P012F

Symptoms

• Unstable engine operation
• Check Engine Light Illuminates
• Reduced engine efficiency
• Incorrect temperature readings on the dashboard

Causes

• Malfunction of the coolant temperature sensor (DTOZH)
• Malfunction of the engine oil temperature sensor
• Problems with the wiring harness or sensor connectors
• Engine oil level is low or very dirty
• Thermostat malfunction
• ECU software error

How to Fix

1. Check the level and condition of the engine oil
2. Visually inspect temperature sensors and their connections
3. Check sensor readings using a diagnostic scanner
4. If necessary, replace the faulty sensor
5. Check thermostat operation
6. Update ECU software (if appropriate updates are available)

Related codes

Error P012F by Vehicle Brand