Rick's Free Auto Repair Advice

Posts Tagged: P0442

P0442 Ford

Fix a P0442 leak and P0442 code comes back If your Ford shows a P0442 Evaporative Emission Control System Leak Detected (small leak), you should know that Ford has had some problems with the capless flap in the gas tank filler neck. If installing a new one doesn’t fix the P0442 problem, continue to test the vent and purge solenoid valves, as well as the fuel tank pressure sensor (FTP). The FTP should show 2.6-volts while the EVAP system is open and then drop to 1.0-volt or less when the … Read More

Diagnose P0442 or P0456

Diagnose P0442  or P0456 Test for P0456 Evaporative Emissions System – Small leak detected or P0442 Evaporative Emission Control System Leak Detected (small leak) These codes indicate that the Evaporative Emissions System has failed a leak test. For more information on what the EVAP system is and how it works, see this article. To perform the test the computer energizes the vacuum management valve (VMV) vent valve that opens the fuel system to fresh air. Then it opens the VMV purge valve that opens the system to engine vacuum. The … Read More

P0442 code and P0455 P0456 Fixes on a Ford vehicle

Learn how to fix P0442 code and P0455 P0456 on Ford Vehicles A P0442 code is defined as: Evaporative System Malfunction, Small Leak.  A P0455 is: EVAP large leak detected. A P0456 is: Evaporative Emissions System – Small Leak Detected. Understanding how the evaporative emissions system works helps you to diagnose those dreaded EVAP leak codes. So buckle up and I’ll try to make this as painless as possible. Most common causes of aP0442 code and P0455 P0456 • Capless fuel tank filler — If your Ford is equipped with … Read More


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