2018 Lexus GS300

The 2018 Lexus GS 300 is a mid-size luxury sedan known for its comfortable ride, reliability, and luxurious interior. The GS 300 is powered by a 2.0-liter turbocharged inline-4 engine producing 241 horsepower and 258 lb-ft of torque, paired with an 8-speed automatic transmission. Other engine options available in the GS line for 2018 include the GS 350 (3.5L V6) and the GS 450h (3.5L V6 hybrid). Owners generally appreciate the GS 300’s smooth and quiet operation, comfortable seats, and well-appointed cabin. Some common complaints include the somewhat dated infotainment system and limited rear-seat legroom compared to some competitors.

Engine

2.0L Turbocharged Inline-4

• Engine Misfires
  • Description/Symptoms: Engine misfires, rough idling, and the check engine light illuminating. This can be caused by faulty spark plugs, ignition coils, or fuel injectors.
  • Solution: Replacing the faulty spark plugs, ignition coils, or fuel injectors. A diagnostic scan should be performed to pinpoint the exact cause.
  • Estimated Cost to Fix: $100 - $500+ depending on the components needing replacement and labor costs.
  • Recalls: None Found
• Turbocharger Issues
  • Description/Symptoms: Whining or hissing noises from the turbocharger, reduced engine power, and/or the check engine light illuminating. This can be caused by oil leaks, bearing failure, or wastegate malfunction.
  • Solution: Inspect the turbocharger for damage or leaks. Replacement or rebuild of the turbocharger may be necessary.
  • Estimated Cost to Fix: $1,500 - $3,000+ depending on the extent of the damage and whether the turbocharger is replaced or rebuilt.
  • Recalls: None Found

Transmission

8-Speed Automatic

• Rough Shifting
  • Description/Symptoms: Harsh or jerky shifts between gears, particularly during acceleration or deceleration. The vehicle may also hesitate or lurch when shifting.
  • Solution: Begin with a transmission fluid flush and refill using the correct Lexus-specified fluid. If the issue persists, a more in-depth inspection of the transmission may be required, including checking for worn solenoids or valve body issues. In some cases, a transmission rebuild or replacement may be necessary.
  • Estimated Cost to Fix: $200 - $400 for fluid flush. $500 - $1,500+ for solenoid/valve body repair. $3,000 - $6,000+ for transmission rebuild/replacement.
  • Recalls: None Found

Suspension

No Issues Found

Electrical

• Infotainment System Issues
  • Description/Symptoms: The infotainment screen freezes, becomes unresponsive, or glitches. Some users report that the system reboots itself.
  • Solution: Try a system reset by holding down the power button. If that does not fix the issue, software updates can sometimes resolve the problem. In some cases, the infotainment system may need to be replaced.
  • Estimated Cost to Fix: Software updates may be free at the dealership. A replacement infotainment system can cost $1,000 - $3,000+.
  • Recalls: None Found
• Backup Camera Failure
  • Description/Symptoms: The backup camera displays a black screen or a distorted image when the vehicle is put into reverse.
  • Solution: Check the camera lens for debris or damage. If the camera is clean, the wiring or the camera unit itself may be faulty and will need to be repaired or replaced.
  • Estimated Cost to Fix: $200 - $800+ depending on whether it’s a wiring issue or the camera itself needs replacing.
  • Recalls: None Found

Exterior

• LED Headlight Malfunction
  • Description/Symptoms: One or more LED elements in the headlights may fail, resulting in reduced illumination. This can be caused by water intrusion or electrical issues within the headlight assembly.
  • Solution: Inspection of the headlight assembly for damage or water intrusion. Replacement of the entire headlight assembly may be required.
  • Estimated Cost to Fix: $1,000 - $2,500+ per headlight assembly, including parts and labor.
  • Recalls: None Found

Interior

• Navigation System Inaccuracies
  • Description/Symptoms: The navigation system provides incorrect directions, fails to recognize addresses, or loses GPS signal.
  • Solution: Ensure that the navigation system software is up to date. Check the GPS antenna connection for damage or corrosion. Replacement of the GPS antenna may be required.
  • Estimated Cost to Fix: Software updates may be free. GPS antenna replacement: $200 - $500+.
  • Recalls: None Found

Summary

The 2018 Lexus GS 300 is generally a reliable vehicle, but like all cars, it has its share of potential issues. The most common issues appear to be related to the engine, transmission, electrical system, and exterior lighting. While some issues, such as rough shifting or infotainment glitches, may be minor and relatively inexpensive to fix, others like turbocharger failure or headlight malfunction can be more costly. Overall, the severity of issues ranges from minor inconveniences to potentially expensive repairs, so a thorough inspection by a qualified mechanic is recommended before purchasing a used 2018 Lexus GS 300.