Part number and key specifications - Part Number: 17137567462 - Includes: coolant reservoir tank with cap and sensor - Number of pins: 2 What this part does - Replaces the coolant radiator reservoir tank to maintain proper engine temperature under varied driving conditions. - Restores correct coolant level monitoring (sensor included) and a sealed fill point (cap included), helping prevent engine overheating and related stalling. Compatible vehicles - BMW 128i (2008–2013) — 3.0L L6 Gas - BMW 135i (2008–2011) — 3.0L L6 Gas - BMW 328i (2007–2013) — 3.0L L6 Gas - BMW 328i xDrive (2009–2013) — 3.0L L6 Gas - BMW 335i (2007–2013) — 3.0L L6 Gas - BMW 335i xDrive (2009–2013) — 3.0L L6 Gas - BMW 335is (2011–2013) — 3.0L L6 Gas - BMW M3 (2008–2013) — 4.0L V8 Gas - BMW X1 (2014–2015) — 2.0L L4 Gas and 3.0L L6 Gas Why you need this reservoir tank - Prevents coolant loss and maintains proper cooling system pressure. - Replaces cracked, leaking, or sensor-faulting reservoirs that cause overheating or engine stall. - Includes the cap and sensor so you restore full functionality in one replacement. Important attributes - Function: Coolant expansion and storage; coolant level sensing (sensor included). - Compatibility: Matches the listed BMW models and engine types above. - Connectivity: Sensor connector with 2 pins for the vehicle wiring harness. - Included components: Reservoir tank, filler cap, and level/temperature sensor. Installation overview (basic steps) - Allow the vehicle to cool completely and disconnect the battery if recommended by your service manual. - Remove mounting bolts and carefully detach the existing reservoir. - Drain any remaining coolant into a suitable container for disposal or reuse. - Install the replacement reservoir, reconnect the hose(s) and sensor connector (2-pin), and secure with clamps and bolts. - Reinstall the cap, refill the cooling system to the correct level, bleed air from the system per BMW procedure, and verify there are no leaks and the sensor functions correctly. Practical use scenarios - Routine repair: Replace a brittle or leaking reservoir discovered during scheduled maintenance to prevent future overheating. - Post-accident repair: Restore a damaged reservoir and sensor after a front-end impact or radiator replacement. - Performance/track preparation: Replace an old reservoir and faulty sensor before extended high-load driving to ensure reliable coolant management. Notes and recommendations - Confirm compatibility with your vehicle VIN or consult a technician if unsure. - Proper bleeding of air from the cooling system and correct coolant type are essential for reliable operation. - Dispose of or recycle drained coolant according to local regulations. This replacement reservoir (PN 17137567462) includes the cap and 2-pin sensor and fits the BMW models and engine types listed above to restore coolant storage and level sensing functionality.