P1147 INFINITI - Heated Oxygen Sensor 2 Maximum Voltage Monitoring Bank 1
P1147 INFINITI Possible Causes
- Faulty heated oxygen (O2) sensor 2 (rear)
- Intake air leaks
- Heated oxygen (O2) sensor 2 (rear) harness is open or shorted
- Heated oxygen (O2) sensor 2 (rear) circuit poor electrical connection
- Inappropriate fuel pressure
- Faulty fuel injectors
First diagnose P1147 INFINITI code
Check the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector's pins.
P1147 INFINITI Tech NotesReplacing the O2 Sensor 2 usually takes care of the problem
Cost of diagnosing the P1147 INFINITI code
Labor: 1.0The cost of diagnosing the P1147 INFINITI code is 1.0 hour of labor. The auto repair labor rates vary by location, your vehicle's make and model, and even your engine type. Most auto repairs shops charge between $75 and $150 per hour.
When is the P1147 INFINITI code detected?The P1147 code is triggered when the maximum voltage from the sensor is not reached to the specified voltage.
P1147 INFINITI Possible Symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
- Possible high fuel consumption
- Possible excessive smoke from exhaust
P1147 Infiniti DescriptionThe Heated Oxygen Sensor 2 (HO2S) (Rear O2 Sensor), after three way catalyst (manifold), monitors the oxygen level in the exhaust gas on each bank. For optimum catalyst operation, the air fuel mixture (air-fuel ratio) must be maintained near the ideal stoichiometric ratio. The HO2S output voltage changes suddenly in the vicinity of 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 oxygen in the exhaust gas. If the oxygen in the exhaust gas increases, the air-fuel ratio becomes Lean. The ECM interprets Lean when the HO2S voltage is below 0.45 V. If the oxygen in the exhaust gas decreases, the air-fuel ratio becomes Rich. The ECM interprets Rich when the HO2S voltage is above 0.45 V.
P1147 INFINITI More InformationNeed more information on how to fix the P1147 INFINITI code?
Get Access to Factory Service Manuals
P1147 Infiniti Information for specific Infiniti models
Need more help?Get the P1147 Infiniti code diagnosed by a professional: Find a repair shop in your area
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