Bilstein B3 40-221618 Right Rear Air Spring/Bag/Bellow for BMW X5 E53 2000-2006 – RH OSR Offside Driver Side Air Suspension/Air Ride Bladder, Level Control Pneumatic Spring OE Replacement

Bilstein 40-221618 B3 Right Rear Pneumatic Bellow for BMW X5 E53 2000–2006

Bring your first‑generation X5 back to its best with this genuine Bilstein B3 pneumatic spring element for the right rear corner. Part number 40-221618 is engineered for the E53 platform and restores the correct ride height, quiet operation and composed BMW feel. If your X5 sits low on the driver’s side at the back, sags overnight, or the compressor is working overtime, this premium air ride bladder is the dependable fix.

Why owners choose Bilstein for the E53

• OEM-level quality and dimensions for a straight swap on the right-hand rear position
• Stable vehicle level under load thanks to consistent internal pressure and robust rubber construction
• Refined comfort and confident handling on poor roads, towing or carrying luggage
• Long service life from Bilstein’s proven German engineering and materials
• Designed for models with separate damper and air spring on the rear axle

Real-world results

We have fitted these B3 units to customer X5 E53s with excellent results. Feedback highlights a level stance, smooth ride quality, quieter operation and a noticeable reduction in suspension warnings.

Typical faults this cures

• Right rear corner sitting low or leaning to one side
• “Self‑levelling suspension inactive” or similar chassis warnings
• Air leaks causing the vehicle to drop after parking
• Excessive compressor run time or noisy pump
• Harshness caused by a cracked or perished air bladder

Vehicle compatibility

Fits BMW X5 E53 models built approximately 2000 to 2006, including:

• 3.0i petrol
• 4.4i petrol
• 4.6is petrol
• 4.8is petrol
• 3.0d diesel

Mounting location: rear axle, right side. Series: Bilstein B3 pneumatic bellow. This is not a shock absorber.

What you receive

• 1 x Bilstein B3 right rear air bellow, part number 40-221618

For the opposite side, the matching left-hand rear unit is Bilstein 40-221601. Many owners choose to renew both rear bellows at the same time for balanced performance.

Check before you buy

We will confirm suitability before dispatch. Provide your UK registration or the last 7 digits of your VIN at checkout so we can verify compatibility with your E53 X5.

Professional installation

Need it fitted? MJ Modifications in Warwickshire offers expert installation and setup. Request a quote at info@mjmodifications.co.uk.

Identifiers

• Manufacturer: Bilstein
• Bilstein part number: 40-221618
• SKU reference: BILSTEIN-40-221618
• EAN: 4025258727345
• UPC: 651860728216

Search terms customers use

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Order today and restore the confident, cushioned ride your E53 X5 deserves with Bilstein’s trusted B3 right rear pneumatic bellow.