Check Engine Light Series: Article #1
Your car’s “Check Engine” or “Service Engine Soon” light can flash on for more than 1,400 different reasons. 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. 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.Here’s an example of a problem that can trigger the light…
Trouble Code: P0456 Evaporative Emissions System – Small Leak Detected
The EVAP system is a closed system that captures fuel tank vapors and prevents them from escaping into the atmosphere. 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. Everything will seem fine, except for the glowing check engine light on the dashboard.
Here Are Some Possible Causes For An EVAP Code Or An EVAP Leak:
- Missing or loose fuel cap.
- Incorrect fuel cap used.
- Evaporative (evap) emission canister or fuel tank leaks.
- Evaporative (evap) emission system hose leaking.
- Fuel tank leaking.
- A small leak in any of the EVAP hoses or fuel tank hoses.
- A small leak in the purge valve or vent valve.
What To Do If Your ‘Check Engine’ Light Comes On:
First, confirm it’s the ‘Service Engine’ or ‘Check Engine’ light. If you’re not sure, consult your owner’s manual. If it is the engine light, you won’t know whether it’s because of an EVAP failure or something else (unless you try to go through the emissions test lane or stop by an auto parts store that will retrieve the diagnostic trouble code or codes). But what you can do first is see if the gas cap is to blame. Check the gas cap to make sure it’s tight and there’s no rust or anything else preventing it from sealing.
Courtesy of autolablibertyville
