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Lexus · Known Issues

2021 Lexus IS Problems: 1 Known Issue

2021 model year · 1,800+ owner reports · Updated September 2026

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Issue summary

According to Au7o's analysis of 1,800+ owner reports, the 2021 Lexus IS has 1 documented issue. None of the listed issues is rated critical; this is not a complete reliability assessment. The most commonly reported issue is Carbon Buildup on Intake Valves (2.0T) with 1,800 owner reports. Across all issues with published estimates, repair costs range from $400 to $800. DIY maintenance guides at au7o.io.

In This Article

  • IS Engine1
  • Recalls1
  • FAQ
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In This Article

  • Engine1
  • Recalls1
  • FAQ

All 1 Known Issue

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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.

This issue also affects: Lexus GS, Lexus LX, Lexus RC

Common Symptoms

  • Rough idle or engine vibration
  • Hesitation on acceleration from stop
  • Reduced power and sluggish throttle response
  • Slight misfire feel at low RPM
  • Decreased fuel economy

How to Fix

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.

Typical repair cost:$400 - $800

Research This Issue

Based on 1,800 owner reports

GoogleRedditYouTubeNHTSA
Community Reported
High Confidence1,800 owner reportsLast reported by owners Jan 2026Reviewed 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.

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Other Lexus Models

Lexus NX18Lexus ES16Lexus GS15Lexus RX14Lexus UX13Lexus LX8

Frequently Asked Questions

What are the most common Lexus IS problems?

According to Au7o's analysis of 1,800+ owner reports, the 2021 Lexus IS has 1 documented issue. The documented issue is: Carbon Buildup on Intake Valves (2.0T). None are rated critical, but regular maintenance is recommended.

Is the Lexus IS reliable?

The 2021 Lexus IS has 1 known issue documented across 1,800+ owner reports. None of the matching records is rated critical; this is not a complete reliability assessment. 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 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.

Data sourced from 1,800+ owner reports, NHTSA recalls, TSBs, and automotive forums.