What does OBD2 code P0143 mean?+
P0143 stands for O2 Sensor Circuit Low Voltage Bank 1 Sensor 3. The Bank 1 Sensor 3 oxygen sensor is reading consistently low voltage (lean).
What causes code P0143?+
Exhaust leak before sensor; Faulty O2 sensor; Lean fuel condition
How do I fix code P0143?+
Check for exhaust leaks; Test sensor voltage; Replace sensor if faulty
How much does it cost to fix P0143?+
Estimated repair cost for P0143 is $100-$350.
Is P0143 DIY-friendly?+
Yes — P0143 is generally DIY-friendly with basic tools.
