The P0043 trouble code is related to the HO2S (Heated Oxygen Sensor) Heater Control Circuit in Bank 1, Sensor 3. It indicates a potential low voltage issue with the heater control circuit of the oxygen sensor positioned in the exhaust system’s first bank and third sensor location. This code is often found in vehicles with advanced emission control systems.
HO2S Heater Control Circuit Low Bank 1 Sensor 3
Code symptoms P0043.
1. Increased fuel consumption.
2. Engine may run roughly.
3. Illuminated “Check Engine” or “Service Engine Soon” light on the dashboard.
This code is common in brands such as:: Chevrolet, Renault, Ford, Toyota, Nissan, Mercedes Benz, Honda.
Causes of the code P0043.
1. Faulty oxygen sensor heater.
2. Wiring or connector issues within the sensor circuit.
3. Problems with the Engine Control Module (ECM).
Code Solutions P0043.
1. Inspect and replace the oxygen sensor if the heater is faulty.
2. Check and repair any damaged wiring or connectors in the sensor circuit.
3. If ECM issues are suspected, consult a qualified technician for diagnosis and potential reprogramming or replacement.