[SOLVED] P1148 Code: Fix Closed Loop Control Function Bank 1 For Optimal Performance

The automobile fault code P1148 indicates a problem with the Heated Oxygen Sensor 1 Bank 1.

This can be identified by the Engine Light or Service Engine Soon Warning Light turning on.

The cause of this fault code could be a faulty sensor, an open or shorted circuit, or an issue with the electrical connection. 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 performance and efficiency of the vehicle.

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 p1148 fault code.

  • The symptoms of the automobile fault code p1148 include the Engine Light being ON or the Service Engine Soon Warning Light being illuminated.

The automobile fault code p1148 can be caused by a faulty Heated Oxygen Sensor 1 Bank 1, an open or shorted circuit, or an issue with the electrical connection.

  • The fault code P1148 can be caused by the following issues: a faulty Heated Oxygen Sensor 1 Bank 1, an open or shorted circuit for the Heated Oxygen Sensor 1 Bank 1, and an electrical connection problem with the Heated Oxygen Sensor 1 Bank 1 circuit.

To fix the p1148 fault code, start by visually inspecting the wiring harness, connectors, and components for any damage or corrosion.

  • To fix the automobile fault code p1148, first, check the possible causes mentioned above.
  • Then, visually inspect the wiring harness and connectors related to the issue.
  • Look for any damaged components and check if there are any broken, bent, pushed out, or corroded pins in the connectors.
  • This fix typically takes around 1.0 hour to complete.

The factors influencing the cost of diagnosing and fixing the automobile fault code p1148 are the estimated repair time of 1.0 hour and the hourly rate charged by auto repair shops, which typically ranges between $75 and $150.

The P1148 fault code refers to the closed loop control function of the Air Fuel Ratio (AF)Heated Oxygen Sensor 1 heater.

The Engine Control Module (ECM) is responsible for controlling the ONOFF duty of the sensor heater based on the engine’s operating condition.

This ensures that the temperature of the sensor element stays within the specified range. When the closed loop control function for bank 1 or bank 2 fails to operate while the vehicle is driving in the specified condition, the ECM will set the P1148 Diagnostic Trouble Code (DTC). This code indicates a problem with the closed loop control function of the sensor heater in either bank 1 or bank 2.

It is important to address this fault code promptly as it can affect the accuracy of the Air Fuel Ratio (AF)Heated Oxygen Sensor 1 readings. A malfunctioning closed loop control function can lead to improper fuel mixture, reduced fuel efficiency, and increased emissions. A thorough diagnosis and repair of the underlying issue is necessary to resolve the P1148 fault code and ensure optimal engine performance.

What are the possible causes of fault code P1148 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 P1148. This code is often caused by a faulty Heated Oxygen Sensor 1 Bank 1 or an open or shorted circuit in the sensor. To fix this issue, visually inspect the wiring harness and connectors related to the sensor. Look for any damaged components and check for broken, bent, pushed out, or corroded connector pins.

How can I visually inspect the wiring harness and connectors to fix fault code P1148?

If you’re dealing with fault code P1148 and your engine light is on, it’s time to take action. The most likely cause is a faulty Heated Oxygen Sensor 1 Bank 1 or an issue with the circuit or electrical connection. To fix this, start by visually inspecting the wiring harness and connectors. Look for any signs of damage, such as broken or bent pins, corrosion, or components that are out of place. This simple step can help you identify and resolve the issue quickly.

What should I look for when checking the connector’s pins to resolve fault code P1148?

When resolving fault code P1148, it is important to check the connector’s pins for any issues. Start by visually inspecting the wiring harness and connectors for any damage. Pay close attention to the connector’s pins and look for any signs of being broken, bent, pushed out, or corroded. These issues can cause a faulty connection and lead to the engine light being on. By checking and addressing these potential problems, you can effectively resolve the P1148 fault code.

p1148 error fault code explained

If your engine light is on and you’re seeing the P1148 fault code, it could be due to a faulty Heated Oxygen Sensor 1 Bank 1 or an issue with the circuit or electrical connection. To fix it, visually inspect the wiring harness and connectors, checking for any damage or corrosion. Look out for broken or bent pins on the connectors.

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