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Code
P0451
Evaporative emissions

EVAP pressure sensor range / performance

The EVAP pressure reading is out of range.

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Most likely causes

  1. Faulty pressure sensor
  2. Pinched vent line
  3. Wiring fault

Symptoms you may notice

  • Check engine light

Checks to run

  1. Test the sensor
  2. Inspect the vent line
  3. Check wiring

Tools you may need

Multimeter
Always diagnose before replacing. Codes share symptoms; confirm the cause with measurements before buying parts.

Related codes in Evaporative emissions

P0442

Small leak in EVAP system

 P0446

EVAP vent valve control circuit malfunction

 P0455

Large leak in EVAP system

 P0456

Very small leak in EVAP system

 P0453

EVAP pressure sensor high input
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