All of the sunroofs with only forward/backward movement were very reliable. If the cable/housing becomes a problem it can be expensive. The number of cable problems with these roofs (in all models)for all our 22 years was surpased in the first 2 years of 124 body lift back roofs.

Keep the tracks clean and slightly lubed and don't force it if it refuses.

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Steve Brotherton
Owner 24 bay BSC
Bosch Master, ASE master L1
26 years MB technician