[SOLVED] P1143 Code: Fix Lean Shift Monitoring Bank 1 With Heated Oxygen Sensor

The automobile fault code P1143 indicates a problem with the Front Heated Oxygen Sensor Bank 1. This can cause the Engine Light to turn on, indicating a potential issue.

The possible causes include a faulty sensor, intake air leaks, open or shorted sensor harness, poor electrical connection, fuel pressure, or injectors. To fix this issue, it is recommended to visually inspect the wiring harness and connectors for any damage.

Check for broken, bent, pushed out, or corroded pins in the connectors. The repair time for this issue is estimated to be around 1.0.

It is important to address this problem promptly to ensure optimal engine performance.

Repair Importance Level10.0 (Out of 10)
Estimated Repair TimeApproximately 1.0 hour
Repair Difficulty Level6.67 (Out of 10)

When the engine light is on or the service engine soon warning light is illuminated, it could be a sign of the p1143 fault code.

  • The symptoms of the automobile fault code p1143 include the Engine Light being ON or the Service Engine Soon Warning Light being illuminated.

The automobile fault code p1143 can be caused by a faulty front heated oxygen sensor, intake air leaks, open or shorted sensor harness, poor electrical connection, fuel pressure issues, or malfunctioning injectors.

  • The fault code P1143 can be caused by the following issues: a faulty Front Heated Oxygen Sensor Bank 1, intake air leaks, an open or shorted harness for the Front Heated Oxygen Sensor Bank 1, a poor electrical connection in the Front Heated Oxygen Sensor Bank 1 circuit, fuel pressure problems, and issues with the injectors.

To fix the p1143 fault code, start by visually inspecting the wiring harness, connectors, and components for any damage or corrosion.

  • To fix the automobile fault code p1143, start by checking the possible causes mentioned above.
  • Then, visually inspect the wiring harness and connectors related to the issue.
  • Look for any damaged components and check for broken, bent, pushed out, or corroded connector pins.
  • This fix is estimated to take approximately 1.0 hour.

The factors influencing the cost of diagnosing and fixing the automobile fault code p1143 include the estimated repair time of 1.0 hour. Auto repair shops typically charge between $75 and $150 per hour for their services. These factors contribute to the overall cost of resolving the fault code.

The P1143 fault code refers to the Heated Oxygen Sensor 1 Lean Shift Monitoring Bank.

This sensor is located in the front tube of the exhaust system and is responsible for detecting the amount of oxygen in the exhaust gas compared to the outside air. It has a closed-end tube made of ceramic zirconia, which generates voltage ranging from approximately 1V in richer conditions to 0V in leaner conditions.

The signal from the heated oxygen sensor 1 is sent to the Engine Control Module (ECM), which then adjusts the injection pulse duration to achieve the ideal air-fuel ratio. The ideal air-fuel ratio is typically found near the radical change from 1V to 0V.

What are the possible causes of fault code P1143 in an automobile?

If you see the Engine Light ON or the Service Engine Soon Warning Light in your automobile, it could be due to fault code P1143. This code is often caused by a faulty Front Heated Oxygen Sensor Bank 1, intake air leaks, an open or shorted harness for the sensor, poor electrical connection in the sensor circuit, fuel pressure issues, or problems with the injectors. To fix this, you should visually inspect the wiring harness and connectors, checking for any damage or corrosion. Additionally, look out for broken, bent, pushed out, or corroded pins in the connectors.

How can I visually inspect the wiring harness and connectors related to the front heated oxygen sensor bank 1?

If you’re dealing with an illuminated Engine Light or Service Engine Soon Warning Light, the culprit could be a faulty Front Heated Oxygen Sensor Bank 1. Other potential causes include intake air leaks, an open or shorted harness, poor electrical connection in the circuit, fuel pressure issues, or problems with the injectors. To address this, start by visually inspecting the wiring harness and connectors. Look out for any damaged components and check for broken, bent, pushed out, or corroded pins in the connectors. Don’t forget to consider the possible causes mentioned earlier.

What should I look for when checking for damaged components and connector pins in order to fix fault code P1143?

When troubleshooting fault code P1143, start by checking for damaged components and connector pins. Visually inspect the wiring harness and connectors for any signs of damage. Look for broken, bent, pushed out, or corroded pins in the connectors. This can help identify any issues with the front heated oxygen sensor bank 1, intake air leaks, open or shorted harness, poor electrical connection in the circuit, fuel pressure, or injectors. By thoroughly examining these areas, you can pinpoint the cause of the problem and proceed with the necessary fix.

p1143 error fault code explained

If your engine light is on and you’re seeing the P1143 fault code, it could be due to a faulty front heated oxygen sensor in bank 1, intake air leaks, or issues with the sensor’s wiring harness or electrical connection. It’s also worth checking the fuel pressure and injectors.

To fix the problem, visually inspect the wiring harness and connectors, looking for any damage or corrosion.

Make sure to check for broken, bent, pushed out, or corroded pins on the connectors.

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