According to Au7o's analysis of 8,900+ owner reports, the 2018 Lexus IS has 3 documented known issues, with 1 rated critical. The most serious is Fuel Pump Impeller Failure (Recall). 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 2018-2020 Lexus IS, 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) affecting over 1.8 million vehicles across multiple models.
Replace the fuel pump assembly at any Lexus dealer free of charge under recall 20V-863. The dealer replaces the entire fuel pump with an updated unit that uses a redesigned impeller. If you have not received a recall notice, contact your dealer with your VIN to verify eligibility.
What Owners Are Using
Parts and tips from 5,000+ owners who fixed this issue
NoteThis is a safety recall — do not delay getting the fuel pump replaced. Engine stalling at highway speed has caused multiple accidents. Check NHTSA.gov with your VIN for recall status.
High Confidence5,000 reportsLast reported by owners Jun 2025Reviewed Mar 2026
Community Reported
1,800 owners
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.
What Owners Are Using
Parts and tips from 1,800+ owners who fixed this issue
UpgradeJLT Performance oil catch can — catches oil vapor before it reaches the intake valves, significantly reducing carbon buildup between walnut blasting services. (JLT Performance #JLT-3012P)
High Confidence1,800 reportsLast reported by owners Jan 2026Reviewed Mar 2026
Community Reported
2,100 owners
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.
Transmission hesitation when accelerating from a stop
How to Fix
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.
What Owners Are Using
Parts and tips from 2,100+ owners who fixed this issue
TipA fluid drain-and-fill with genuine Toyota WS ATF makes a noticeable difference in shift quality. Do not flush — just drain and refill 4-5 quarts.
Medium Confidence2,100 reportsLast reported by owners Dec 2025Reviewed Mar 2026
⚠️NHTSA Recalls1 recall
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.
Campaign #26V22200008/04/2026
Enter your VIN at NHTSA.gov to check recalls specific to your vehicle.
According to Au7o's analysis of 8,900+ owner reports, the 2018-2018 Lexus IS has 3 documented issues. The most frequently reported are: Fuel Pump Impeller Failure (Recall), 8-Speed Automatic Harsh Shifting, Carbon Buildup on Intake Valves (2.0T). Of these, 1 is rated critical and should be addressed promptly.
Is the Lexus IS reliable?
The 2018-2018 Lexus IS has 3 known issues documented across 8,900+ owner reports. 1 issue is rated critical: Fuel Pump Impeller Failure (Recall). Prospective buyers should inspect for these issues and factor potential repair costs into their purchase decision. Regular maintenance following the manufacturer's schedule helps prevent many common problems.
How much does it cost to fix common Lexus IS 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.
What is the 2018-2020 Lexus IS Fuel Pump Impeller Failure (Recall)?
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: high.
What is the 2014-2020 Lexus IS 8-Speed Automatic Harsh Shifting?
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.
What is the 2016-2022 Lexus IS Carbon Buildup on Intake Valves (2.0T)?
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.
