2022 Nissan Maxima P0440: EVAP System Diagnosis Guide

P0440 on Your 2022 Nissan Maxima: Closing the Case

Your 2022 Nissan Maxima — one of the final years for this iconic sedan — has triggered a P0440 code. The 3.5L VQ35DE V6 and its EVAP system are mature and well-understood. Let's quickly identify the likely cause and resolution.

Symptoms

• Check engine light on
• Possible fuel odor
• Slight MPG decrease
• Fueling issues
• Emissions failure

Your Maxima performs identically. The V6 and CVT are unaffected.

Causes

1. Gas Cap — Check first. Estimated repair: $5–$20.
2. Purge Volume Control Valve — VQ35 known failure. Estimated repair: $80–$210.
3. Canister Vent Control Valve — Common Nissan component failure. Estimated repair: $90–$225.
4. Leak Detection Pump — Self-test pump. Estimated repair: $150–$350.
5. FTP Sensor — Can drift with age. Estimated repair: $100–$250.

Diagnosis

1. Gas cap check/replacement
2. Full EVAP code scan
3. Component testing
4. Smoke test

Costs

• Gas cap: $5–$20
• PVCV: $80–$210
• Vent control valve: $90–$225
• Leak detection pump: $150–$350
• FTP sensor: $100–$250
• Diagnostic: $80–$150

Safe to Drive?

Yes. Full performance available. P0440 is emissions-only.

DIY or Shop?

Gas cap is easy. Purge valve on the VQ35 is a moderate DIY job. Rear components require more effort. Good community support exists for VQ-powered Nissans.