I have an 11 ram 2500with miss fire issues

Question

I changed all 16 plugs coil pack and injector on misfiring cylinder Throttle position sensor cam and crank sensor.  Still getting code for random misfire and #3. Add that I'm getting a po209/, for an o2 sensor now.    I'm at whits end supposed to leave on Vaca this morning.  Any help would be greatly appreciated

Answer 1

P0209 would for a injector problem on the number 9 cylinder but you only have 8 injectors, If you already changed out the offending cylinder with the misfire fuel injector, you might just be looking into a failed fuel injector driver in the ECM. What is always seen in this type of injector code is a failed injector connection to the fuel injector,

​ Check the fuel injector connection it should lock into place and not easily separate, Here this fuel injector failed to lock properly in its place this set a misfire condition as well as a injector code, the fix use zip ties to secure in place,