P2243 - O2 SENSOR REFERENCE VOLTAGE CIRCUIT / OPEN BANK 1 SENSOR 1
POST UPDATED IN May, 2023
Description of DTC code P2243 Generic
Oxygen Sensor (O2) number 1 is found in the exhaust manifold. Its main function is to detect the total of oxygen in the exhaust gas compared to the outside air. The O2 sensors have a zirconium ceramic tube which generates approximately 1 volt in rich conditions and 0 volts in leaner conditions.
The Powertrain Control Module (PCM) receives the signal from the Oxygen Sensor, with which it adjusts the duration of the injection pulse, thus achieving the stoichiometric air/fuel ratio.
When the diagnostic code P2243 OBD2 is stored, it means that the PCM detected that the O2 Sensor 1 of bank 1 has an open circuit for the reference voltage.