Used Mercedes-Benz GLE Catalytic Converter

This is important to check carefully because the GLE spans two distinct generations: the first-generation W166 ran from 2015 to 2019, and the second-generation V167 arrived for 2019 onwards, so a 2016 and a 2019 car could be from entirely different platforms with different exhaust systems. Even within the W166, Euro 5 and Euro 6 emissions rules mean the catalytic converter design can differ between earlier and later cars. Always confirm with the breaker against your exact registration and engine code before buying.

Yes, engine code is one of the most important factors for catalytic converter fitment on the GLE, because Mercedes fitted several different petrol and diesel engines across the range — for example the 2.1-litre diesel, 3.0-litre diesel, and various petrol V6 and V8 units — each with their own exhaust and emissions hardware. A catalytic converter matched to the wrong engine code is unlikely to fit correctly and may cause MOT or emissions failures. Always give the breaker your registration number and engine code so they can cross-reference the correct part.

Trim level alone — for example AMG Line versus standard Sport trim — does not determine catalytic converter fitment; what matters is the engine code and emissions standard the car was built to. The exception is the AMG 63 variants, which use a completely different high-output V8 engine and will require a catalytic converter specific to that engine rather than one from a standard diesel or V6 petrol GLE. Confirm the exact engine code and variant with the breaker to make sure the part matches your car.

Diesel GLEs have both a diesel particulate filter (DPF) and a catalytic converter as separate but related parts of the exhaust aftertreatment system, so you do need to be clear with the breaker about which component you actually need. The catalytic converter on a diesel handles NOx or oxidation duties, while the DPF captures soot particles, and they are not interchangeable with each other. Because the precise configuration can vary between engine codes and Euro 5 versus Euro 6 build years, confirm exactly which part you need against your registration with the breaker.

The W166 GLE received a facelift in 2018 which brought some updates, but whether the catalytic converter is interchangeable between pre- and post-facelift W166 cars depends on the engine code and whether the emissions specification changed at the same time. Because catalytic converter and DPF interchange specifics are particularly difficult to confirm without checking part numbers, this is firmly a question to put to the breaker with your registration to hand. Do not assume a visual match means the part will fit or pass MOT.

No — petrol and diesel GLE catalytic converters are entirely different parts designed for their respective combustion processes and emissions systems, and they are not interchangeable at all. Petrol units typically use a three-way catalyst, while diesel systems use an oxidation catalyst working alongside a DPF, and the mounting, sizing, and chemistry will differ. Always make clear to the breaker whether your GLE is petrol or diesel, and provide your engine code and registration for an accurate match.