po603
I had the same 0603 code. The code appeared for approximately 6 months. I initially saw it during the cold winter months on first morning start. I could clear the code after the truck had been running for a few minutes and it would not appear for the rest of the day. At that time it would not throw a check engine light so Ford would do nothing about it. Well then spring came and I was still seeing the fault. I tried taking it to the dealership several times and they would do nothing about it because it did not keep the check engine light on. I took the truck on a long haul down to alabama. On the way there the truck tripped the check engine light indicating 0603, all 8 injectors low. I thought maybe my tuner was causing the problem so I removed it from the truck. Everything initially indicated okay. No CEL. I made it another 500 miles and the CEL came back on in South Carolina. The truck was down on power hesitating and jerking. I had to get home so I put the hammer down. I drove her that way all the way back. I took her to the dealership Monday morning. They had to replace the FICM, EGR cooler, rebuild the oil cooler, and of course change the oil. The truck lasted two weeks and then left me stranded right outside of my work. Bad EGR valve. I would not recommend just ignoring it.