P1147 INFINITI – Heated Oxygen Sensor 2 Maximum Voltage Monitoring, Bank 1

P1147 INFINITI Possible Causes

  • Faulty Heated Oxygen Sensor (O2) 2 (rear)
  • Intake air leaks
  • Heated Oxygen Sensor (O2) 2 (rear) harness is open or shorted
  • Poor electrical connection in Heated Oxygen Sensor (O2) 2 (rear) circuit
  • Inappropriate fuel pressure
  • Faulty fuel injectors

How to Fix Code P1147 INFINITI?

Start by checking the “possible causes” listed above. Visually inspect the corresponding wiring harness 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

  • Engine light on (or service engine soon warning light)
  • Possible high fuel consumption
  • Possible excessive smoke from exhaust

P1147 INFINITI 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 on each bank. For optimal catalyst operation, the air-fuel mixture (air-fuel ratio) must be maintained close to 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 Lean 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 Rich when the HO2S voltage is above 0.45 V.

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P1147 NISSAN – Heated Oxygen Sensor 2 Maximum Voltage Monitoring, Bank 1

P1147 NISSAN Possible Causes

  • Faulty Heated Oxygen Sensor (O2) 2 (rear)
  • Intake air leaks
  • Heated Oxygen Sensor (O2) 2 (rear) harness is open or shorted
  • Poor electrical connection in Heated Oxygen Sensor (O2) 2 (rear) circuit
  • Inappropriate fuel pressure
  • Faulty fuel injectors

How to Fix Code P1147 NISSAN?

Start by checking the “possible causes” listed above. Visually inspect the corresponding wiring harness 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

  • Engine light on (or service engine soon warning light)
  • Possible high fuel consumption
  • Possible excessive smoke from exhaust

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 on each bank. For optimal catalyst operation, the air-fuel mixture (air-fuel ratio) must be maintained close to 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 oxygen in the exhaust gases. If oxygen in the exhaust increases, the air-fuel ratio becomes lean. The ECM interprets Lean when the HO2S voltage is below 0.45 V. If oxygen in the exhaust decreases, the air-fuel ratio becomes rich. The ECM interprets Rich when the HO2S voltage is above 0.45 V.

P1147 VOLKSWAGEN – HO2S21 System Too Lean

P1147 VOLKSWAGEN Possible Causes

  • Faulty HO2S21
  • HO2S21 harness is open or shorted
  • Poor electrical connection in HO2S21 circuit
 

How to Fix P1147 VOLKSWAGEN Code?

Start by checking the “possible causes” listed above. Visually inspect the corresponding wiring harness and connectors. Look for damaged components and check for broken, bent, pushed out, or corroded connector pins.

 
 

Possible Symptoms

  • Engine light on (or service engine soon warning light)
 

P1147 VOLKSWAGEN Meaning

HO2S21 System Too Lean is the generic description for Volkswagen P1147 code, but the manufacturer may have a different description for your vehicle model and year. Currently, we have no further information about Volkswagen P1147 OBDII code.

P1148 – Closed Loop Control Functions 1

P1148 Possible Causes

  • Faulty Heated Oxygen Sensor 1, Bank 1
  • Open or short circuit in Heated Oxygen Sensor 1, Bank 1 circuit
  • Electrical connection of Heated Oxygen Sensor 1, Bank 1 circuit

How to Fix Code P1148?

Start by checking the “possible causes” listed above. Visually inspect the corresponding wiring harness and connectors. Look for damaged components and check for broken, bent, pushed out, or corroded connector pins.

Possible Symptoms

  • Engine light on (or engine service warning light soon)

P1148 Meaning

The Engine Control Module (ECM) performs an ON/OFF operation check of the Air/Fuel (A/F) ratio heater / corresponding Heated Oxygen Sensor 1 according to the engine operating condition to maintain the Air/Fuel (A/F) ratio / Heated Oxygen Sensor 1 element temperature within the specified range.

P1148 NISSAN ALTIMA – Closed Loop Control Function Bank 1

P1148 2002 NISSAN ALTIMA SEDAN Possible Causes

  • Faulty Heated Oxygen Sensor 1, Bank 1
  • Open or Short Circuit in Heated Oxygen Sensor 1, Bank 1 Circuit
  • Electrical Connection of Heated Oxygen Sensor 1, Bank 1 Circuit

How to Fix Code P1148 2002 NISSAN ALTIMA SEDAN?

Start by checking the “possible causes” listed above. Visually inspect the corresponding wiring harness and connectors. Look for damaged components and check for broken, bent, pushed out, or corroded connector pins.

When is the Code Detected?

The closed-loop control function for Bank 1 does not operate even when the vehicle is running under specified conditions; the closed-loop control function for Bank 2 does not operate even when the vehicle is running under specified conditions.

Possible Symptoms

  • Check Engine Light On (or Service Engine Soon Warning Light)

P1148 2002 NISSAN ALTIMA SEDAN Meaning

The Engine Control Module (ECM) performs an ON/OFF operation control of the heater for Heated Oxygen Sensor 1 according to the engine operating condition to maintain the temperature of the Heated Oxygen Sensor 1 element within the specified range.

P1148 INFINITI G35 – Closed loop control function, bank 1

P1148 2003 INFINITI G35 Possible Causes

  • Faulty Heated Oxygen Sensor 1, Bank 1
  • Open or short circuit in Heated Oxygen Sensor 1, Bank 1 circuit
  • Electrical connection of Heated Oxygen Sensor 1, Bank 1 circuit

How to Fix Code P1148 2003 INFINITI G35?

Start by checking the “possible causes” listed above. Visually inspect the corresponding wiring harness and connectors. Look for damaged components and check for broken, bent, pushed out, or corroded connector pins.

When is the Code Detected?

The closed-loop control function for Bank 1 does not operate even when the vehicle is running under specified conditions, the closed-loop control function for Bank 2 does not operate even when the vehicle is running under specified conditions.

Possible Symptoms

  • Engine Light On (or Service Engine Soon Warning Light)

P1148 2003 INFINITI G35 Meaning

The Engine Control Module (ECM) performs an ON/OFF operation control of the corresponding Heated Oxygen Sensor 1 heater according to the engine operating condition to maintain the Heated Oxygen Sensor 1 element temperature within the specified range.

P1148 NISSAN – Bank 1 Closed Loop Control Function

P1148 2007 NISSAN SENTRA Possible Causes

  • Faulty Air Fuel Ratio Sensor 1, Bank 1
  • Air Fuel Ratio Sensor 1 Bank 1 Circuit Open or Shorted
  • Electrical connection in Air Fuel Ratio Sensor 1 Bank 1 circuit

How to Fix Code P1148 2007 NISSAN SENTRA?

Start by checking the “Possible Causes” listed above. Visually inspect the corresponding wiring harness and connectors. Look for damaged components and check for broken, bent, pushed out, or corroded connector pins.

When is the Code Detected?

The closed-loop control function for Bank 1 does not operate even when the vehicle is running under specified conditions, the closed-loop control function for Bank 2 does not operate even when the vehicle is running under specified conditions.

Possible Symptoms

  • Engine Light On (or Service Engine Soon Warning Light)

P1148 2007 NISSAN SENTRA Meaning

The Engine Control Module (ECM) performs on/off control of the air-fuel ratio (A/F) sensor heater corresponding to the engine operating condition to maintain the air-fuel ratio (A/F) sensor element temperature within the specified range.

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P1148 AUDI – HO2S21 System Too Rich

P1148 AUDI Possible Causes

  • Faulty HO2S21
  • Mass Air Flow (MAF) sensor
  • HO2S21 harness open or shorted
  • Poor electrical connection in HO2S21 circuit

How to fix P1148 AUDI code?

Start by checking the “possible causes” listed above. Visually inspect the corresponding wiring harness and connectors. Look for damaged components and check for broken, bent, pushed out, or corroded connector pins.

Possible Symptoms

  • Engine light on (or service engine soon warning light)

P1148 AUDI Meaning

HO2S21 System Too Rich is the generic description for Audi P1148 code, but the manufacturer may have a different description for your vehicle model and year. Currently, we don’t have more information about the Audi P1148 OBDII code.