YEHERIT Engine Coolant Expansion Tank for BMW X5/X6 17138621092 with Sensor & Cap — Direct Fit, PA Plastic

YEHERIT 17138621092 is a direct-fit replacement coolant expansion tank with integrated sensor and cap engineered to restore proper coolant circulation and reservoir monitoring on compatible BMW X5/X6 models.

This replacement coolant reservoir (also called an expansion or antifreeze tank) from YEHERIT is molded from high-temperature PA plastic and supplied with the pressure cap and level/temperature sensor required for direct installation. It replaces several OEM numbers and suits a range of BMW E70, F15, F85, E71, F16 and related chassis where the factory tanks have aged, cracked, or developed leaks. The component manages overflow and return flow of coolant as engine temperature fluctuates, helping the cooling system maintain correct fluid levels and pressure.

Which BMW models and years will this reservoir fit?

The reservoir fits a selection of X5 and X6 chassis across multiple model years and engine sizes. Verify fitment using your vehicle’s year, make, and model before ordering to ensure compatibility.

• Compatible with BMW X5 (2007–2019) across 2.0L, 3.0L, 4.4L, and 4.8L engines (E70, F85, F15 family).
• Compatible with BMW X6 (2010–2019) for 3.0L and 4.4L engines (E72, F86, E71, F16 family).
• Cross-references OEM numbers like 17137552546, 17138621092, 17137647290 and others for accurate matching.

How does this expansion tank function in the cooling system?

The tank serves as a reservoir for coolant that expands when the engine heats up and returns it to the radiator as the system cools. It also houses the level/temperature sensor that communicates fluid status to your vehicle’s monitoring system.

• Collects excess coolant under pressure to prevent overflows and maintain system balance.
• Allows coolant to flow back into the radiator as temperature drops, preserving correct levels.
• Integrates a sensor to feed coolant level/temperature information to the dashboard indicators.

What are the build quality and materials, and why do they matter?

Constructed from durable PA (polyamide) plastic, the YEHERIT tank is designed to resist high heat cycling, vibration, and the chemicals found in coolant formulas. Solid materials reduce the chance of cracks and leaks that commonly develop in aging factory tanks.

• High-temperature resistant PA construction for longer service life under thermal stress.
• Factory-style sensor and cap included to match original functionality and fitment.
• Designed to withstand vibration and chemical exposure typical in automotive environments.

What warranty and support come with the part?

YEHERIT provides a one-year unlimited-mileage guarantee and responsive customer support, which can be helpful if you encounter fitment questions or early failures.

• One-year unlimited-mileage warranty against defects in workmanship and materials.
• Customer support promise: responses within 48 hours for inquiries and installation help.
• Return or replacement options available if the part does not match the vehicle or is defective.

Who is this for: Drivers and independent mechanics who need a reliable, OEM-referenced replacement coolant expansion tank for BMW X5 or X6 models built between 2007 and 2019. It’s suited for owners replacing a cracked, leaking, or sensor-faulty reservoir who want a direct-fit part that includes the cap and sensor, backed by a one-year guarantee. Always confirm fitment using your vehicle’s year/make/model and the provided OEM cross-reference numbers before purchase.