Fault phenomenon:
When the gear of the W164 W166 third row seat adjustment motor cannot adjust the seat up and down, it is usually due to the original plastic teeth breaking, which makes it unable to be used normally. Replacing with new metal teeth can solve the problem and greatly save costs

2013 - 2019 MERCEDES GLS450 X166 REAR LEFT THIRD 3RD ROW SEAT ADJUST MOTOR gears OEM
07-19 Mercedes X164 GL450 GL350 GL320 3rd Third Row Seat Motor gears 1648201942 OEM
Seat Adjust Motor Repair gears for Mercedes Benz X164 X166 GL320 GL450 
A1648202342   A1649390014  A1648201942