Second Hand Mercedes-Benz GLS Fuel Injector

Fuel injectors exist on all GLS variants because every engine in the GLS range — whether petrol or diesel — uses fuel injection; there is no carburetted or injector-free option on this model. Diesel GLS models (such as the GLS 350d) use high-pressure common-rail diesel injectors, while petrol models (such as the GLS 400, GLS 450, and GLS 580) use direct petrol injectors, and these two types are completely different parts that do not interchange. Always confirm which fuel type your vehicle runs before sourcing a replacement.

The X166 GLS ran from 2016 to 2019 and the X167 generation replaced it from 2019 onwards, bringing revised engine families with different injector specifications, so these two generations are very unlikely to share injectors even where an engine size looks similar on paper. The engine code is your most reliable guide — check yours against the V5 or a VIN check and supply it to the breaker so they can match against the donor vehicle's code rather than guessing by year alone. Never assume a part crosses a generation boundary without the breaker confirming it against your registration.

Trim and badge names on the GLS reflect different engine variants, so in this case the badge does matter — not because of trim, but because different badges indicate genuinely different engines with different injector types and specifications. A GLS 350d and a GLS 400d are both diesel but run different engine codes and fuelling setups, so their injectors are not interchangeable; similarly, a GLS 450 petrol and a GLS 580 petrol use different engines entirely. Always identify your exact engine code from the V5 rather than relying on the badge alone, and give that code to the breaker.

Both years fall within the X166 generation (2016–2019), so the engine code is likely to be the same, which is the most important factor for injector fitment. If the engine codes match on both donor and recipient vehicles, fitment is generally consistent within the same generation, but confirm this with the breaker against your specific registration as ancillary or injector specification changes can occur mid-production without a model-year change. Supply your full engine code rather than just the year to give the breaker the best chance of sourcing the correct part.

This is an important question — on modern Mercedes-Benz engines, individual injectors often have calibration codes that need to be programmed into the ECU so the engine management system can compensate for each injector's specific flow characteristics. Whether a used injector from a breaker will require coding, and whether it can be coded to your vehicle, is something you must confirm with your fitting garage and with the breaker before purchasing, as this varies by engine type and model year. A reputable breaker should be able to advise whether the injector they're supplying is likely to need coding for your specific engine.

No — petrol direct injectors and diesel common-rail injectors are completely different in design, operating pressure, and fuel compatibility, so they cannot be interchanged under any circumstances. Diesel injectors operate at extremely high pressures (often exceeding 2,000 bar in common-rail systems) and are engineered to very precise tolerances specific to diesel combustion, whereas petrol injectors work at far lower pressures and with different spray patterns. Always match the injector to your fuel type and engine code, and confirm the specific part with the breaker against your registration.