2008-2015 Scion xB Rear Coil Springs: A Guide to Ride Height, Sag, and Replacement

Symptoms of Failing Rear Coil Springs

The rear coil springs on the 2008-2015 Scion xB are generally durable. When they do fail, it's typically due to age, metal fatigue, or corrosion from road salt. The symptoms are usually noticeable and shouldn't be ignored.

• Rear-End Sagging: The most obvious sign is a visibly lower ride height in the back of the vehicle, even when it's not carrying any cargo. You might notice that one corner is lower than the other, or the entire rear end looks 'squat'.
• Excessive Bouncing: If the vehicle bounces multiple times after hitting a bump or dip, the springs are likely worn out and no longer able to properly support the vehicle's weight and control movement. This creates an unstable and uncomfortable ride.
• Clunking or Popping Noises: Loud clunking, popping, or rattling sounds from the rear of the car when going over bumps can indicate a broken or unseated coil spring. While these noises can also be caused by worn shock absorbers or sway bar bushings, the springs should be inspected.
• Poor Handling: Worn springs can make the vehicle feel less stable, especially when turning or driving on uneven roads. The vehicle may sway more than usual.
• Uneven Tire Wear: Incorrect ride height from sagging springs changes the suspension geometry, which can lead to accelerated and uneven wear on the rear tires.

Known Issues, TSBs, and Recalls

As of mid-2026, there are no specific recalls or widespread Technical Service Bulletins (TSBs) from Toyota or the NHTSA for failing or breaking rear coil springs on the 2008-2015 Scion xB. The factory springs are considered reliable and not a common failure point. Most issues arise from high mileage or in regions where road salt causes significant corrosion.

A common observation from owners is that the stock Scion xB has a noticeable reverse rake, meaning the rear ride height is significantly higher than the front. This leads many owners to install aftermarket lowering springs to achieve a more level stance, which is a cosmetic choice rather than a fix for a problem.

Buying a Used Coil Spring: What to Check

While new OEM springs are reasonably priced, a good used OEM spring can be a cost-effective option. Unlike some aftermarket parts, a used OEM spring will maintain the factory-specified spring rate and quality. Here’s what to inspect:

• Check for Cracks: This is the most critical inspection. Carefully examine the entire spring, especially the top and bottom coils where moisture can sit. Run your hand along the coil to feel for sharp edges or fractures that might be hidden by paint or light surface rust. A cracked spring is unsafe and unusable.
• Inspect for Heavy Rust and Pitting: Light surface rust is normal for a used suspension part. However, avoid any spring with heavy, flaky rust or deep pitting. This type of corrosion weakens the metal and can lead to a future stress fracture.
• Compare Free Height: If possible, stand the used spring next to your old one (if it's not broken). If the used spring is noticeably shorter, it has sagged and will not restore your vehicle's proper ride height.
• Verify Part Numbers: The correct OEM part number for this generation is 48231-12C21, which supersedes the earlier 48231-12C20. Ensure you are buying the correct part for your vehicle.

Cost Comparison for Rear Coil Spring Replacement

Prices for replacing rear coil springs on a 2008-2015 Scion xB can vary. It is always recommended to replace them in pairs to ensure even ride height and predictable handling.

DIY Replacement Guide (Difficulty: 1/5)

Replacing the rear coil springs on a second-generation Scion xB is one of the easiest suspension jobs you can do. The spring is separate from the shock absorber and does not require a spring compressor, making it very safe for a DIY mechanic.

Estimated Time: 1 hour
Tools Needed: Floor jack, jack stands, wheel chocks, socket set (specifically a 17mm socket), torque wrench.

1. Prepare the Vehicle: Park on a level surface, engage the parking brake, and chock the front wheels. Loosen the lug nuts on the rear wheels.
2. Lift the Vehicle: Use a floor jack to lift the rear of the vehicle by the frame or a central structural point. Place jack stands securely under the frame on both sides, just ahead of the rear wheels. Remove the rear wheels.
3. Support the Rear Axle: Place the floor jack under the center of the rear axle beam and raise it just enough to support its weight. Do not lift the car off the jack stands.
4. Remove Lower Shock Bolts: On both sides, remove the 17mm bolt that secures the bottom of the shock absorber to the axle beam. You may need to raise or lower the axle slightly with the floor jack to relieve tension on the bolts.
5. Lower the Axle and Remove Springs: With the lower shock bolts removed, slowly lower the floor jack. The rear axle will pivot downwards, decompressing the coil springs. Once the axle is low enough, the springs will be loose and can be pulled out by hand. Note the position of the rubber insulators at the top and bottom of the spring; you will reuse them.
6. Install New Springs: Place the rubber insulators on the new springs. Ensure the end of the coil is properly seated in the 'pigtail' or stop on the lower axle perch and upper mount.
7. Raise the Axle and Reinstall Bolts: Slowly raise the axle with the floor jack, making sure the springs stay correctly seated. Align the lower shock mount holes and reinstall the bolts.
8. Torque the Bolts: With the suspension supporting the vehicle's weight (lower the car back onto its wheels or use the jack to compress the suspension), tighten the lower shock bolts.

Frequently Asked Questions (FAQ)