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Codes, but no check engine light
I recently purchases a 2003 F350 w/6.0L w 101k. All in all, truck is in fantastic shape. Everything seems to have been maintained well. I connected my new Edge Evolution programmer last night and up popped the following 6 codes
P0279 - Injector #7 Circuit Low
P0281 - Cylinder #7 Contribution/Balance
P0336 - Crankshaft Position Sensor A circuit range/performance
P0341 - Camshaft Position Sensor A circuit range/performance
P0528 - Fan Speed sensor circuit no signal
P2290 - Injector Control Pressure Too Low
My question is "why" wasn't the check engine light on?
Do I have some serious issues or are these par for the course of a truck this age/miles.
One thing to note, when I was hooking up the Evolution, I noticed that the previous owner MAY have had an Edge product because it already had the EGT probe installed into the manifold and there are 4 wires hanging loose from the large wiring harness in the upper right of the engine compartment (red, black, blue and yellow). So it appears that the previous owner/dealer may have removed the component before and cut those wires. Could this have tripped the codes? I have NOT cleared anything...deciding what my next steps should be.
Thanks for the help in advance!
2003 F350 6.0L PS
Crew Cab, 4x4, Long Bed DRW