Spn 3364 Fmi 10 - The Rock Without Prosthetic Foreheadfav Page Create I am a bit lost with the discrepancy between the displayed message (low def level) and the engine fault code spn 3364 fmi 10 oc 2 (which is for poor def quality). Fault code 4277 indicates a problem with the aftertreatment diesel exhaust fluid quality sensor. The sensor measures the def concentration and communicates with the ecm. This diagnostic is typically improper diesel exhaust fluid (def) quality warning. Connect dddl/ddrs 7. 04 sp5 or higher.
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