Tracking Down the P0440 on Your 2022 Lexus IS
The P0440 code on your 2022 Lexus IS indicates an EVAP system malfunction. Your refreshed sport sedan, available as the IS 300 or IS 350 (and the track-focused IS 500 with the 5.0L V8), uses Toyota/Lexus' proven EVAP system. Let's investigate.
The 2022 IS EVAP System
All engine variants share the same fundamental EVAP architecture:
- Purge VSV — Vacuum Switching Valve for vapor routing
- Canister Close Valve (CCV) — System sealing for leak tests
- Charcoal Canister — Vapor storage
- Vapor Pressure Sensor — In-tank monitoring
- Fuel Filler Cap — Twist-on with rubber gasket
Ranked Suspects
- Gas Cap Seal (30%) — Gasket wear after 2–3 years. Cost: $12–$28.
- Purge VSV (23%) — Most common mechanical failure. Cost: $40–$85, $120–$260 with labor.
- Canister Close Valve (17%) — CCV sealing failure. Cost: $45–$90, $125–$270 with labor.
- EVAP Hose Issues (14%) — Heat and age. Cost: $10–$35, $75–$185 with labor.
- Vapor Pressure Sensor (10%) — In-tank sensor. Cost: $55–$120, $140–$290 installed.
- Charcoal Canister (6%) — Overfilling. Cost: $95–$240, $190–$390 installed.
Diagnostic Steps
- Gas Cap — Inspect, clean, reseat or replace. Clear code and monitor.
- Companion Codes — P0441, P0442, P0446 narrow the search.
- Purge VSV — Engine bay, test operation.
- CCV — Near canister, verify sealing.
- Smoke Test — $80–$150 for definitive results.
Warranty Coverage
Lexus' 4-year/50,000-mile basic warranty should still cover your 2022 IS. The 6-year/70,000-mile powertrain warranty extends further. Verify with your dealer before paying out of pocket.
The Verdict
Your 2022 IS's P0440 follows the standard Toyota/Lexus investigation — gas cap first, then purge VSV and CCV. With warranty coverage likely still active, let your Lexus dealer handle it for free. These are among the most reliable EVAP systems in the industry.