AutoCodes - Nissan - P1456 2004 NISSAN SENTRA

P1456 2004 NISSAN SENTRA Code - Evaporative Emission Control System Leak Detected Small Leak

Repair Importance Level: 3/3
Repair Difficulty Level: 3/3
Table of contents

|P1456 2004 NISSAN SENTRA code possible causes

  • Missing Fuel cap
  • Incorrect fuel filler cap used
  • Fuel filler cap remains open or fails to close
  • Foreign matter caught in fuel filler cap
  • Incorrect fuel tank vacuum relief valve
  • Leak is in line between intake manifold and EVAP canister purge volume control solenoid valve.

|How do I fix the P1456 2004 NISSAN SENTRA code?

Check the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector's pins.

|P1456 2004 NISSAN SENTRA code tech notes

Usually, loose or bad fuel tank filler cap will trigger these codes. Retighten fuel tank filler cap and clear the code to repair the problem. There are several Nissan service bulletins for this problem if tighten the gas cap does not repair the problem, check for Nissan Service bulletins for your model year.

There is a factory Nissan service bulletin to help diagnose the P1456 code:
Nissan Factory Service Bulletin OBDII Code P1456

|Cost of diagnosing the P1456 2004 NISSAN SENTRA code

Labor: 1.0

The cost of diagnosing the P1456 2004 NISSAN SENTRA code is 1.0 hour of labor. The auto repair's diagnosis time and labor rates vary by location, vehicle's make and model, and even your engine type. Most auto repair shops charge between $75 and $150 per hour.

|When is the P1456 2004 NISSAN SENTRA code detected?

The P1456 code is detected when the EVAP system has a very small leak.

|What are P1456 2004 NISSAN SENTRA code possible symptoms?

  • Engine Light ON (or Service Engine Soon Warning Light)
  • Possible a noticeable fuel odor caused by the release of fuel vapors

|P1456 2004 NISSAN SENTRA code description

This diagnosis detects leaks in the Evaporative Emission (EVAP) purge line using engine intake manifold vacuum. If pressure does not increase, the Engine Control Module (ECM) will check for leaks in the line between the fuel tank and EVAP canister purge volume control solenoid valve under the following vacuum test condition.
The vacuum cut valve bypass valve is opened to clear the line between the fuel tank and the EVAP canister purge volume control solenoid valve. The EVAP canister vent control valve will then be closed to shut the EVAP purge line off. The EVAP canister purge volume control solenoid valve is opened to depressurize the EVAP purge line using intake manifold vacuum. After this depressurization is implemented, the EVAP canister purge volume control solenoid valve will be closed.
Most Nissan Models EVAP System Diagram
OBDII Code P1456 2004 Nissan Sentra - Evaporative Emission Control System Leak Detected Small Leak - AutoCodes.com

|Need more information with the P1456 2004 NISSAN SENTRA code?

Need more information on how to fix the P1456 2004 NISSAN SENTRA code? Get Access to Factory Service Manuals

|Need help with a P1456 2004 NISSAN SENTRA code?

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|P1456 2004 NISSAN SENTRA code comments

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