IsItAGoodCar
Reliability Guide

Common Problems with the
2009 Lexus RX (AL10)

The 2009 launch of the third-generation RX (AL10) solidified its position as the quintessential luxury hybrid SUV. It introduced the 'Remote Touch' controller and a more powerful, yet more efficient, 3.5-litre V6 hybrid system.

What changed for 2009

  • •Debut of the all-new third-generation RX.
  • •Introduction of the RX 450h with a more efficient Atkinson-cycle 3.5-litre V6 hybrid powertrain.

Common MOT watch-outs

  • !Wear on suspension components, particularly front lower arm bushes and anti-roll bar links.
  • !Seized rear brake calipers.
4
Known Issues
1
Serious
2
Moderate
1
Minor

All Known Issues

Brake Actuator Failure

SeriousBrakes

The hydraulic brake actuator on the RX 450h can fail over time, manifesting as a barking or squawking noise from the brake pedal area, warning lights on the dashboard, and longer pedal travel. This is an expensive repair, and many UK examples are now beyond goodwill support from Lexus.

Est. Repair Cost: £1,500–£2,500
Warning Signs:

Squawking or buzzing noise when braking, Brake or ABS warning lights illuminated, Longer brake pedal travel than normal

What to Inspect:
  • Press the brake pedal repeatedly while stationary and listen for pump cycling
  • Check for stored ABS or brake-system fault codes
  • Confirm warning lights stay off after a cold start
Verified by IsItAGoodCar Research TeamUpdated

Radiator Leaks

ModerateCooling System

The radiator can leak where the aluminium core meets the plastic end tanks, usually starting as a slow weep before turning into a more obvious coolant loss issue.

Est. Repair Cost: £400–£700
Warning Signs:

Pink crusting around the radiator seams, Sweet coolant smell after a run, Gradually dropping coolant level

What to Inspect:
  • Inspect the lower corners of the radiator with a torch
  • Check the coolant bottle and undertray for dried pink residue
  • Watch the temperature gauge on a full test drive
Verified by IsItAGoodCar Research Team

Radiator End-Tank Seam Splitting and Coolant Loss

ModerateCooling System

The radiator on AL10 RX models can develop leaks where the aluminium core meets the plastic end tanks, usually starting as a slow weep around the bottom corners. Pink coolant crusting around the seams, a sweet coolant smell and a gradually dropping expansion-tank level are the warning signs.

Est. Repair Cost: £400–£700
Warning Signs:

Pink crusting around the radiator seams, Sweet coolant smell after a run, Gradually dropping coolant level

What to Inspect:
  • Inspect the lower corners of the radiator with a torch
  • Check the coolant bottle and undertray for dried pink residue
  • Watch the temperature gauge on a full test drive
Verified by IsItAGoodCar Research TeamUpdated

Remote Touch Controller Wear and Infotainment Lag

MinorInterior & Trim

AL10 RX models use Lexus's mouse-style Remote Touch controller for the central infotainment screen. The mechanism wears over time, producing imprecise cursor movement and laggy inputs. The interface is divisive among UK owners and can be frustrating to use on bumpy roads.

Est. Repair Cost: £200–£700
Warning Signs:

Cursor movement is imprecise or laggy, Inputs are difficult to make while driving, Screen occasionally freezes or responds slowly

What to Inspect:
  • Test the Remote Touch controller across several menus
  • Check cursor precision while the car is stationary and moving
  • Confirm the infotainment screen responds without delay
Verified by IsItAGoodCar Research TeamUpdated

Buying Tips for 2009 Lexus RX (AL10)

  • Listen for a 'clunk' from the steering column when turning at low speeds, which can indicate a worn intermediate shaft.
  • Check the rear wheels for excessive brake dust or heat, indicating seized brake calipers.
2010–2011
Check a 2009 Lexus RX (AL10) by Registration