Used BMW 8 Series Fuel Injector

Yes, all BMW 8 Series variants — both the original E31 generation (1989–1999) and the current G14/G15/G16 generation (2018–present) — are petrol or diesel engines that use fuel injectors as a core part of the fuelling system. Every engine variant across both generations, whether petrol or diesel, relies on injectors to deliver fuel, so this is a genuine part for this model. The specific type of injector (port injection, direct injection, or twin-injection depending on the engine) varies by engine code, so identifying your exact engine code from your V5 or a VIN check is essential before sourcing a replacement.

Both the 2019 and 2022 840i sit within the current G15/G14/G16 generation (2018–present) and share the same B58 straight-six petrol engine code, which is the primary fitment factor for injectors. In principle, injectors from the same engine code within the same generation are strong candidates for compatibility, but minor ancillary or specification changes can occur mid-production, so confirm the part against your exact registration with the breaker before purchasing. Never assume fitment without that check.

Trim level itself does not determine injector fitment — what matters is the engine code. The 840i uses the B58 straight-six and the M850i xDrive uses the S58 or N63 V8 depending on year, so these two models take different injectors purely because they have different engines, not because of any trim-related difference. If you were comparing two cars with identical engine codes, the trim level would be irrelevant to injector compatibility. Always lead with your engine code when asking a breaker for a quote.

No, diesel and petrol injectors are completely different components and are not interchangeable under any circumstances. The 840d uses a straight-six diesel engine (engine code B57) with high-pressure common-rail diesel injectors, while the 840i uses a petrol engine (B58) with direct petrol injectors — different technology, different fittings, different operating pressures. Always specify both your engine code and fuel type when asking a breaker for a fuel injector.

No — the E31 and G15 are entirely different generations separated by nearly two decades, with completely different engine families, fuelling systems, and injector specifications. The E31 used engines such as the M60 and M73 V8s and V12s with the injection technology of that era, while the G15 uses modern turbocharged units like the B58 and S58, so parts are not compatible across this boundary. Source injectors only from a vehicle sharing your exact engine code, and confirm with the breaker against your registration.

Body style makes no difference to injector fitment — injectors are engine components and are identical across coupe (G15), convertible (G14), and Gran Coupe (G16) variants that share the same engine code. A breaker pulling an injector from a G14 convertible 840i is supplying the same part as one from a G15 coupe 840i, provided the engine code matches. Focus entirely on the engine code and fuel type when assessing compatibility.