Original BMW Transmission Oil Cooler Coolant Return Hose for BMW 330e (2016–2018)

The Original BMW coolant return hose carries coolant through the transmission oil cooler and thermostat circuit of the 2016–2018 BMW 330e, which uses the B48X engine. BMW names it the coolant hose, return, and places it in that cooler-to-thermostat section of its parts diagrams. The hose is made in Germany. Age dries out and hardens coolant hoses like this one. Watch for cracking, leaking, swelling, and general deterioration of the hose body.

Original BMW Parts carry a 24-month parts warranty.

The current number, 17-12-8-740-117, comes from June 2017 production. It replaces the earlier 17-12-8-673-124. BMW marks the change as exchangeable retrospectively, which means this hose also fits 330e cars that left the factory with the older number. That lets one part cover the full 2016–2018 range. If your old hose carries the 673-124 number, this is the correct replacement. BMW applies it to the F30 facelift sedan in 330e form only.

Technical Details

• Manufacturer: BMW (Original BMW Parts)
• Part number: 17-12-8-740-117
• BMW part name: coolant hose, return
• Diagram group: transmission oil cooler to thermostat
• Production start: June 2017
• Replaces: 17-12-8-673-124, exchangeable retrospectively
• Sold individually as one hose
• Made in Germany
• Warranty: 24 months

Common Questions

My car has hose 17-12-8-673-124. Will this one fit?
Yes. BMW lists this number as the retrospective replacement for 673-124, so it fits earlier 330e cars too.

What signs point to a failing hose?
Look for cracks, swelling, coolant leaks, or a hose that has turned hard and brittle.

PMB Performance supplies Original BMW cooling parts for the F30 330e.

Fitment & Compatibility

Compare your production year and trim against the table below. PMB Performance can confirm this against your VIN, backed by more than 20 years of parts and fitment work.