Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
Your car has a system that stops gasoline fumes from escaping. There's a part that checks the pressure in this system, and it's not working right now.
The EVAP system prevents fuel vapors from escaping into the atmosphere. The pressure sensor or switch in this system is supposed to monitor the pressure but is currently stuck.
The P143D code indicates that the EVAP (Evaporative Emission Control) system pressure sensor or switch is stuck, meaning it is not responding to changes in pressure as expected. This could prevent the system from correctly managing fuel vapors.
• Check Engine Light is on
• Failed emissions test
• Fuel odor around the vehicle
• Poor fuel economy
• Faulty EVAP pressure sensor
• Wiring issues in the EVAP system
• Malfunctioning EVAP canister
• Blocked or damaged EVAP lines
EVAP: Evaporative Emission Control
OBD-II: On-Board Diagnostics, Second Generation
• Use an OBD-II scanner to confirm the code
• Inspect the EVAP pressure sensor and wiring
• Check for blockages in the EVAP lines
• Test the EVAP canister for proper operation
• Replace the EVAP pressure sensor
• Repair or replace damaged wiring
• Clear blockages in the EVAP lines
• Replace the EVAP canister if necessary
• OBD-II scanner
• Multimeter
• Wrench set
$150 - $400
Moderate
• Toyota Camry
• Honda Accord
• Ford Focus
• Regularly inspect EVAP system components
• Ensure fuel cap is tightly closed
• Perform routine maintenance checks
Sensor Issue
• Get the issue diagnosed by a professional mechanic
• Avoid overfilling the fuel tank
Check with your vehicle manufacturer for warranty coverage on emissions-related components.
This code has been associated with issues in vehicles with aging EVAP systems, especially in areas with high humidity.
Moderate – It won't immediately affect drivability but should be addressed to avoid emissions issues.
Driving with a malfunctioning EVAP system may cause your vehicle to fail emissions tests and could be illegal in some areas.
• Engine running
• Vehicle at operating temperature
The EVAP pressure sensor is typically located near the fuel tank or on the EVAP canister.
Q: What happens if I ignore this code?
A: Ignoring this code may lead to increased emissions, potential fuel odors, and failing an emissions test.
Q: Can I drive my car with a P143D code?
A: Yes, but it is recommended to fix the issue soon to avoid emissions problems and potential fuel economy issues.
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A wired color-screen reader with readiness hotkeys, live data, code definitions, and data logging.
Good for emissions-related codes because it exposes readiness monitors and live powertrain data.
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Specialty · Smoke machine
Helpful for finding EVAP and vacuum leaks that are hard to see with visual inspection alone.
Helpful for tracking down EVAP and vacuum leaks that can trigger emissions faults.
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Specialty · O2 sensor socket
Helpful when the code points toward exhaust or oxygen-sensor work and space is tight.
Useful when the diagnosis points toward oxygen-sensor removal or replacement.
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Fitment Required · Vehicle-fitment part
Relevant when EVAP diagnosis points toward purge-flow or purge-control faults.
EVAP diagnosis often includes purge-flow and valve-control faults.
Confirm the failed valve and exact fitment before buying parts.
View options on AmazonThese parts may be related to this fault category, but a code by itself does not confirm exact fitment or guarantee that replacing a part will solve the problem.