Lexus RX (AL20) Common Problems & Reliability
The fourth-generation RX feels far more modern than the older car and is usually extremely dependable. The hybrid drivetrain is rarely the problem; most UK ownership issues are wear-related on a heavy luxury SUV or involve the electric tailgate and infotainment hardware.
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Detailed fault breakdown, symptoms, and estimated repair bills by production year.
Most Common Lexus RX (AL20) Faults & Repair Costs
Rear Motor Cable Corrosion ("Cablegate")
On AWD hybrid models, the high-voltage cable connector to the rear motor is prone to severe corrosion from road salt and moisture. If it fails, the car may lose AWD capability and display a hybrid system fault.
Hybrid system warning lights, Loss of AWD functionality, Noisy radio reception (AM band)
- Inspect the rear motor cable connector if possible (requires a lift)
- Ask if the cable has been replaced under the Lexus goodwill program
- Check for the "clamshell" protective cover often fitted as a fix
Rear Brake Disc and Caliper Corrosion
Because the hybrid system handles so much of the slowing, the rear mechanical brakes can corrode and bind if the car mainly does gentle town driving.
Squeal or grinding from the rear, Pitted rear discs, MOT advisories for binding or corroded brakes
- Inspect the rear discs through the wheels
- Feel for heat from one rear wheel after a drive
- Check if the handbrake releases cleanly
Power Tailgate Strut or Spindle Failure
The motorised tailgate can become slow, jerky, or fail to latch properly as the powered struts and spindle mechanisms wear with age.
Tailgate stops part-way, Beeping tailgate warning, Groaning noise as the tailgate opens
- Open and close the tailgate several times from the key and dashboard switch
- Watch for uneven movement from side to side
- Check the boot aperture for signs the tailgate has been manually forced shut
Front Lower Arm Bush Wear
The RX is heavy, and its front lower-arm bushes can soften or tear, leading to vague steering, inner tyre wear, and a dull thump over poor surfaces.
Clonk from the front suspension, Steering feels loose on motorways, Uneven inner-edge front tyre wear
- Drive over patchy roads and listen for a dull front-end knock
- Check the front tyres for feathering on the inside edges
- Inspect suspension arms for split bushes during the underside check
Buying a used Lexus RX (AL20)? Always check for hidden finance and write-off history.
Mechanical problems are only half the battle. Over 1 in 3 UK used cars checked have unpaid finance or accident write-off records that could cause you to lose the car or thousands in value.