If you’re not sure, consult your owner’s manual. What to Do if Your ‘Check Engine’ Light Comes On:įirst, confirm it’s the ‘Service Engine’ or ‘Check Engine’ light. A small leak in the purge valve or vent valve. ![]() A small leak in any of the EVAP hoses or fuel tank hoses.Evaporative (evap) emission system hose leaking.Evaporative (evap) emission canister or fuel tank leaks. ![]() Here are Some Possible Causes for an EVAP Code or an EVAP Leak: Everything will seem fine, except for the glowing check engine light on the dashboard. When your engine light comes on because of a weakness or failure in this system, you most likely won’t notice the car driving any differently. The EVAP system is a closed system that captures fuel tank vapors and prevents them from escaping into the atmosphere. Here’s an example of a problem that can trigger the light… Trouble Code: P0456 Evaporative Emissions System – Small Leak Detected The purpose of the OBD system is to reduce tailpipe emissions, and your car is programmed to alert you any time the engine control computer detects that a sensor or system isn’t performing the way it’s supposed to. ![]() The light is part of your vehicle’s on-board diagnostics (OBD) system and can indicate anything from a quick fix like a loose gas cap to a major repair like a failing catalytic converter. Your car’s “Check Engine” or “Service Engine Soon” light can flash on for more than 1,400 different reasons.
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