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P1143 2003 Nissan Sentra Code - Heated Oxygen Sensor 1 Lean Shift Monitoring Bank 1

- Code Popularity: 2,518 Views
- Repair Importance Level: 3/3
- Repair Difficulty Level: 2/3
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What are the Possible Causes of the DTC P1143 2003 Nissan Sentra?

NOTE: The causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes.
  • Faulty Front Heated Oxygen Sensor Bank 1
  • Intake air leaks
  • Front Heated Oxygen Sensor Bank 1 harness is open or shorted
  • Front Heated Oxygen Sensor Bank 1 circuit poor electrical connection
  • Fuel pressure
  • Injectors
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How to Fix the DTC P1143 2003 Nissan Sentra?

Review the 'Possible Causes' mentioned above and visually examine the corresponding wiring harness and connectors. Ensure to check for any damaged components and inspect the connector pins for signs of being broken, bent, pushed out, or corroded.

Code Tech Notes

If there are no intake air leaks, the most likely cause of the P1143 code is the front O2 sensor bank 1.

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What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P1143 2003 Nissan Sentra code, it typically requires 1.0 hour of labor. The specific diagnosis time and labor rates at auto repair shops can differ based on factors such as the location, make and model of the vehicle, and even the engine type. It is common for most auto repair shops to charge between $75 and $150 per hour.

When is the Code Detected?

The maximum and minimum voltage from the sensor are not reached to the specified voltages.

What are Code Possible Symptoms?

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

Code P1143 2003 Nissan Sentra Description

The Heated Oxygen Sensor 1 is placed into the front tube. It detects the amount of oxygen in the exhaust gas compared to the outside air. The heated oxygen sensor 1 has a closed-end tube made of ceramic zirconia. The zirconia generates voltage from approximately 1V in richer conditions to 0V in leaner conditions. The heated oxygen sensor 1 signal is sent to the Engine Control Module (ECM). The ECM adjusts the injection pulse duration to achieve the ideal air-fuel ratio. The ideal air-fuel ratio occurs near the radical change from 1V to 0V.

OBDII Code P1143 2003 Nissan Sentra - Heated Oxygen Sensor 1 Lean Shift Monitoring Bank 1 - AutoCodes.com
P1143 2003 Nissan Sentra Code - Heated Oxygen Sensor 1 Lean Shift Monitoring Bank 1

Need More Information on the Code?

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