P0056

Symptoms

• The Check Engine light comes on on the dashboard
• Slight increase in fuel consumption
• Unstable engine idling in cold weather
• Deterioration in acceleration dynamics
• Increased toxicity of exhaust gases

Causes

• Open or short circuit in oxygen sensor heater wiring
• Faulty oxygen sensor with damaged heating element
• Oxidation or corrosion of sensor connector contacts
• Engine control module (ECM) malfunction
• Blown heater circuit fuse
• Poor ground or damaged ground wire

How to Fix

1. Read error codes and analyze data using a diagnostic scanner
2. Check the oxygen sensor heater circuit fuses.
3. Visually inspect the wiring and connectors of the oxygen sensor for damage.
4. Measure the resistance of the oxygen sensor heating element (should be 2-14 ohms)
5. Check the supply voltage at the sensor connector (should be about 12V)
6. Check the integrity of the wires between the sensor and the control unit
7. If necessary, replace the oxygen sensor
8. Clear error codes and test drive to verify troubleshooting

Related codes

Error P0056 by Vehicle Brand