Unlike some other vehicle problems, a leaky EVAP system may not cause your vehicle to run poorly. Again, this code tells you your EVAP leak is small. Because noticing a leak without computer assistance can be challenging, the OBD-II scanner alerts you to a leak by generating a P0442 DTC. If your EVAP system springs one, fuel vapors may seep out before your vehicle’s engine can incinerate them. What does the code P0442 mean? As with any system of hoses, valves, and vacuums, leaks are the enemy. Then, an intake vacuum sucks fuel vapors into the engine where they burn off, decreasing overall emissions. To do so, a purge control valve must open. Modern vehicles have a way to minimize emissions. Whether a simple or advanced approach takes care of your DTC, finding the source of the code is essential both for ensuring your vehicle’s emissions stay within normal parameters and turning off your check engine light. If that fails, you may need to perform a smoke test to find the EVAP system leak. If either of these are defective, replacing the bad part with an OEM component may fix the problem. The scan tool locates leaks that are either hidden or imperceptible to the naked eye.Īlternatively, check the functionality of the EVAP purge valve and solenoid. If that is the case, use an advanced scan tool to perform an EVAP leak test. Potential Advanced ResolutionsĪs you may suspect, sometimes tinkering with the fuel cap and visually inspecting the EVAP system may not resolve your OBD-II scanner error code P0442 problem.
If you see any, replace the damaged component. If tightening or replacing your vehicle’s fuel cap does not resolve the code, visually inspect your EVAP system for tears, holes, or cracks in its tubes and hoses. To troubleshoot this, replace the cap using an OEM component. Of course, there is a chance your gas cap either has worn out or is not compatible with your EVAP system. If the code does not return, your gas cap probably was the culprit. Once you do, clear the code on the OBD-II scanner and drive for a few days. The simplest solution is to remove and reattach the gas cap. Fortunately, you may be able to resolve the issue without much effort.
#Toyota diagnostic code p0442 p how to#
Now that you understand the possible causes of this DTC, you need to know how to fix the problem. A different type of leak somewhere else in the EVAP system.