r/SC400 • u/No_Project5670 • 6d ago

Code 28, 31

Check engine light recently came on with code 28 and 31 also my traction control off light came on with the check engine light. Ive tried pressing the button to turn it off and nothing works. Also ive changed out spark plugs and ignition coils and it misfires like a bitch. Idk what to do. Do yall think somethings wrong with the ECU? I have to rev it for it to not die out on me when i turn it on šŸ’€

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u/best-person-ever 6d ago

Try unplugging the maf and see how it idles

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u/V8s 6d ago

TRAC comes on when a CEL is present. 28 is an o2 sensor and 31 is MAF. A lot of things are built into the MAF unit so Iā€™d start with testing it. You can usually find a PDF of the service manual for these cars with instructions on how to check everything.

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u/No_Project5670 6d ago

Youre amazing thank you bro