Possible causes

– Dirty Fuel Injector 6
– Faulty Fuel Injector 6
– Plugged Fuel Injector 6
– Fuel injector 6 harness is open or shorted
– Fuel injector 6 circuit poor electrical connection

Tech notes

Clogged or partially clogged fuel injector can cause this code. Start by performing an injector flush before replacing the injector.

Symptoms

– Engine Light ON (or Service Engine Soon Warning Light)
– Engine Misfire
– Engine Run Rough
– Low MPG

P0278 FORD Description

Code P0278 is triggered when the Engine Control Module (ECM) detects that the acceleration rate of the crankshaft for Cylinder 6 was less than a calibrated amount. During normal conditions the ECM turns the Fuel Injectors ON and OFF in the Fuel Injection System.