P0442 1999 Ford F150 Code - Evaporative Emission System Leak Detected Small Leak
Quick Answer
The Engine Control Module (ECM) tests the Evaporative Emission (EVAP) system for the following conditions: - Large and small leaks - Excess vacuum - Purge flow during non-commanded conditions - Fuel Level and Fuel Pressure sensor faults - EVAP Purge and Vent Valve faults The ECM monitors the Fuel Tank Pressure sensor in order to determine the level of vacuum/pressure in the EVAP system. Common causes include Missing or loose fuel cap, Incorrect fuel filler cap used, Fuel filler cap remains open or fails to close. 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
- P0442 1999 Ford F150 indicates Evaporative Emission System Leak Detected Small Leak.
- Common causes
- Common causes include Missing or loose fuel cap, Incorrect fuel filler cap used, Fuel filler cap remains open or fails to close.
- 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.
Code P0442 1999 Ford F150 Description
- Large and small leaks
- Excess vacuum
- Purge flow during non-commanded conditions
- Fuel Level and Fuel Pressure sensor faults
- EVAP Purge and Vent Valve faults
The ECM monitors the Fuel Tank Pressure sensor in order to determine the level of vacuum/pressure in the EVAP system. The ECM commands both the EVAP Purge Solenoid and the EVAP Vent Valve ON when the conditions are met in order to apply an engine vacuum to the EVAP system. The ECM commands the EVAP Purge Solenoid OFF once the system has reached a predetermined level of vacuum. This test verifies if a vacuum can be achieved in the EVAP system. Failure to develop a vacuum may be caused by a large leak or a restriction.
The Diagnostic Trouble Code (DTC) will set when a malfunction is detected when the EVAP control system has a leak, the EVAP control system does not operate properly.
What are the Possible Causes of the DTC P0442 1999 Ford F150?
- Missing or loose fuel cap
- Incorrect fuel filler cap used
- Fuel filler cap remains open or fails to close
- Foreign matter caught in fuel filler cap
- EVAP canister or fuel tank leaks
- EVAP system hose leaking
- Fuel tank leaking
How to Fix the DTC P0442 1999 Ford F150?
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.
Code Tech Notes
The PCM monitors the complete EVAP control system for the presence of a small fuel vapor leak. The system failure occurs when a fuel vapor leak from an opening as small as 1.016 mm (0.04 inch) is detected by the EVAP running loss monitor test.
There is a factory service bulletin for the 1999 Ford F-150:
1999 Ford F-150 Factory Service Bulletin OBDII Code P0442
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P0442 1999 Ford F150 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 P0442 1999 Ford F150 code?
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Frequently Asked Questions about P0442 1999 Ford F150 Code
1. What are common symptoms of OBDII code P0442 on a 1999 Ford F150?
- Common symptoms include the check engine light illuminating, a slight fuel odor, and potential difficulty starting the vehicle.
2. What are the possible causes of OBDII code P0442 in a 1999 Ford F150?
- The code P0442 typically indicates a small leak in the evaporative emission control system, which can be caused by a loose or damaged gas cap, a cracked or disconnected hose, or a faulty purge valve.
3. How can I diagnose the cause of OBDII code P0442 on my 1999 Ford F150?
- To diagnose the issue, you can start by checking the gas cap to ensure it is tight and in good condition. Inspect the hoses in the evaporative emission system for any cracks or disconnections. You may also need to perform a smoke test to pinpoint the exact location of the leak.
4. Can I continue driving my 1999 Ford F150 with OBDII code P0442?
- It is generally safe to drive the vehicle with code P0442, but it is recommended to address the issue promptly to prevent potential damage to the emission control system and ensure the vehicle passes emissions tests.
5. How can I repair OBDII code P0442 on my 1999 Ford F150?
- Repairing code P0442 may involve tightening or replacing the gas cap, repairing or replacing damaged hoses, or replacing a faulty purge valve. It is essential to fix the underlying issue causing the small leak in the evaporative emission system.
6. Will resetting the OBDII code P0442 on my 1999 Ford F150 make it go away permanently?
- Resetting the code may temporarily turn off the check engine light, but if the underlying issue causing the small leak is not addressed, the code is likely to reappear. It is crucial to diagnose and fix the problem to prevent recurring issues.
7. Can a DIY enthusiast fix OBDII code P0442 on a 1999 Ford F150?
- Depending on your skill level and access to tools, DIY enthusiasts can often address code P0442 by checking and tightening the gas cap, inspecting hoses for damage, and replacing components like the purge valve if needed.
8. How much does it typically cost to repair OBDII code P0442 on a 1999 Ford F150 at a mechanic?
- The cost of repairing code P0442 can vary depending on the exact cause of the small leak in the evaporative emission system. Repairs may range from a simple gas cap replacement (around $20) to more extensive repairs involving hoses or valves (potentially several hundred dollars).
9. Are there any maintenance tips to prevent OBDII code P0442 from appearing on my 1999 Ford F150?
- Regularly checking and tightening the gas cap, inspecting hoses for damage, and ensuring the evaporative emission system components are in good condition can help prevent code P0442 from occurring. Additionally, following the manufacturer's recommended maintenance schedule is essential.
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