Solving P0440 on Your 2019 Nissan Sentra
Your 2019 Nissan Sentra has set a P0440 code — an EVAP system malfunction. The 2019 Sentra, the final year of the seventh generation with the 1.8L four-cylinder engine, has well-documented EVAP characteristics. After several years of service, certain components are more prone to failure. Let's investigate.
Symptoms
- Check engine light on
- Fuel smell near the car
- Decreased fuel economy
- Fueling issues at the pump
- Emissions test failure
Your Sentra will drive normally. P0440 does not affect the 1.8L engine or CVT.
Causes by Likelihood
- Worn Gas Cap — After 5+ years, the gasket degrades. Estimated repair: $5–$20.
- Purge Volume Control Valve — The PVCV on the 1.8L is a known failure. Estimated repair: $65–$175.
- Canister Close Valve — Nissan's vent control component. Common failure on older Sentras. Estimated repair: $75–$195.
- Leak Detection Pump — The self-test pump degrades over time. Estimated repair: $125–$310.
- Cracked Vapor Hoses — Age-related deterioration. Estimated repair: $30–$110.
Diagnostic Approach
- New gas cap, clear code, drive
- Full EVAP code scan
- Test PVCV and canister close valve
- Check leak detection pump
- Smoke test and visual inspection
Costs
- Gas cap: $5–$20
- PVCV: $65–$175
- Canister close valve: $75–$195
- Leak detection pump: $125–$310
- Hoses: $30–$110
- Diagnostic: $80–$140
Safe to Drive?
Yes. No concerns.
DIY Friendly
The 2019 Sentra is quite DIY-friendly. The 1.8L engine bay has good access to the purge valve. Gas cap is trivial. Seventh-gen Sentra repair guides are widely available online.