The OBD code P0143 for Toyota indicates an issue with the Heated Oxygen Sensor Bank 1 Sensor 3. Symptoms include the Engine Light ON, high fuel consumption, and excessive exhaust smoke.
The cause could be a faulty sensor, wiring harness issues, or poor electrical connections.
This is a moderate issue that should be addressed promptly.
A possible fix is to inspect and repair any damaged components or wiring connections related to the sensor.
| Repair Importance Level | 6.67 (Out of 10) |
| Estimated Repair Time | Approximately 1.0 hour |
| Repair Difficulty Level | 6.67 (Out of 10) |
Symptoms of the Toyota p0143 OBD Code
The vehicle may experience issues related to the oxygen sensor circuit malfunction (P0143).
- Symptoms for Toyota OBD code P0143 include: Engine Light ON.
- High Fuel Consumption.
- Excessive Smoke from Exhaust.
Causes of the Toyota p0143 OBD Code
P0143 in a Toyota indicates an issue with the oxygen sensor circuit low voltage.
Do you know you can clear most fault codes—but some could mean serious danger? Don’t take chances with your safety or your family’s safety. This budget-friendly car scanner makes it easy to clear fault codes in seconds while showing you exactly what’s wrong. Plug it in, connect to your Android or iOS phone, and instantly check live data. You’ll know if it’s a minor issue you can clear or something serious that needs attention—so you can drive safely and stress-free. (Today’s Deal)
- P0143 can be caused by a faulty Heated Oxygen Sensor Bank 1 Sensor 3.
- A Heated Oxygen Sensor Bank 1 Sensor 3 harness that is open or shorted.
- A Heated Oxygen Sensor Bank 1 Sensor 3 circuit with a poor electrical connection.
Fixing Toyota Error Code p0143 Step By Step
Replace the faulty oxygen sensor in bank 1 sensor 3 on a Toyota to resolve code P0143.
- To fix Toyota OBDII code P0143, first, review the possible causes related to the oxygen sensor circuit low voltage.
- Visually inspect the wiring harness and connectors for any damage.
- Check the connector pins for signs of being broken, bent, pushed out, or corroded.
- If no issues are found with the wiring, consider replacing the oxygen sensor.
- Clear the fault codes after the repair is completed.
Cost Of Fixing Toyota p0143 Fault Code
Diagnosing and repairing Toyota fault code P0143 typically involves testing and replacing the oxygen sensor.
The cost to diagnose and fix a Toyota OBD code P0143 typically ranges from $75 to $150, based on a 1. 0hour estimated repair time.
Factors like shop rates and complexity of the repair can influence the final cost.
That fault code is a turning point. If repair costs are climbing and your current loan feels like it’s holding you back, this is the time to plan ahead. The free Car Loan Payment Tracker helps you see how quickly you can pay off what’s left—and start preparing, with confidence, for your dream car.
Details of the Toyota p0143 OBD Code
Fault code P0143 in a Toyota indicates an issue with the oxygen sensor circuit low voltage for Bank 1 Sensor 3.
OBD code P0143 for Toyota vehicles indicates an issue with the O2 sensor circuit low voltage for Bank 1 Sensor 3. This code is triggered by the Engine Control Module (ECM) when it detects a voltage signal below the specified range from the downstream O2 sensor in Bank 1, Sensor 3. This sensor is typically located after the catalytic converter and is responsible for monitoring the efficiency of the catalytic converter.
If the voltage output is consistently low, it can indicate a problem with the sensor itself, the wiring, or the catalytic converter.
Mechanic’s Tech Notes
For Toyota code P0143, the rear oxygen sensor circuit low voltage is detected.
To diagnose and fix OBDII code P0143 in a Toyota, start by checking the wiring harness and connectors related to the oxygen sensor circuit.
Use a voltmeter to test the sensor’s voltage signal.
Ensure the sensor is receiving power and ground.
Scan tools can help monitor sensor data and confirm proper operation.
If the sensor readings are out of range, consider replacing the oxygen sensor.
Additionally, inspect the exhaust system for leaks that could affect sensor performance.
Clear the code after repairs and perform a test drive to verify the issue is resolved.
FAQ
OBD code P0143 in a Toyota means an issue with Heated Oxygen Sensor Bank 1 Sensor 3. Check sensor, wiring, and connectors for faults.
Common symptoms of fault code P0143 in a Toyota include Engine Light ON, High Fuel Consumption, and Excessive Smoke from Exhaust. Check and repair the Heated Oxygen Sensor Bank 1 Sensor 3 and related wiring.
Diagnose and repair OBD code P0143 in your Toyota by checking for a faulty Heated Oxygen Sensor Bank 1 Sensor 3 and related wiring issues.
Wrap Up
If your Toyota is displaying OBDII code P0143, you may experience poor engine performance, decreased fuel efficiency, or rough idling.
This code typically indicates an issue with the oxygen sensor circuit on bank 1 sensor 3. Possible causes include a faulty oxygen sensor, damaged wiring, or a poor electrical connection.
To address Toyota OBDII code P0143, start by inspecting the wiring harness for any signs of damage or corrosion.
Check the oxygen sensor connector for a secure fit and proper pin tension.
If no visible issues are found, consider replacing the oxygen sensor to resolve the
