Mercedes-Benz GLA Catalytic Converter Replacement Parts

The GLA runs across two generations — the X156 (2013–2020) and the X247 (2020 onwards) — and the 2015 and 2018 examples are both X156, so you're broadly in the same generation; however, the X156 spanned the Euro 5 to Euro 6 emissions transition around 2015–2016, which affects catalytic converter specification even within the same generation. A unit from the wrong emissions era may not fit correctly or could cause an MOT failure, so you should confirm with the breaker that the donor car's engine code and emissions standard match your registration exactly before buying.

Yes — all petrol-engined GLA models have a catalytic converter as standard, and diesel variants have one integrated into or alongside the exhaust aftertreatment system (usually combined with a diesel particulate filter). The GLA has always been available with both petrol and diesel engines in the UK, so catalytic converters exist across the range. Which type and configuration you need depends on your specific engine code and emissions standard, so check your V5C or confirm with a breaker against your registration.

No — petrol and diesel catalytic converters are fundamentally different components and are not interchangeable. Petrol engines use a three-way catalyst, while diesel systems use a diesel oxidation catalyst typically paired with a diesel particulate filter (DPF). Always make sure any used cat you're sourcing matches your fuel type and engine code exactly.

Trim level — whether SE, Sport, AMG Line, or similar — does not affect which catalytic converter you need; fitment is determined by the engine code, fuel type, and emissions standard, not by interior or exterior specification. An AMG Line badge does not mean a performance engine unless the car is a full AMG variant (such as the GLA 45 AMG), so always check the actual engine code on your V5C rather than going by trim name alone. The GLA 45 AMG uses a different high-output engine and its exhaust system should be confirmed separately with the breaker.

The second-generation GLA (X247) launched in the UK in 2020, replacing the first-generation X156 (2013–2020), so a 2020 car could potentially be either generation depending on its exact registration date. The two generations use different platforms and different engine families, so the catalytic converter is not the same between them. Confirm your generation and engine code with the breaker against your registration before ordering, as fitting a part from the wrong generation is a common and avoidable mistake.

This is strong confirm-with-breaker territory — a visually similar catalytic converter from a Euro 5 car may not meet the stricter Euro 6 emissions requirements of a later GLA, and fitting the wrong unit could lead to an MOT failure on emissions grounds. The Euro 6 transition for the GLA fell broadly around 2015–2016 within the X156 generation, meaning there are cars that look identical on the outside but have different exhaust system specifications underneath. Always give the breaker both your registration and the donor vehicle's registration so they can cross-reference engine codes and emissions compliance before the sale.