The basic diagnostic code P0202 OBD II indicates that the PCM (Powertrain Control Module) has detected a fault in injector number 2 or even in one of its cables or connectors.
The Powertrain Control Module (PCM) inspects the injector and when the injector is activated the PCM observes the voltage, which must be low, i.e. close to zero.
When the injector is turned off, the PCM expects to see a voltage approaching the battery voltage, i.e. high.
If the expected voltage is not met, the PCM sets the DTC code P0202. Similarly, this code is due to the circuit resistance being too low or too high.