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The evap system itself features several key components, including the evap (charcoal) canister, fuel tank, fuel tank vent, and evap purge solenoid A faulty gas cap (loose, cracked, or with a worn rubber seal) breaks this loop, allowing vapor to escape and causing the car’s computer to detect a large leak (p0455). What is an evap system
The evaporative emission (evap) control system prevents gasoline vapors from escaping into the atmosphere The evap system is sealed. The system contains a small charcoal canister that absorbs and stores fuel tank vapors
A purge valve at the top of the canister opens when the engine vacuum causes its internal pressure to exceed atmospheric pressure
This process allows stored vapors to be drawn. If you have an evap leak, symptoms like a check engine light for an evap leak code, like p0442 or p0455, or other signs like a cracked charcoal canister will appear Discover what an evap system leak is, how to identify its symptoms, common causes, and the steps to fix it Learn how this critical system keeps your car running clean and efficient.
P0442 evap system leak detected (small leak) Causes, symptoms, diagnostic the purpose of the evap system is to prevent fuel vapors inside the fuel tank from releasing in to the atmosphere Read how the evap system works below
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