P04EB

EVAP System Small Leak Detected Fresh Air Side

Moderate severity

Same as P04EA but on the fresh-air side - the path between vent valve and atmosphere is not sealing completely during the active test phase.

Common causes

Vent valve does not seal in test mode
One of the most commonly reported causes for this code — check this first.
high
Typical part cost: $90-390
Hose porous or cracked
A plausible cause — test and verify before replacing parts.
medium
Typical part cost: $90-390
See all causes + fix costs
Create a free Wrenchify account to unlock the rest for P04EB.
Unlock causes
Free forever · No credit card

First things to check

1Confirm the code with a scan tool and check for additional related codes.
2Inspect the relevant sensors, wiring, and connectors for damage or corrosion.

Get the full step-by-step diagnosis

Create a free Wrenchify account to unlock the rest for P04EB.

Unlock diagnosis

Free forever · No credit card

Related codes

See related trouble codes

Create a free Wrenchify account to unlock the rest for P04EB.

Unlock related codes

Free forever · No credit card

Frequently asked questions

What does P04EB mean?

P04EB means "EVAP System Small Leak Detected Fresh Air Side". It is a generic OBD-II code that points to a fault in the auxiliary emission controls.

What are the most common causes of P04EB?

vent valve does not seal in test mode; hose porous or cracked — these are the most commonly reported causes. Verify with a proper diagnosis before replacing parts, or use the Wrenchify app for a vehicle-specific diagnosis.

Can I keep driving with this code?

The vehicle is usually drivable for short distances, but the problem can worsen or affect emissions. Diagnose and repair as soon as practical. Use the Wrenchify app for a full diagnosis specific to your vehicle.

Get the full P04EB diagnosis for your vehicle

Year, make, model + step-by-step repair help — free plan included.

Diagnose P04EB