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No two door lock mechanisms are quite the same across different vehicles, so getting the specifics right matters when you buy used, second hand or a replacement. Answer a few quick questions below and breakers will only quote if they have the exact matching part in stock:
No – the W163 (1997–2005) and W164 (2005–2011) are completely different generations with different door structures, so their door lock mechanisms are not interchangeable. Always source a mechanism from the correct generation for your vehicle. Confirm the exact fit with the breaker using your registration number.
The W164 received a facelift in 2008 and the W166 received updates during its 2011–2019 run, but door lock mechanisms are generally tied to the generation rather than the facelift year. That said, whether a pre-facelift and post-facelift mechanism from the same generation interchange is something you should confirm with the breaker against your registration, as minor changes can occur mid-production.
Yes, side matters – the nearside (NS, passenger/left) and offside (OS, driver/right) mechanisms are handed and will not swap over. Always tell the breaker which side you need, using NS or OS, to make sure you get the correct part for your ML.
Trim level does not affect door lock mechanism fitment on the ML – the mechanism is determined by the generation and the door side, not whether the car is an SE, Sport, or AMG Line specification. You may find cosmetic differences around the door furniture, but the lock mechanism itself should be the same across trims within the same generation.
No – the W164 (2005–2011) and W166 (2011–2019) are separate generations with different door designs, so their lock mechanisms are not compatible. Make sure you source a mechanism from the correct generation, and confirm the match with the breaker using your full registration.
No – the door lock mechanism is nothing to do with the engine or gearbox fitted to your ML, so whether you have a diesel, petrol, or any transmission variant makes no difference to fitment. What matters is the generation (W163, W164, or W166), the door position, and the side (NS or OS).