This sounds like the "What happened?" box on the federal safety agency complaint form. If so, copy and paste this: --- The vehicle repeatedly fails to start after being parked for several days. When it fails, it either clicks with no crank or has no electrical power at all. August 22, 2026 (about 792 miles): The vehicle needed a jump start. The dealer found the 12-volt battery failed a load test and replaced it under warranty. The vehicle was at the dealer August 22–23. October 10, 2026: The vehicle would not turn on and had no power inside. It was at the dealer October 10–16. The problem was not fixed. October 21, 2026: The vehicle went back in for the same problem at a second Lexus dealer, and it is still there as of October 29. The problem continued after the battery was replaced. In total the vehicle has been out of service at least 15 days within its first six months. The dealer suggested driving the car more often, which works around the problem but doesn't fix it. A new vehicle should start after sitting a few days. Other owners of the 2026 IS 350 report the same no-start problem and being given the same advice. I have opened a case with Lexus (Case #261014000097) and sent written notice to the manufacturer.
The worst 2026 Lexus IS problems
Ranked by number of owner complaints. Mileage and cost come from what owners wrote.
- Acceleration1
- Electrical1
Problems by type
Tap a problem to see which part fails, at what mileage and in which other years.
- Acceleration1
- Electrical1
Recalls
No recalls on record for this model year.
Technical service bulletins for the 2026 Lexus IS 20
Bulletins tell dealers how to fix known problems. A warranty extension means the manufacturer pays for that repair for longer.
- Obsolete notice
- Obsolete notice
- A battery in a stored vehicle is subject to conditions that can reduce its performance and service life
- During the manufacturing process, tires are mounted on the vehicle as matched sets to help reduce...
- Obsolete notice
- Long-term or off-site storage requires special care to maintain vehicle condition
- Obsolete notice
- The 2026 model year Lexus vehicles are equipped with driver side floor mat retainers to secure the floor...
- Long-term or off-site storage requires special care to maintain vehicle condition
- Pre-Delivery Service (PDS) is a critical step in satisfying our new car customers
2026 Lexus IS fuel economy
Official EPA estimates in miles per gallon (MPGe for electric). Ranges cover trims that share the same engine.
| Engine | Drive | City | Highway | Combined |
|---|---|---|---|---|
| 3.5L 6‑cyl | AWD | 19 | 26 | 22 |
What 2026 Lexus IS owners say
Most recent owner complaints, unedited.
The digital tachometer lags and delays engine RPM feedback, which makes it difficult to safely monitor vehicle performance while accelerating.
Compare the 2026 Lexus IS
Other model years
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Questions about the 2026 Lexus IS
Is the 2026 Lexus IS reliable?
Owners have filed 2 complaints about the 2026 Lexus IS, fewer than a typical IS model year.
What is the most common problem with the 2026 Lexus IS?
Acceleration and speed control, with 1 complaint. Next is electrical (1).
How many recalls does the 2026 Lexus IS have?
No recalls on record.
What gas mileage does the 2026 Lexus IS get?
Official estimates for the 2026 Lexus IS range from 22 mpg combined. The most efficient version (3.5L 6-cyl, AWD) gets 19 city and 26 highway.
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