DPF) and a diesel oxidation catalyst (DOC) rather than a traditional three-way catalytic converter. So whether your i40 has a conventional cat depends entirely on whether it is the petrol or diesel variant — check your V5C or registration plate details to confirm your fuel type.

The Hyundai i40 was produced from 2011 onwards as a single generation, but there is a facelift boundary around 2015 that can affect exhaust components, and Euro 5 and Euro 6 emissions rules also changed across this period. A cat from the pre-facelift era may not be a straight swap onto a post-facelift or later-registered car, and fitting a unit from the wrong emissions era could cause an MOT failure. You should confirm the exact part compatibility against your registration with the breaker before purchasing.

No, trim level does not affect catalytic converter fitment on the i40 — Classic, Active, Style, and Premium are all specification packages covering interior and equipment differences, not engine or exhaust architecture. What actually matters is your engine code and fuel type, since these determine the exhaust system fitted. A cat from a matching engine-code petrol i40 of the same emissions era is the correct starting point, regardless of trim.

The i40 was offered in both saloon and estate (tourer) body styles in the UK, and while the engines were shared across both, the exhaust routing and component dimensions can differ between body styles. It is therefore not safe to assume that a cat from an estate will directly fit a saloon or vice versa. Always confirm the body style as well as the engine code and year with the breaker when sourcing a used cat.

Engine code is one of the most important matching factors for a catalytic converter, as units are engineered to match specific engine outputs and emissions calibrations. For the petrol i40, the 1.6 GDi engine is the variant to which a conventional cat applies, and you should check your V5C or an online registration lookup to confirm the exact code fitted to your car. Because catalytic converter interchange specifics are complex, always quote your engine code and registration to the breaker and ask them to confirm fitment directly rather than relying on year alone.

No — diesel and petrol exhaust aftertreatment systems are fundamentally different and are not interchangeable. The diesel 1.7 CRDi i40 uses a diesel oxidation catalyst and DPF arrangement suited to diesel exhaust chemistry, while the petrol 1.6 GDi uses a three-way catalytic converter that requires the correct air-fuel mixture to function. Fitting the wrong type would not work correctly, would likely trigger warning lights, and could result in an MOT failure, so always source a cat that matches your specific fuel type and engine.