1999 Lexus SC400

1999 Lexus SC400 Comprehensive Issue List

The 1999 Lexus SC400 is a grand tourer produced by Lexus. It is powered by a 4.0-liter 1UZ-FE V8 engine paired with a five-speed automatic transmission. The SC400 is known for its smooth ride, luxurious interior, and powerful engine. However, like any vehicle, it has had its share of issues reported by owners.

Engine

• 1UZ-FE V8
  • Intake manifold gasket failure: The intake manifold gasket can fail, causing coolant and oil to leak. Symptoms include overheating, low coolant levels, and oil leaks. Solution: Replacing the intake manifold gasket. Estimated Cost to Fix: $500 - $1,000+
  • Timing belt tensioner failure: The timing belt tensioner can fail, causing the timing belt to skip or break. Symptoms include engine misfires, rough idling, and loss of power. Solution: Replacing the timing belt, tensioner, and related components. Estimated Cost to Fix: $800 - $1,500+
• VVT-i system failure: The Variable Valve Timing with intelligence (VVT-i) system can fail, causing reduced engine performance and fuel economy. Symptoms include poor acceleration, increased fuel consumption, and engine knocking. Solution: Replacing the VVT-i solenoid or other related components. Estimated Cost to Fix: $300 - $800+
• Oxygen sensor failure: The oxygen sensor can fail, affecting the engine’s air-fuel ratio and performance. Symptoms include rough idling, hesitation, and increased fuel consumption. Solution: Replacing the oxygen sensor. Estimated Cost to Fix: $200 - $300+

Transmission

• Five-speed automatic transmission
  • Transmission slipping: The transmission may slip or hesitate during gear changes. Symptoms include delayed or harsh gear changes, and a loss of acceleration power. Solution: Overhauling or replacing the transmission. Estimated Cost to Fix: $2,000+
  • Solenoid failure: The transmission solenoids can fail, causing the transmission to shift erratically or not shift at all. Symptoms include slipping, harsh shifting, and a lack of response. Solution: Replacing the faulty solenoid. Estimated Cost to Fix: $500 - $800+
• Torque converter failure: The torque converter can fail, causing shuddering, slipping, or a loss of power during acceleration. Symptoms include vibrations, overheating, and a lack of responsiveness. Solution: Replacing the torque converter. Estimated Cost to Fix: $1,500 - $2,000+

Suspension

• Front suspension strut failure: The front suspension struts can fail, causing a loss of stability and handling. Symptoms include excessive body roll, dive during braking, and premature tire wear. Solution: Replacing the struts and related components. Estimated Cost to Fix: $600 - $1,200+
• Rear suspension shock failure: The rear suspension shocks can fail, causing a loss of stability and a rough ride over bumps. Symptoms include excessive bounce, sway, and poor handling. Solution: Replacing the shocks and related components. Estimated Cost to Fix: $400 - $800+
• Sway bar link failure: The sway bar links can fail, causing increased body roll and reduced handling. Symptoms include a rattling or clunking noise, especially during cornering or over rough roads. Solution: Replacing the sway bar links. Estimated Cost to Fix: $200 - $400+

Electrical

• Alternator failure: The alternator can fail, causing the battery to drain and the vehicle to lose power. Symptoms include dimming lights, a weak or dead battery, and a warning light on the dashboard. Solution: Replacing the alternator. Estimated Cost to Fix: $500 - $1,000+
• Starter failure: The starter can fail, preventing the engine from starting. Symptoms include a clicking noise when turning the ignition key, or no sound at all. Solution: Replacing the starter. Estimated Cost to Fix: $400 - $700+
• Electrical wiring harness damage: The electrical wiring harness can become damaged, causing various electrical problems. Symptoms can range from flickering lights to power loss. Solution: Repairing or replacing the faulty wiring. Estimated Cost to Fix: Varies depending on the extent of damage

Exterior

• Headlight condensation: The headlights can experience condensation buildup inside the lenses. Symptoms include fogging or water droplets inside the headlights. Solution: Replacing the headlight lenses or installing aftermarket LED or HID lights. Estimated Cost to Fix: $300 - $600+
• Door handle failure: The door handles can fail to open properly, especially in cold weather. Symptoms include sticking or broken door handles. Solution: Replacing the door handles. Estimated Cost to Fix: $200 - $400+
• Trunk gasket failure: The trunk gasket can fail, allowing water or dust to enter the trunk. Symptoms include water in the trunk, a musty smell, or dirt accumulating. Solution: Replacing the trunk gasket. Estimated Cost to Fix: $100 - $200+

Interior

• Climate control failure: The climate control system can fail, causing heating or cooling issues. Symptoms include inconsistent temperature, malfunctioning vents, or a lack of airflow. Solution: Repairing or replacing the climate control module or related actuators. Estimated Cost to Fix: $500 - $1,000+
• Navigation system failure: The navigation system can fail, losing functionality or becoming inaccurate. Symptoms include a blank screen, outdated maps, or errors in route guidance. Solution: Replacing the navigation system or updating the software. Estimated Cost to Fix: $500 - $2,000+
• Power window failure: The power window motors or switches can fail, preventing the windows from operating properly. Symptoms include windows that do not roll up or down, or switches that do not respond. Solution: Replacing the faulty motor or switch. Estimated Cost to Fix: $200 - $500+

Summary

The 1999 Lexus SC400 is a generally reliable vehicle, but like all vehicles, it has its share of issues. Some of the more common problems include engine intake manifold gasket failure, transmission slipping, and electrical wiring harness damage. However, these issues can vary in severity and cost of repair depending on the specific problem and the condition of the vehicle. Overall, the SC400 is still a popular choice for those looking for a luxurious and sporty grand tourer.