Ever had that dreaded check engine light pop up out of nowhere, and your scanner throws a mysterious code at you The code p0442 indicates that the engine computer (pcm) has detected a small leak in the evap system. How to fix p0456 now that you’ve found the exact point of the leak, it’s time to replace or repair your evaporative emissions system
Don’t pressurize your system with air while you’re checking for a leak, as this could damage your vent solenoid and purge valve As you drive and conditions allow, the engine computer (pcm) tests the evap system for leaks by monitoring pressure or vacuum inside the system Instead, remove the smoke machine and inspect the area of the leak.
[1] while you’re driving, your engine control module (ecm) performs specific tests to ensure your evap system is holding the correct amount of vacuum pressure. The cost to repair an evap system leak ranges from a few dollars for a loose gas cap and up to $800 for more complex issues like a damaged charcoal canister What’s an evap system leak? Learn how to identify and repair an evap system leak in your vehicle
