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Question:

check engine light p0456 gas type?

I just got this check engine light. I‘m pretty sure my car is well kept.I need to change the spark plugs sometime, according to the maintenance schedule.The only thing I have done different is put in 0% ethanol fuel (no added ethanol) in the vehicle (which I thought was great at the time!). Now, the gas has done pretty well (xD!), but this engine light is on.I read the code and it is p0456, which is associated with emissions. So something between the gas tank and the engine is leaking.Could it be the fuel? Should I just wait and see next time I load up on ethanol % (boooo!) fuel? Should I just change the gas cap and see? Thanks for the help.

Answer:

99% of the time, that code is caused by the gas cap either not being tight, or the rubber seal on the gas cap leaking. Make sure the gas cap is tight; take it off, check the rubber seal ring, and put the cap back on, making sure it clicks when you tighten it. If your engine light doesn't reset, go to an auto parts store and get a new gas cap, they're cheap. For what it's worth, the fuel wouldn't have anything to do with that code, but 0% ethanol fuel will give you a slight boost in fuel economy, and is better for your car because ethanol can dry out rubber hoses and seals, and ethanol can bond with water while it sits in the gas station storage tanks, leading to increased corrosion in your car's fuel system.
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Most times a gas cap does fix those codes. I only replace with dealer caps because aftermarket ones can cause problems. Here in the northeast the 2nd most common cause is rotted out fuel filler necks. 3rd are evaporative vent solenoids. They vent fumes into the atmosphere when needed.
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