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
OEM Diagnostic Flowchart
Scroll to load technician if/then branches.
Read live data and freeze frame for P0451 to pinpoint the cause before buying parts.
TopScan
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DIYers who want phone-based scanning
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ArtiLink600
$99
DIYers working on ABS/airbag systems
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Parts & Tools for This Job
Common parts shoppers buy for P0451 EVAP Pressure Sensor Range/Performance.
Oxygen Sensor
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Catalytic Converter
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EVAP Purge Valve
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Gas Cap
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Turn This Into a Confident Next Step
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View factory recommended tools
OBD2 scanner
Read codes and freeze-frame data before you guess at the fault.
Most diagnostic jobs start with a scan tool and a verified code path.
Check SpecificationsBattery tester
Check cranking and charging health before replacing expensive parts.
A weak battery can mimic alternator or starter problems.
Check SpecificationsMultimeter kit
Confirm voltage, continuity, and sensor power with one simple kit.
A meter is the cheapest way to rule out a bad circuit fast.
Check SpecificationsRelated Resources
Repair guides, symptom pages, and wiring diagrams related to P0451.
OEM Manual Evidence
Browse →EVAP DTCS — 2013 Acura MDX 3.7L Eng VIN 2 Service Manual ~ LEMON Manuals LEMON Manuals: Repair Knowledge Reimagined Home >> Acura >> 2013 >...
EVAP DTCS — 2013 Acura MDX 3.7L Eng VIN YD2 Service Manual ~ LEMON Manuals LEMON Manuals: Repair Knowledge Reimagined Home >> Acura >> 2013...
Engine Control System - Advanced DTCS — 2013 Acura RDX 3.5L Eng VIN 3 Service Manual ~ LEMON Manuals LEMON Manuals: Repair Knowledge Reimag...
Engine Control System DTCS — 2013 Acura RDX 3.5L Eng VIN 3 Service Manual ~ LEMON Manuals LEMON Manuals: Repair Knowledge Reimagined Home >...
Related Symptoms
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Open the exact vehicle hub grounded by OEM manual evidence related to P0451.
Open the exact vehicle hub grounded by OEM manual evidence 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
Published by AllOEMManuals, founded by Lyndon Bedford, an automotive technician with 20 years of experience. He owned and operated a mechanic shop in Hurst, Texas from 2014 to 2022 and continues hands-on repair work.
Content may combine manual references, general repair templates, and AI-assisted drafting. Confirm the source, vehicle configuration, and applicability before working. Report corrections through our contact page.
Last updated: 2026-10-30