Parts for your 2012 Toyota Bb-Steering rack

2012 Toyota bB Steering Rack

Based on Toyota’s Electronic Parts Catalogue (EPC) for the QNC20/QNC21 bB series and the factory repair manual used across Toyota/Daihatsu platforms (shared with the Daihatsu Materia/Subaru Dex), the 2012 Toyota bB is fitted with a rack-and-pinion steering rack paired to electric power steering (EPS, column-assist). So yes, a steering rack is absolutely relevant on this model.

This steering rack converts the driver’s input at the wheel into precise left–right movement via the pinion and inner tie rods, keeping the bB tracking straight and turning cleanly. With EPS doing the assist at the column, the rack itself remains a robust mechanical unit that sets toe angle, centres the wheel, and communicates road feel. There’s no hydraulic hosework on this setup, which means no power steering fluid to top up or leak.

For servicing in Australia and New Zealand conditions, the rack is largely “inspect and keep tidy”. At regular service intervals (every 10,000–15,000 km, or as the workshop recommends), it’s smart to:

• Check rack boots for splits, perishing or grease fling, replace boots and clamps if damaged.
• Test inner and outer tie rods for play and smooth movement, any knock or free-play calls for replacement.
• Listen for clunks on low-speed turns and feel for notchiness at centre, these can indicate wear.
• Confirm wheel alignment and steering wheel centring after any suspension or tyre work.

When replacement is on the cards—whether just inner tie rods or the full steering gear—getting the basics right saves headaches:

• Disconnect the battery and lock the wheel straight-ahead to protect the clock spring.
• Mark toe settings before disassembly, but always finish with a professional alignment.
• Use new rack boots, OE-spec clamps, and quality tie rod ends, torque to spec from the service manual.
• If the subframe is loosened to remove the rack, re-torque all fasteners and recheck alignment.
• After fitting, perform EPS/steering angle initialisation with a suitable scan tool to keep assistance and stability systems happy.

Typical signs the bB’s rack or tie rods are due include wandering on the motorway, uneven tyre wear on the shoulders, a crooked steering wheel after bumps, or a dull clunk over driveways. Catching those early keeps tyres alive, keeps the car safe, and keeps that light, tidy Toyota steering feel intact.

Does the 2012 Toyota bB have a steering rack or a steering box?

It has a rack-and-pinion steering rack with electric power steering assistance at the column. This is confirmed by Toyota’s EPC listings (steering gear assembly in Group 45) and the bB QNC20-series service data.

The layout gives accurate toe control and tidy road feel, while avoiding the weight and service needs of a hydraulic system.

What are common signs the bB’s steering rack or tie rods need attention?

Look for free-play at the wheels, clunks on low-speed turns, wandering at speed, uneven tyre wear, and split rack boots. A steering wheel that won’t centre nicely can also point to wear.

Any of these signs warrant an inspection of inner and outer tie rods, boot condition, and a wheel alignment check.

Does the 2012 bB use power steering fluid?

No. The 2012 bB uses electric power steering, so there’s no hydraulic fluid to service. If fluid is seen near the rack, it’ll usually be engine or transmission oil from elsewhere, or grease escaping a torn boot.

Maintenance focuses on mechanical checks—boots, tie rods, alignment—and periodic EPS calibration after steering work.