Engine-Codes - Nissan - P1143 2003 NISSAN ALTIMA SEDAN

P1143 2003 NISSAN ALTIMA SEDAN Code - Heated Oxygen Sensor 1 Lean Shift Monitoring Bank 1

Repair Importance Level: 3/3
Repair Difficulty Level: 2/3  What is this?
Table of contents

|P1143 2003 NISSAN ALTIMA SEDAN code possible 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

|How is the P1143 2003 NISSAN ALTIMA SEDAN code repair?

Start by checking 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.

|P1143 2003 NISSAN ALTIMA SEDAN 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.

|What is the cost to diagnose the P1143 2003 NISSAN ALTIMA SEDAN code

Labor: 1.0

The cost to diagnose the P1143 2003 NISSAN ALTIMA SEDAN code is 1.0 hour of labor. The auto repair's diagnosis time and labor rates vary by location, vehicle's make and model, and even your engine type. Most auto repair shops charge between $75 and $150 per hour.

|When is the P1143 2003 NISSAN ALTIMA SEDAN code detected?

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

|What are P1143 2003 NISSAN ALTIMA SEDAN code possible symptoms?

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

|What is P1143 2003 NISSAN ALTIMA SEDAN code meaning?

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.

|Need more information with the P1143 2003 NISSAN ALTIMA SEDAN code?

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