P0031 2005 TOYOTA PRIUS - Oxygen Sensor Heater Control Circuit Low Bank 1 Sensor 1
P0031 2005 TOYOTA PRIUS Possible Causes
- Faulty Air-Fuel Ratio (A/F) Sensor Bank 1 Sensor 1
- Air-Fuel Ratio (A/F) Sensor Bank 1 Sensor 1 harness is open shorted to ground
- Air-Fuel Ratio (A/F) Sensor Bank 1 Sensor 1 circuit poor electrical connection
- EFI relay (integration relay)
- Faulty Engine Control Module (ECM)
First diagnose P0031 2005 TOYOTA PRIUS code
Check the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded terminals.
P0031 2005 TOYOTA PRIUS Tech NotesCheck EFI relay (integration relay) before checking or replacing the oxygen sensor.
Cost of diagnosing the P0031 2005 TOYOTA PRIUS code
Labor: 1.0The cost of diagnosing the P0031 2005 TOYOTA PRIUS code is 1.0 hour of labor. The auto repair labor rates vary by location, your vehicle's make and model, and even your engine type. Most auto repairs shops charge between $75 and $150 per hour.
When is the P0031 2005 TOYOTA PRIUS code detected?The P0031 is set when the ECM detects an excessively low voltage through the heated oxygen sensor heater circuit
P0031 2005 TOYOTA PRIUS Possible Symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
P0031 2005 Toyota Prius DescriptionAir-Fuel Ratio (A/F)sensor need to reach a minimum operating temperature of 1200 degrees F to produce an accurate voltage signal. The faster the air-fuel ratio sensor reaches that temperature the faster the sensor will start sending an accurate signal to the Engine Control Module (ECM).
In order to achieve the require temperature, a heater element is included inside the air-fuel ratio sensor. The ECM controls the air-fuel ratio sensor heater element based on signals from the engine coolant temperature and engine load. The ECM controls the heater element circuit by allowing current flow to ground.
The ECM monitors the voltage signal received through the heater element circuit and determines the state of the circuit by comparing the voltage detected with the factory specifications.
P0031 2005 TOYOTA PRIUS More InformationNeed more information on how to fix the P0031 2005 TOYOTA PRIUS code?
Get Access to Factory Service Manuals
Need more help?Get the P0031 2005 Toyota Prius code diagnosed by a professional: Find a repair shop in your area
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