Hello Guys, First post here. I've been doing some reading here and found some excellant answers to some interesting situations. So I thought I would ask for some advise. I have a 2006 f 150 5.4 Changed out all spark plugs, Never had a CEL since new. I dis-connected the Battery, Removed the PCM (clearance problem)replaced the plugs, (of course broke 1) replaced PCM, hooked up battery. Truck runs smooth as can be. CEL is now on steady. Could this have happened because of PCM removal ? Heard about flashing PCM? Or should i bring it to Auto zone for code reading? Thanks in advance for any help here.

 

Update!! I had removed the Neg. cable from batt. Turned on the headlights for 30 mins to clear the CEL. (This did turn off the CEL.) During this time I changed the oil and filter due to using the carbon remover for the plug change. Didn't want to have too much trash in the oil. Also changed out the fuel filter. I drove the truck for 75 miles under highway conditions. The engine performed great. Just a slight increase in fuel consumption due to the factory settings on the PCM. I'm sure that will increase over time. Just enjoying the rest of the day..