Advanced Diagnostics

DTC P2247 (156) Advanced Diagnostics

DTC P2247:

Front Air/Fuel Ratio (A/F) Sensor (Bank 2, Sensor 1) VCENT Circuit High Voltage





General Description

The front air/fuel ratio (A/F) sensor (bank 2, sensor 1) is installed in the exhaust manifold and detects oxygen content in the exhaust gas. The front A/F sensor (bank 2, sensor 1) transmits output voltage to the powertrain control module (PCM), and it enables overall feedback control. The PCM controls fuel injection duration by comparing the target air/fuel ratio with the front A/F sensor (bank 2, sensor 1) signal. If the VSB2 terminal voltage is a specified value for a set time, the PCM detects a malfunction and stores a DTC.

Monitor Execution, Sequence, Duration, DTC Type, OBD Status





Enable Conditions





Malfunction Threshold

The VSB1 terminal voltage is 5.3 V or less for at least 5 seconds*, 38 seconds**.

Driving Pattern

Start the engine. Hold the engine speed at 3,000 rpm without load (in P or N) until the radiator fan comes on, then let it idle for 2 minutes.

Diagnosis Details

Conditions for setting the DTC

When a malfunction is detected during the first drive cycle, a Pending DTC is stored in the PCM memory. If the malfunction returns in the next (second) drive cycle, the MIL comes on and the Confirmed DTC and the freeze data are stored.

Conditions for clearing the DTC

The MIL is cleared if the malfunction does not return in three consecutive trips in which the diagnostic runs. The MIL, the Pending DTC, the Confirmed DTC, and the freeze data can be cleared with the scan tool Clear command or by disconnecting the battery.