Electrical System Failure (Audio Amplifier)

Water intrusion into the audio amplifier, typically located in the trunk, can cause a complete loss of audio, system malfunctions, and a burning odor. This is often due to leaks from sunroof drains, window seals, or trunk lid seals. Estimated repair cost: $300 - $800.

Premature Inner Tire Wear

Premature inner tire wear has been reported, often attributed to suspension geometry and soft lower control arm bushings. Bridgestone tires have also been mentioned in relation to separation issues. Estimated repair cost: $150 - $400 (alignment and tire rotation).

HVAC Servo Motor Malfunction

Issues with HVAC servo motors can lead to improper air distribution, with air blowing from unintended vents or reduced airflow. While some servo motors were subject to a customer support program, recurrence is possible. Estimated repair cost: $200 - $500.

Sudden Unintended Acceleration

While rare, reports of sudden unintended acceleration have been noted. This can be linked to faulty throttle bodies, accelerator pedal sensors, software glitches, or even floor mat interference. Estimated repair cost: $500 - $1,500.

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2015 Lexus IS Maintenance guide

Name: Maintenance dataset for 2015 Lexus IS
Creator: Carfocal

v1.0Updated May 30, 2026Ryan Davis4 Sources Analyzed

MAINTENANCE SUMMARY

The 2015 Lexus IS, while generally reliable, presents specific maintenance considerations. Owners should be particularly attentive to the electrical system, with reports of water intrusion into the audio amplifier causing system failures and a burning odor.

View Critical Issue: Steering System Stiffness or Binding

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Reliability Score

Est. Annual Maintenance Cost

$600 - $800

TSBs & Recalls

3 TSBs | 0 Recalls

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Key Takeaways

Prioritize inspection of the electrical system, particularly the audio amplifier, for signs of water intrusion.
Regularly check the steering system for any stiffness or unusual feedback.

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Critical service intervals

Common failure analysis

Symptoms and prevention guidance