P0455 on Your 2024 Lexus NX
A P0455 on your 2024 NX (AZ20) means a large EVAP leak. Available as the NX 250, NX 350, NX 350h, or NX 450h+ PHEV, all share the EVAP system and are fully under warranty. Gas cap first.
Symptoms
- Check engine light with P0455
- Possible fuel smell
- Gas cap not clicking
- EVAP monitor incomplete
Top Causes
- Gas Cap Seal (Very High Likelihood): Loose or factory defect. Warranty-covered.
- VSV (Vacuum Switching Valve) (Medium Likelihood): Lexus purge control. Warranty-covered.
- Charcoal Canister (Low-Medium Likelihood): Factory issue. Warranty-covered.
- Purge Valve (Low Likelihood): Defect. Warranty-covered.
- ECU Software (Low Likelihood): Calibration update. Warranty-covered.
What to Do
Tighten the gas cap and drive 2–3 days. If P0455 persists, your Lexus dealer will diagnose and repair free under warranty using Techstream.
Warranty
Your 2024 NX is covered by Lexus' 4-year/50,000-mile warranty through 2028. Federal emissions (8yr/80k) extends through 2032.
Safe to Drive?
Yes. P0455 doesn't affect the turbo, hybrid system, AWD, or any features.