Can I add Sea Foam to a full tank with a check engine light? [SOLVED]

My 09 Challenger check engine light came on and it has very low mileage and a full tank of gas (with ethanol in my state) that is a couple months old. Can I add Sea Foam to the full tank of gas to see if it resolves my problem or do I need to drain the tank and put Sea Foam in first?

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Jim D.
3 months ago

Hi Amy,

Before adding Sea Foam, I’d recommend having someone read the code to help figure out what the problem is. Most auto parts stores will read the code for free. Just ask at the counter for some help with a check engine light. From there, you can figure out if Sea Foam might help the problem.

For adding Sea Foam to the gas tank, here’s what I’d recommend to anyone: wait until you have a low tank of fuel (1/8 to 1/4 tank). Add a full 16 oz can of Sea Foam Motor Treatment or High Mileage, and then drive it until almost empty before refueling. That way you run a high concentration of Sea Foam through the fuel system and engine, which does a great job of cleaning.

Hope that helps!