P0451
Low SeverityEVAP Pressure Sensor Range/Performance
EVAP System
P0451 — Instant Answer
EVAP Pressure Sensor Range/Performance
Severity: LOW SEVERITY
Meaning: Fuel tank pressure sensor readings are erratic or out of range.
Safe to drive? Usually yes with caution, but confirm root cause before long trips.
Estimated repair cost: $30 - $80
Most common causes:
- 1. Failing pressure sensor (35-45% of cases)
- 2. Intermittent connection (10-25% of cases)
Common Causes
How to Diagnose P0451
- 1Check connector
- 2Monitor sensor readings
- 3Replace sensor
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Repair guides, symptom pages, and wiring diagrams related to P0451.
Related Codes
Frequently Asked Questions
- Can altitude affect fuel tank pressure?
- Yes — driving up mountains changes ambient pressure, but the ECM compensates for this.
- Is this sensor related to fuel gauge?
- No — the fuel tank pressure sensor monitors vapor pressure, not fuel level.
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Author & Review
Written by AllOEMManuals Editorial Team. Reviewed by ASE-certified technicians and updated with factory-reference checks for fitment-sensitive steps.
This guide was drafted with AI assistance and reviewed for accuracy by a human editor.
Last updated: 2026-05-07