P0143 Fault Code
P0143 OBD-II Trouble Code Short Description
O2 Sensor Circuit Low Voltage (Bank 2 Sensor 3)
What does trouble code P0143 mean?
The P0143 code indicates a problem with the oxygen sensor circuit that is providing low voltage readings for Bank 2 Sensor 3. This sensor is vital for monitoring the oxygen levels in the exhaust gases, which helps to optimize the air-fuel mixture for engine performance and emissions control. When the voltage from this sensor is low, it can lead to inefficient engine operation and increased emissions.
Symptoms
What are the symptoms of the P0143 code?
- Check Engine Light (CEL) illuminated
- Decreased fuel efficiency
- Rough idling or stalling in some cases
- Emissions test failure
- Observable decrease in engine performance.
Causes
What causes the P0143 code?
- Faulty oxygen sensor (Bank 2 Sensor 3)
- Wiring issues or damaged connectors related to the sensor
- Poor ground connection for the oxygen sensor
- Issues in the engine control module (ECM)
- Exhaust leaks affecting sensor readings.
Possible Solutions
How to fix P0143?
- Inspect the wiring and connections for the oxygen sensor for any signs of damage or corrosion.
- Replace the faulty oxygen sensor if necessary.
- Ensure the ground connections are secure and functioning properly.
- Repair any exhaust leaks that could be affecting sensor performance.
- Reset the check engine light and perform a test drive to monitor for code reappearance.