P0143 Code - O2 Sensor Circuit Low Voltage Bank 1 Sensor 3
Quick Answer
The rear heated oxygen sensor (or sensor 3 for some vehicles), after three way catalyst (manifold), monitors the oxygen level in the exhaust gas on each bank. Common causes include Faulty Heated Oxygen Sensor Bank 1 Sensor 3, Heated Oxygen Sensor Bank 1 Sensor 3 harness is open or shorted, Heated Oxygen Sensor Bank 1 Sensor 3 circuit poor electrical connection. Severity is Moderate - service should be scheduled soon. The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.
- What it means
- P0143 indicates O2 Sensor Circuit Low Voltage Bank 1 Sensor 3.
- Common causes
- Common causes include Faulty Heated Oxygen Sensor Bank 1 Sensor 3, Heated Oxygen Sensor Bank 1 Sensor 3 harness is open or shorted, Heated Oxygen Sensor Bank 1 Sensor 3 circuit poor electrical connection.
- Severity
- Moderate - service should be scheduled soon.
- Can I drive?
- The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.
Code P0143 Description
This sensor is made of ceramic zirconia. The zirconia generates voltage from approximately 1V in richer conditions to 0V in leaner conditions. Under normal conditions the heated oxygen sensor 3 is not used for engine control operation.
What are the Possible Causes of the DTC P0143?
- Faulty Heated Oxygen Sensor Bank 1 Sensor 3
- Heated Oxygen Sensor Bank 1 Sensor 3 harness is open or shorted
- Heated Oxygen Sensor Bank 1 Sensor 3 circuit poor electrical connection
How to Fix the DTC P0143?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P0143 code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
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Information for Specific Makes
- P0143 Infiniti — Heated Oxygen Sensor 3 Heater Control Circuit High
- P0143 Mercedes-Benz — O2 Sensor Circuit Low Voltage Bank 1 Sensor 3
- P0143 Mitsubishi — Heated Oxygen Sensor Heater Control Circuit Low Voltage Bank 1 Sensor 3
- P0143 Nissan — Heated Oxygen Sensor 3 Heater Control Circuit High
- P0143 Toyota — HO2S13 Circuit Low Voltage
- P0143 Volkswagen — O2 Sensor Circuit Low Voltage Bank 1 Sensor 3
Frequently Asked Questions about P0143 Code
1. What are the common symptoms of OBDII code P0143?
- Common symptoms include poor fuel economy, engine misfires, rough idling, and illuminated Check Engine light.
2. What does the O2 Sensor Circuit Low Voltage Bank 1 Sensor 3 code mean?
- This code indicates that the oxygen sensor located in Bank 1 Sensor 3 is reporting a voltage lower than expected.
3. What are the possible causes of OBDII code P0143?
- Possible causes include a faulty oxygen sensor, damaged wiring or connectors, exhaust leaks, or issues with the engine's fuel system.
4. How can I diagnose the cause of O2 Sensor Circuit Low Voltage Bank 1 Sensor 3 code?
- Diagnosing the issue may involve visually inspecting the sensor and its wiring, performing voltage tests, and using a scan tool to monitor sensor data.
5. Can I drive my vehicle with OBDII code P0143?
- It is generally not recommended to drive with this code present, as it can lead to decreased fuel efficiency and potential damage to the engine over time.
6. How can I repair OBDII code P0143?
- Repair options may include replacing the oxygen sensor, repairing damaged wiring, fixing exhaust leaks, or addressing any issues with the fuel system.
7. Is it possible to reset the O2 Sensor Circuit Low Voltage Bank 1 Sensor 3 code without fixing the underlying issue?
- While clearing the code may temporarily turn off the Check Engine light, the issue causing the code will likely persist and trigger the code again.
8. How much does it typically cost to repair OBDII code P0143?
- The cost of repair can vary depending on the cause of the issue, but it may range from $100 to $300 for parts and labor.
9. Can a DIY enthusiast fix O2 Sensor Circuit Low Voltage Bank 1 Sensor 3 code at home?
- Depending on the cause of the code, DIY enthusiasts with some mechanical knowledge and tools may be able to address the issue themselves.
10. How often should I check the oxygen sensors in my vehicle to prevent OBDII code P0143?
- It is recommended to inspect and test the oxygen sensors during routine maintenance or whenever you experience symptoms of poor engine performance.
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