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DTC code

P0456

Evaporative Emission Control System Leak Detected (Very Small Leak)

Technical guide

partially verified

Symptoms

  • Check engine light
  • minor fuel smell

Probable causes

  • EVAP very small leak
  • fuel cap seal
  • tiny crack in hose
  • sensor port leak

Diagnostic steps

  1. Replace fuel cap first.
  2. Detailed smoke test at low pressure.
  3. Inspect all connections.

Cross-checked technical synthesis (QA). It does not replace the manufacturer's procedure.

Models most reported with this code (NHTSA)

Ford Focus 25Jeep Grand Cherokee 9Ford Fusion 9Ford Edge 9Ford Escape 8

Count of distinct owner complaints mentioning the code. US data — same engines, same failures.

AI here is a librarian: this page shows only what mechanics confirmed, or says “unknown”. It never suggests a diagnosis — MECCANIC interprets the code, never your car.

0 confirmed cases on P0456

Nothing confirmed yet for this code. No guess is offered on purpose.

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