Uncovering P0455 on Your 2022 Lexus RX
A P0455 on your 2022 RX (4th generation AL20) signals a large EVAP leak. Whether you have the RX 350 (3.5L V6) or RX 450h (hybrid), the EVAP system uses Toyota/Lexus VSV (Vacuum Switching Valve) technology. Your 4-year/50,000-mile warranty runs through 2026.
Evidence
- Check engine light illuminated
- P0455 stored in ECU
- Possible fuel smell
- Gas cap not clicking
Suspects by Likelihood
- Gas Cap Seal (Very High Likelihood): Worn or not seating. $0–$30 for OEM replacement.
- VSV (Vacuum Switching Valve) (Medium Likelihood): Toyota/Lexus purge control. $130–$280 installed.
- Charcoal Canister (Medium Likelihood): Saturation from overfilling. $250–$450 installed.
- Purge Valve (Low-Medium Likelihood): Sticking or leaking. $120–$260 installed.
- Vapor Pressure Sensor (Low Likelihood): False reading. $150–$300 installed.
Diagnosis
Replace or tighten the gas cap. Drive 2–3 days. If P0455 returns, your Lexus dealer using Techstream diagnostics will identify the fault precisely.
Warranty
Lexus' 4yr/50k warranty runs through 2026. Federal emissions (8yr/80k) covers EVAP through 2030. Check your mileage for coverage.
Safe to Drive?
Yes. P0455 doesn't affect the V6, hybrid system, AWD, or any Lexus features.