Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
This code means that the car's computer found a problem with the system that checks for fuel vapor leaks after the car is turned off.
The EVAP system is responsible for capturing and storing fuel vapors from the fuel tank and preventing them from escaping into the atmosphere. The afterrunning diagnosis checks for leaks or issues after the engine is turned off.
The P143F code is triggered when the vehicle's onboard diagnostics system detects a fault in the EVAP system's ability to perform its afterrunning checks. This involves monitoring the system's ability to maintain pressure and detect leaks or malfunctions after the engine has been turned off.
• Check Engine Light is on
• Fuel odor from the vehicle
• Failed emissions test
• Faulty EVAP purge valve
• Leaking or damaged EVAP hoses
• Defective fuel tank pressure sensor
EVAP: Evaporative Emission Control System
Purge Valve: A component that controls the flow of fuel vapors from the canister to the engine.
• Use an OBD-II scanner to confirm the code.
• Inspect the EVAP system for damaged hoses or components.
• Test the EVAP purge valve and fuel tank pressure sensor for proper operation.
• Replace the faulty EVAP purge valve.
• Repair or replace damaged EVAP hoses.
• Replace the defective fuel tank pressure sensor.
• OBD-II scanner
• Vacuum pump
• Multimeter
$100 - $400
Moderate
• BMW 3 Series
• BMW 5 Series
• BMW X5
• Regularly inspect EVAP system components.
• Ensure gas cap is tightly secured after refueling.
• Perform routine vehicle maintenance checks.
Emissions Control System
• Avoid topping off the fuel tank.
• Check for fuel odors and address them promptly.
Check with your vehicle manufacturer for specific warranty coverage related to emissions systems.
This code is commonly associated with BMW vehicles and is often related to issues with the EVAP system components.
Moderate – Addressing this code is important to prevent potential emissions issues and ensure the vehicle passes emissions testing.
Driving with an active EVAP system fault may result in increased emissions, which can be illegal in some regions.
• Engine off
• System at operating temperature
The EVAP system components are typically located near the fuel tank and along the fuel lines.
Q: Can I drive with a P143F code?
A: While the vehicle may still be drivable, it's important to address the issue to avoid emissions problems and potential fuel odors.
Q: Will a P143F code affect my vehicle's performance?
A: This code primarily affects emissions and may not impact performance, but it should be fixed to ensure compliance with emissions regulations.
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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.