P1147 NISSAN Possible Causes
- Faulty Heated Oxygen Sensor (O2) 2 (rear)
- Air intake leaks
- Heated Oxygen Sensor (O2) 2 (rear) wiring is open or shorted
- Poor electrical connection in the Heated Oxygen Sensor (O2) 2 (rear) circuit
- Inadequate fuel pressure
- Faulty fuel injectors
How to Repair P1147 NISSAN Code?
Start by checking the “possible causes” listed above. Visually inspect the corresponding wiring and connectors. Look for damaged components and check for broken, bent, pushed out, or corroded connector pins.
Technical Notes
Replacing the O2 sensor 2 usually resolves the issue
When is the Code Detected?
The P1147 code is triggered when the sensor’s maximum voltage is not reached at the specified voltage.
Possible Symptoms
- Check engine light on (or engine warning light about to activate)
- Possible high fuel consumption
- Possible excessive smoke from exhaust gases
P1147 NISSAN Meaning
The Heated Oxygen Sensor 2 (HO2S) (rear O2 sensor), located after the three-way catalyst (manifold), monitors the oxygen level in the exhaust gases in each bank. For optimal catalyst operation, the air-fuel mixture (air-fuel ratio) must be maintained near the ideal stoichiometric ratio. The HO2S output voltage changes abruptly near the stoichiometric ratio. The Engine Control Module (ECM) adjusts the fuel injection time so that the air-fuel ratio is nearly stoichiometric. The HO2S generates a voltage between 0.1 and 0.9 V in response to the oxygen in the exhaust gases. If the oxygen in the exhaust gases increases, the air-fuel ratio becomes lean. The ECM interprets a lean mixture when the HO2S voltage is below 0.45 V. If the oxygen in the exhaust gases decreases, the air-fuel ratio becomes rich. The ECM interprets a rich mixture when the HO2S voltage is above 0.45 V.