Check engine light after using Sea Foam Spray in a Ford F 150 [SOLVED]

Thanks for the question James. Using Sea Foam Spray through the upper intake can cause misfire codes during application. It’s just your engine computer noticing something irregular going on in the chambers and doing its job. The codes will typically reset to normal within 20 or so miles of driving (after the application). No worries, anyway.

I just had a cleaning done using Sea Foam and I have a check engine light for mass air flow and O2 sensors; the misfire you explained, but what of the sensors?

Good question, Grayson. Try clearing the code and see if it comes back. If your vehicle is higher-mileage and you get an O2 sensor code that won’t clear (comes back after clearing)… it’s likely that the O2 sensor is at the end of it’s useful life/needs replacement. We’re always here to help troubleshoot, so don’t hesitate to send us a message through the “Ask Jim” page under “Contact Us.” Hope this helps!

I sprayed Sea Foam Spray into my throttle body as directed. I did everything and now I got a service engine light on. What could it be? Could you help me please?

Hey Dan,

Applying Sea Foam Spray through the intake can cause a misfire code during the treatment. Understand that you’re adding something unusual to the upper engine’s fuel and air mix during the cleaning application, so it might take up to 20 post-treatment driving miles for your engine’s sensors to re-adjust to normal. If the check engine light (CEL) remains, you can disconnect the negative cranking battery connection for a few seconds to clear the CEL.