P1456Auxiliary Emission Controls

EVAP Fuel Tank System Leak (Honda/Acura)

P1456 is a Honda/Acura code for a leak detected in the fuel tank side of the EVAP system, frequently caused by a loose or faulty fuel cap or the fuel tank pressure sensor.

🚗 Yes. This is an EVAP leak code and rarely affects drivability.

LOW

severity

🎯 Top Causes, Ranked by Likelihood

#1Loose or faulty fuel cap$0-$40

45%

A loose or worn cap is the most common cause; tighten or replace it.

#2Faulty fuel tank pressure sensor$50-$200

30%

A bad sensor misreports tank pressure.

#3Cracked hose or tank component$20-$300

25%

A leaking hose or component fails the tank-side test.

🩺 Common Symptoms

Check engine light
Possible fuel odor
No noticeable drivability change
Failed emissions test

💰 Repair Cost: DIY vs Shop

DIY Cost

$0-$200

Shop Cost

$100-$400

📋 Free OBD2 Code Cheat Sheet

The 50 most common codes with likely cause and DIY fix cost. Sent once, no spam.

🔧 How to Diagnose P1456

1Check and tighten or replace the fuel cap

2Inspect fuel tank side EVAP hoses

3Test the fuel tank pressure sensor

4Smoke-test the tank side of the EVAP system

❓ Frequently Asked Questions

Can I drive with P1456?

Yes. It is an EVAP leak code and rarely affects drivability, but it will fail emissions.

Is P1456 a Honda code?

Yes, P1456 is a Honda/Acura EVAP fuel tank system leak code.

What causes P1456?

Most often a loose or faulty fuel cap, followed by a bad tank pressure sensor or leaking hose.

🔗 Related Codes

P1457P0455P0442