AutoCodes – Honda – P0451 1999 Honda Civic

P0451 1999 Honda Civic Code - Fuel Tank Pressure Sensor Range/Performance

Quick Answer

The Fuel Tank Pressure (FTP) pressure sensor detects pressure in the purge line. Common causes include Fuel Tank Pressure Sensor, Fuel Tank Pressure sensor harness is open or shorted, Fuel Tank Pressure sensor circuit poor electrical connection. Severity is Low - monitor the vehicle and repair when practical. The vehicle can usually be driven if no severe symptoms are present, but symptoms should be checked before extended driving.

What it means: P0451 1999 Honda Civic indicates Fuel Tank Pressure Sensor Range/Performance.
Common causes: Common causes include Fuel Tank Pressure Sensor, Fuel Tank Pressure sensor harness is open or shorted, Fuel Tank Pressure sensor circuit poor electrical connection.
Severity: Low - monitor the vehicle and repair when practical.
Can I drive?: The vehicle can usually be driven if no severe symptoms are present, but symptoms should be checked before extended driving.

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Code Popularity 8,339

How popular is this code, among other codes? Low

Repair Importance Level

Low (Monitor) (1 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jun 14, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P0451 1999 Honda Civic Description

The Fuel Tank Pressure (FTP) pressure sensor detects pressure in the purge line. The sensor output voltage to the Engine Control Module (ECM) increases as pressure increases.

OBDII Code P0451 1999 Honda Civic - Fuel Tank Pressure Sensor Range/Performance - AutoCodes.com — P0451 1999 Honda Civic Code - Fuel Tank Pressure Sensor Range/Performance

What does this mean?

What are the Possible Causes of the DTC P0451 1999 Honda Civic?

Fuel Tank Pressure Sensor
Fuel Tank Pressure sensor harness is open or shorted
Fuel Tank Pressure sensor circuit poor electrical connection
Faulty Engine Control Module (ECM)

How to Fix the DTC P0451 1999 Honda Civic?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0451 1999 Honda Civic code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the P0451 1999 Honda Civic code?

Need more information on how to fix the P0451 1999 Honda Civic code? Get Access to Factory Service Manuals

Need Help with the Code?

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P0451 1999 Honda Civic Code

1. What are the common symptoms of OBDII code P0451 on a 1999 Honda Civic?

The common symptoms of OBDII code P0451 on a 1999 Honda Civic include the check engine light illuminating on the dashboard and potential issues with the vehicle's fuel economy.

2. What does the OBDII code P0451 indicate on a 1999 Honda Civic?

OBDII code P0451 on a 1999 Honda Civic indicates a problem with the Fuel Tank Pressure Sensor Range/Performance.

3. What are the possible causes of OBDII code P0451 on a 1999 Honda Civic?

Possible causes of OBDII code P0451 on a 1999 Honda Civic include a faulty fuel tank pressure sensor, damaged wiring or connectors related to the sensor, or issues with the evaporative emissions system.

4. How can I diagnose the OBDII code P0451 on my 1999 Honda Civic?

Diagnosing OBDII code P0451 on a 1999 Honda Civic involves using an OBDII scanner to retrieve the code, inspecting the fuel tank pressure sensor and its wiring, and checking the evaporative emissions system for any leaks or malfunctions.

5. Can I still drive my 1999 Honda Civic with OBDII code P0451?

It is generally safe to drive your 1999 Honda Civic with OBDII code P0451, but it is recommended to address the issue promptly to prevent any potential damage to the vehicle's emissions system.

6. How do I repair OBDII code P0451 on my 1999 Honda Civic?

To repair OBDII code P0451 on a 1999 Honda Civic, you may need to replace the fuel tank pressure sensor, repair any damaged wiring or connectors, or address any leaks in the evaporative emissions system.

7. Are there any DIY tips for fixing OBDII code P0451 on a 1999 Honda Civic?

While some basic troubleshooting steps can be done DIY, it is recommended to consult a professional mechanic for accurate diagnosis and repair of OBDII code P0451 on a 1999 Honda Civic.

8. How much does it cost to fix OBDII code P0451 on a 1999 Honda Civic?

The cost of fixing OBDII code P0451 on a 1999 Honda Civic can vary depending on the specific issue causing the code, the cost of parts needed for repair, and labor charges from a mechanic.

9. Can OBDII code P0451 on a 1999 Honda Civic cause any further damage if left untreated?

If left untreated, OBDII code P0451 on a 1999 Honda Civic can potentially lead to decreased fuel efficiency, emissions issues, and further damage to the vehicle's emissions system over time.

10. How often does OBDII code P0451 occur in a 1999 Honda Civic?

OBDII code P0451 can occur sporadically in a 1999 Honda Civic due to various factors affecting the fuel tank pressure sensor and evaporative emissions system. Regular maintenance and inspections can help prevent this code from recurring frequently.