2008-2011 Scion xD Rear Coil Spring: Fixing Sag and Diagnosing Noises
This guide covers the common failure symptoms of rear coil springs on the Scion xD, how to replace them, and how to tell if your problem is a more serious axle issue.
- A sagging rear or inward-leaning wheel could be a cracked rear axle beam, a critical safety issue on the xD that must be ruled out first.
- Always replace rear coil springs in pairs to ensure a level ride height and stable handling.
- Replacement is a simple DIY job for this vehicle, as the spring is separate from the shock and requires no special compressor.
- The correct OEM part number is 48231-52D21, which fits 2008-2011 Scion xD models.
Symptoms of a Failing Rear Coil Spring
Coil springs are simple, durable components, but they can wear out, sag, or even break over time, especially on higher-mileage vehicles or those driven in areas with harsh road conditions and road salt. Here are the most common signs that your 2008-2011 Scion xD may need new rear coil springs.
- Sagging Rear End: The most obvious symptom is a noticeable drop in the rear ride height. The car may look like it's squatting, even with no weight in the trunk or back seat. This indicates the springs have lost their ability to support the vehicle's weight.
- Vehicle Leaning: If one spring fails or sags more than the other, the car may lean to one side when parked on a level surface.
- Bottoming Out and Harsh Ride: Worn springs can't absorb impacts effectively. You may hear a loud bang or feel a harsh jolt as the suspension runs out of travel and hits the bump stops when going over bumps or potholes.
- Clunking or Rattling Noises: A broken coil spring can shift in its seat, creating a clunking or rattling sound from the rear of the vehicle, especially over uneven pavement.
- Uneven Tire Wear: Incorrect ride height from sagging springs throws off the suspension geometry, which can lead to accelerated and uneven wear on the inside edge of the rear tires.
Warning: A cracked rear axle beam is a known, serious issue on the Scion xD that can be mistaken for a bad spring. If you notice the top of a rear wheel leaning significantly inward (called negative camber) or severe inner tire wear, carefully inspect the rear axle beam for cracks, especially near the welds where the wheel hub assembly attaches. A failed axle beam is a critical safety failure that can cause a loss of control.
Buying a Used Rear Coil Spring
Since coil springs are simple, durable steel parts, a high-quality used OEM spring is often a better choice than a cheap, new aftermarket part. Aftermarket springs may not have the exact same spring rate (stiffness) as the original, potentially altering ride height and handling. Here’s what to check when buying a used OEM spring:
- Visual Inspection for Cracks: Carefully examine the entire spring, paying close attention to the very top and bottom coils where they sit in the perches. This is where stress fractures most commonly occur.
- Check for Heavy Rust and Pitting: Surface rust is normal, but avoid any spring with deep, flaky rust or pitting. Severe corrosion weakens the metal and can lead to a sudden fracture.
- Compare Free Height: If possible, stand the used spring next to a new one or the other used spring from the pair. They should be the same height. A visibly shorter spring has sagged and should not be used.
- Verify Part Number: Ensure the part number matches your vehicle's requirements. For the 2008-2011 Scion xD, the correct part is 48231-52D21, which supersedes the older 48231-52D20.
- Inspect Rubber Insulators: The OEM springs have rubber insulators at the top and sometimes the bottom. Make sure these are included and are not cracked, torn, or flattened. A bad insulator can cause noise.
Replacement Difficulty & Procedure
Replacing the rear coil springs on a 2008-2011 Scion xD is a straightforward job because the spring is separate from the shock absorber. No special spring compressor tool is required.
- Difficulty: 2 out of 5
- Estimated Time: 1-2 hours
- Is it DIY Feasible?: Yes, for a mechanic with basic tools.
Basic Steps:
- Safely lift the rear of the vehicle and support it on jack stands.
- Remove the rear wheels.
- Place a floor jack under the center of the rear axle beam for support.
- Remove the lower mounting bolt from both rear shock absorbers. This will allow the axle to drop down.
- Slowly lower the floor jack, letting the axle hang down. This will decompress the coil springs.
- The coil springs should now be loose enough to be pulled out by hand. Note the orientation of the rubber insulators.
- Transfer the rubber insulators to the new springs and seat them correctly in the upper and lower perches.
- Raise the axle with the floor jack, guiding the springs into position.
- Re-install the lower shock absorber bolts.
- Re-install the wheels, lower the vehicle, and torque the lug nuts to factory specification.
Pro Tip: It is highly recommended to replace coil springs in pairs (both left and right) to ensure an even ride height and balanced handling characteristics. Mismatched springs can cause the vehicle to lean and handle unpredictably.
Cost Comparison
Replacing the rear coil springs is relatively inexpensive, especially if you perform the labor yourself. Here is an approximate cost breakdown:
| Part Type | Estimated Cost (Per Pair) |
|---|---|
| New OEM | $200 - $220 |
| New Aftermarket | $50 - $100 |
| Used OEM | $50 - $90 |
| Shop Labor | $150 - $250 |
Known Issues, Recalls, and TSBs
There are no official recalls or Technical Service Bulletins (TSBs) from Toyota/Scion specifically for the rear coil springs on the 2008-2011 Scion xD. However, as mentioned, owner complaints point to a serious issue with the rear axle beam cracking due to rust. Any diagnosis of rear suspension sag or noise should include a thorough inspection of this component.
Frequently Asked Questions (FAQ)
Do I need to replace both rear springs at the same time?
Yes. It is always recommended to replace coil springs as a pair for the same axle. A new spring will have a different height and stiffness than an old, worn spring on the other side, causing the car to sit unevenly and handle poorly.
Is a wheel alignment needed after replacing rear coil springs?
While the Scion xD has a non-adjustable solid rear axle, replacing sagged springs will change the ride height. This change can affect the front-end alignment. It is a good practice to have the alignment checked after performing significant suspension work.
What's the difference between a coil spring and a shock absorber?
The coil spring supports the vehicle's weight and absorbs large impacts. The shock absorber (or strut) is a hydraulic damper that controls the bouncing motion of the spring. A bad spring causes sag, while a bad shock causes excessive bounciness. They work together but perform different functions.
Can I use lowering springs instead of the stock ones?
Yes, many companies offer aftermarket lowering springs for the Scion xD. However, be aware that lowering springs will make the ride firmer and reduce ground clearance. They should also be paired with shock absorbers designed to work with a lower ride height for best performance and longevity.
Technical Specifications
OEM Part Numbers: 48231-52D21 48231-52D20
Fits left or right rear position. Designed for use with separate shock absorber on a torsion beam rear axle.
The information in this article is provided for general reference and educational purposes only. Vehicle specifications, procedures, and part compatibility can vary by production date, trim level, and region. Always consult your vehicle's factory service manual and verify part numbers before purchasing or performing repairs. Safety-critical components such as airbags, seat belts, and braking systems should be installed by a qualified professional.
- Scion xD: