IsItAGoodCar
Reliability Guide

Common Problems with the
2025–2026 Lexus LBX

We've identified 2 known issues that can affect the 2025–2026 Lexus LBX. None are considered critical, but they're worth knowing about before you buy.

2
Known Issues
0
Serious
1
Moderate
1
Minor

All Known Issues

12V Auxiliary Battery Parasitic Drain

ModerateElectrics & Electronics

Like several recent Toyota and Lexus hybrid models built on shared electrical architectures, the LBX uses a compact, low-capacity 12V auxiliary battery located beneath the rear seat cushion. Constant background telematics draws from the keyless entry receiver, DCM (Data Communication Module), and Lexus Link+ connected cloud services can discharge this battery in as little as 7 to 10 days of inactivity. When voltage drops below 11.8V, the hybrid ECU cannot boot, preventing the vehicle from entering the READY driving state and requiring an external jump start.

Est. Repair Cost: £150–£300
Warning Signs:

Smart entry touch sensors fail to unlock the doors on approach, Instrument cluster remains black or flashes warning indicators without entering READY mode, Audible relay clicking under the dashboard when pressing the Power button, Lexus Link smartphone app reports critical 12V battery discharge notification

What to Inspect:
  • Test 12V battery resting voltage with a multimeter after the car has been parked for 24 hours
  • Ask the seller if a trickle charger or battery maintainer is used during airport parking or holidays
  • Check dealer service records to confirm the latest DCM telematics software update has been installed
Verified by IsItAGoodCar Research TeamUpdated

Hypersensitive Driver Monitor and ADAS Camera Alerts

MinorElectrics & Electronics

The Lexus Safety System+ suite on the LBX includes a facial recognition Driver Monitor camera mounted directly on top of the steering column housing. UK drivers frequently encounter persistent acoustic chimes and false alert messages on the 12.3-inch digital cluster warning of Driver Inattention or Driver Monitor Unavailable. The system is easily triggered by polarized sunglasses, hands resting near the top of the steering rim, low-angle winter sunlight, or light rain obscuring the windscreen forward-facing camera, requiring frequent menu adjustments.

Est. Repair Cost: £0–£200
Warning Signs:

Repeated warning chimes and amber coffee cup or eye icon appearing on the digital cluster, Driver Monitor Camera Obscured or Unavailable pop-up warnings during normal driving, Temporary deactivation of proactive driving assist and lane keep functions in bright sunlight, Audible speed limit alert chimes sounding unexpectedly after misreading side-road speed signs

What to Inspect:
  • Test drive with your normal driving posture and sunglasses to observe Driver Monitor alert sensitivity
  • Verify that safety assist settings can be configured and saved through the central touchscreen menus
  • Inspect the windscreen glass immediately in front of the forward ADAS camera pod for chips or interior haze
Verified by IsItAGoodCar Research TeamUpdated

Buying Tips for 2025–2026 Lexus LBX

  • If you do predominantly short urban trips or leave the car parked at airports, consider an approved battery trickle charger or solar maintainer to counter 12V auxiliary battery drain.
  • Test rear passenger legroom and boot access carefully; the stylish sloping roofline and hybrid battery packaging make the rear quarters tighter than rivals like the Audi Q2.
  • During your test drive, test the Driver Monitor camera on the steering column in changing daylight conditions to ensure it does not generate incessant false fatigue alerts.
  • Check whether the LBX has had the latest Lexus Link+ multimedia over-the-air firmware updates applied to prevent wireless Apple CarPlay and Android Auto dropouts.
  • Take advantage of the standard Lexus Relax warranty, which rolls forward up to 10 years or 100,000 miles provided annual servicing is carried out at an authorised franchised dealer.
2024
Check a 2025–2026 Lexus LBX by Registration