Troubleshooting the spn 1209 fmi 2 cummins fault
If you're seeing the spn 1209 fmi 2 cummins code pop up on your diagnostic tool or dashboard, you're likely dealing with a sensor that has decided to stop playing nice with the rest of the engine. It's a frustrating situation because, unlike a "dead" sensor that just quits entirely, an FMI 2 code means the data is "erratic" or "intermittent." Basically, your Exhaust Gas Pressure (EGP) sensor is telling the ECM something that just doesn't make sense, and the ECM isn't buying it. ...