Investigating P0446 on Your 2022 Lexus RX
A P0446 code on your 2022 Lexus RX points to an EVAP vent control circuit malfunction. The 2022 RX is the final year of the fourth generation, equipped with the 3.5L V6 (RX 350) or hybrid powertrain (RX 450h). Lexus uses a canister close valve (CCV) for EVAP vent control, shared with Toyota's well-proven architecture.
Check your warranty status—the basic warranty (4yr/50k) may still be active. The powertrain warranty (6yr/70k) provides additional coverage through 2028.
Clues and Symptoms
- Check engine light with P0446 stored
- Fuel fill difficulty
- EVAP readiness monitor incomplete
- Hybrid models: EVAP monitors may run less frequently
Top Suspects
- Canister Close Valve (CCV) Failure (High Likelihood): The CCV controls vent flow and can fail electrically or mechanically. Replacement costs $140–$260 if not warranty-covered.
- Purge VSV Malfunction (High Likelihood): Lexus uses a Vacuum Switching Valve for purge control. A sticking VSV disrupts EVAP flow. Replacement runs $120–$230.
- CCV Wiring or Connector (Medium Likelihood): Corrosion or damage at the valve connector. Repair costs $80–$180.
- Charcoal Canister Issues (Medium Likelihood): Canister degradation or saturation. Replacement runs $200–$380.
- Gas Cap Seal (Low Likelihood): Worn seal. Replacement is $15–$30 (Lexus OEM).
How to Investigate
Scan for all stored and pending codes. A Techstream scan at a Lexus dealer provides the most detailed EVAP diagnostics including CCV and purge VSV commanded tests. For DIY, check the gas cap first and inspect the CCV connector. Lexus EVAP systems are Toyota-engineered and highly reliable—a failure suggests a definitive component issue.
Warranty and Cost
The basic warranty (4yr/50k) may still be active. The powertrain warranty (6yr/70k) covers through 2028, and the federal emissions warranty (8yr/80k) through 2030. Under warranty, all repairs are free. Out of pocket: $120–$380.
Safe to Drive?
Yes. P0446 doesn't affect your RX's engine, transmission, AWD, or any luxury features. Full SUV capability is maintained.