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DTC - Diagnostic Trouble Codes information

P1147

Powertrain Codes

P1147 - INFINITI - Heated Oxygen Sensor 2 (Rear) Maximum Voltage Monitoring (Bank 1)

Symptoms

- Engine Light ON (or Service Engine Soon Warning Light) - Possible high fuel consumption - Possible excessive smoke from exhaust

Possible Causes

- The O2 Sensor harness or connectors circuit is open or shorted - Heated oxygen sensor 2 - Fuel pressure - Injectors - Intake air leaks

When Detected

The P1147 code is triggered when the maximum voltage from the sensor is not reached to the specified voltage.

Tech Notes

O2 Sensor Examples:

Description

The heated oxygen sensor 2 (rear), after three way catalyst, monitors the oxygen level in the exhaust gas on each bank. Even if switching characteristics of the heated oxygen sensor 1 (front) are shifted, the air fuel ratio is controlled to stoichiometric, by the signal from the heated oxygen sensor 2. This sensor is made of ceramic zirconia. The zirconia generates voltage from approximately 1V in richer conditions to 0V in leaner conditions. Under normal conditions the heated oxygen sensor 2 is not used for engine control operation.