Why is my “check engine” light on after using Sea Foam Spray? [SOLVED]

I have a 2010 Dodge Ram 1500 with HEMI 5.7 engine. I used the Sea Foam spray using the procedure described on the package, and now my ´check engine light´ is on. What should I do?

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Jim D.
Jim D.
2 years ago

Thanks for the question Hernan. 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 Dodge’s engine 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. Hope this helps!

Zachary Petree
Zachary Petree
1 year ago

I never got smoke. Now my engine light is on. The only smoke I got was when I revd high down the road. For 1 second. That’s it. Now engine light.

Brian Miller
Admin
1 year ago
Reply to  Zachary Petree

3 things to consider: 1) Smoke means nothing. 2) Your check engine light is probably a misfire code that will correct once you go back to normal engine operation. 3) Have the code checked to determine the cause. If a misfire code, just cancel it out. Nothing to worry about. Hope this helps!

Will
Will
1 year ago

I used the Sea Foam intake spray as directed and after approximately 80 kms the check engine light came on. It’s showing code P0420 which is a catalytic converter below threshold. Cleared the code once and it came back after another 80kms. What is my fix here?

Brian Miller
Admin
1 year ago
Reply to  Will

Hi Will. A catalytic converter issue would not be related to using Sea Foam Spray. [And we agree that the cause/effect is reasonable.] Was the P0420 paired with another code? What’s the odometer reading?

Will Goehner
Will Goehner
1 year ago

Hey Brian, thanks for getting back to me. The first time the check engine light came on it was paired with a rich fuel code. Which makes sense with the Sea Foam. After clearing the initial two codes only the P0420 came back. Could the catalytic converter be getting clogged with everything the the Sea Foam knocked out of the top end of the engine?

Brian Miller
Admin
1 year ago
Reply to  Will Goehner

No, catalytic converter issues are typically related to too much heat, misfires, or leaks.

Paul
Paul
1 year ago

I have a 2004 2.3 Ranger. Same thing happened to me. Tried battery disconnect. Check engine light is still on. Could Sea Foam Spray have fouled the O2 sensor?

Conner Kranz
Admin
Conner Kranz
1 year ago
Reply to  Paul

Hi Paul,

Sea Foam Spray would not have fouled the O2 sensor. Do you know the specific check engine code? (Most parts stores will read them for free).

Let us know what you find and go from there!

Abi T
Abi T
11 months ago

Hey guys. I have the same issue as well since adding a full spray can into the throttle body (followed instructions). Sea Foam worked great on my past cars. This car shows a P1157 code which is the primary 02 sensor indicating lean. I also cleared the code but the light came back on. I’m not sure if I have to replace it since I’ve been driving it for about 70-80 kms now and CEL is still on. No other codes. Any help would be greatly appreciated.

Brian Miller
Admin
11 months ago
Reply to  Abi T

Hi Abi. If your vehicle has over 125,000 odometer miles 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. Hope this helps!

Michelle Dahlman
Michelle Dahlman
9 months ago

I put seafoam in trying to pass smog my check engine light came on do u keep driving it out of car. It happe6to my last car finally went off

Conner Kranz
Admin
Conner Kranz
9 months ago

Hi Michelle,

Yes, clear the code and keep driving. Should resolve itself. If the check engine light remains, disconnect the negative cranking battery connection for a few seconds to clear the check engine light.

Hope that helps!

Dana
Dana
4 months ago

Had cylinder #2 misfire so changed spark plugs an cleared code. Than same code came back so I added Sea Foam. Cleared code. Now code came back for cylinder head over temperature. I changed the CHT sensor but same code… What should I do next?

Brian Miller
Admin
4 months ago
Reply to  Dana

HI Dana. Have you considered ignition coil/wiring replacement? Any idea what’s causing the cylinder to overheat?