Faulty fuel injector 1
Fuel Injector 1 harness is open or shorted
Fuel injector 1 circuit poor electrical connection
Engine Light ON (or Service Engine Soon Warning Light)
Lack/Loss of Power
The engine may be harder to start
Engine Control Module (ECM) checks the injectors circuit resistance and monitors the voltage drop during normal operation. The ECM will trigger the P0201 code when the resistance or voltage drop at the injector 1 is out of specifications.