2018 model year · 8,900+ owner reports · Updated April 2026
According to Au7o's analysis of 8,900+ owner reports, the 2018 Lexus IS has 3 documented known issues. No issues are rated critical, indicating generally reliable ownership. The most commonly reported issue is Fuel Pump Impeller Failure (Recall) with 5,000 owner reports. Across all issues, repair costs range from $400 to $800. DIY maintenance guides at au7o.io.
On the 2014-2020 Lexus IS, the Aisin 8-speed automatic transmission in the third-generation IS exhibits harsh or jerky shifts, particularly during low-speed 1-2 and 2-3 upshifts and when downshifting for deceleration. The transmission control module programming prioritizes fuel economy over smoothness, leading to abrupt gear changes that are felt prominently in the cabin.
Visit the dealer for a transmission ECU reprogramming that smooths shift points and torque converter lockup behavior. Perform a transmission fluid drain-and-fill with Toyota WS fluid every 40,000 miles. If harsh shifting persists after the reflash, the valve body may need replacement.
Parts and tips from 2,100+ owners who fixed this issue
On the 2016-2022 Lexus IS 2.0L 8AR-FTS Turbo, the direct-injected 2.0L turbo four-cylinder in the IS200t/IS300 accumulates heavy carbon deposits on the intake valves since fuel is not sprayed over the valves to clean them. This leads to rough idle, hesitation under acceleration, and reduced power output typically between 40,000-80,000 miles.
Perform a walnut shell blasting of the intake valves to remove carbon deposits. This requires removing the intake manifold and using specialized media blasting equipment. Plan to repeat every 40,000-60,000 miles. Using a quality catch can helps slow the buildup rate.
Parts and tips from 1,800+ owners who fixed this issue
FUEL SYSTEM, GASOLINE:DELIVERY:FUEL PUMP
Toyota Motor Engineering & Manufacturing (Toyota) is recalling certain 2015-2022 Lexus RC, 2016-2020 GS, and 2022 IS vehicles. The low-pressure fuel pump inside the fuel tank may fail.
Enter your VIN at NHTSA.gov to check recalls specific to your vehicle.
Don't see your problem? Describe your symptoms to get a diagnosis, or get a full repair guide.
According to Au7o's analysis of 8,900+ owner reports, the 2018-2018 Lexus IS has 3 documented issues. The most frequently reported are: 8-Speed Automatic Harsh Shifting, Carbon Buildup on Intake Valves (2.0T), Fuel Pump Impeller Failure (Recall). None are rated critical, but regular maintenance is recommended.
The 2018-2018 Lexus IS has 3 known issues documented across 8,900+ owner reports. No issues are rated critical, suggesting generally good reliability. Regular maintenance following the manufacturer's schedule helps prevent many common problems.
Repair costs for known Lexus IS issues range from $400 to $800, depending on the specific problem and whether you choose DIY or professional repair. Au7o provides step-by-step DIY maintenance guides that can help reduce repair costs.
The low-pressure fuel pump impeller can deform due to excessive fuel absorption, causing the fuel pump to become inoperative. This results in engine stalling while driving or inability to start, creating a serious safety hazard. Toyota/Lexus issued a massive recall (20V-863) affe… Severity: critical.
The Aisin 8-speed automatic transmission in the third-generation IS exhibits harsh or jerky shifts, particularly during low-speed 1-2 and 2-3 upshifts and when downshifting for deceleration. The transmission control module programming prioritizes fuel economy over smoothness, lea… Severity: medium.
The direct-injected 2.0L turbo four-cylinder in the IS200t/IS300 accumulates heavy carbon deposits on the intake valves since fuel is not sprayed over the valves to clean them. This leads to rough idle, hesitation under acceleration, and reduced power output typically between 40,… Repairs typically run $400-$800. Severity: medium.
Content on this page was compiled with AI assistance using NHTSA complaints, TSBs, owner reports, and public automotive data. While we strive for accuracy, this information may contain errors. Always verify repair procedures and specifications with your vehicle's service manual or a qualified mechanic.
