AutoCodes.com | All About OBDII Engine Codes
AutoCodes - Toyota - P0051 Toyota

P0051 Toyota Code - Oxygen Sensor Heater Control Circuit Low Bank 2 Sensor 1

- Code Popularity: 86,184 Views
- Repair Importance Level: 2/3
- Repair Difficulty Level: 2/3
Table of contents
Share on Facebook   Share on Twitter   Share on Linkedin

What are the Possible Causes of the DTC P0051 Toyota?

NOTE: The causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes.
  • Faulty Air-Fuel Ratio (A/F) Sensor Bank 2 Sensor 1
  • Air-Fuel Ratio (A/F) Sensor Bank 2 Sensor 1 harness is open shorted to ground
  • Air-Fuel Ratio (A/F) Sensor Bank 2 Sensor 1 circuit poor electrical connection
  • Air-Fuel Ratio (A/F) Sensor Bank 2 Sensor 1 circuit fuse
  • Faulty Engine Control Module (ECM)
⚠ Does your Toyota have Safety Recalls? → Check here

How to Fix the DTC P0051 Toyota?

Review the 'Possible Causes' mentioned above and visually examine the corresponding wiring harness and connectors. Ensure to check for any damaged components and inspect the connector pins for signs of being broken, bent, pushed out, or corroded.

Code Tech Notes

There is a factory service bulletin for the following Toyota Models:

2004 Toyota Sienna
2004 Toyota Sienna Factory Service Bulletin OBDII Code P0051

2005-2007 Toyota Avalon
2008-2008 Toyota Camry
2005-2007 Toyota Avalon, 2007-2008 Toyota Camry Factory Service Bulletin OBDII Code P0051





User Submitted Video

Search for P0051 Toyota Questions and Answers: Search here →

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0051 Toyota code, it typically requires 1.0 hour of labor. The specific diagnosis time and labor rates at auto repair shops can differ based on factors such as the location, make and model of the vehicle, and even the engine type. It is common for most auto repair shops to charge between $75 and $150 per hour.

When is the Code Detected?

The P0051 is set when the ECM detects an excessively low voltage through the heated oxygen sensor heater circuit

What are Code Possible Symptoms?

  • Engine Light ON (or Service Engine Soon Warning Light)

Code P0051 Toyota Description

Air-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.

OBDII Code P0051 Toyota - Oxygen Sensor Heater Control Circuit Low Bank 2 Sensor 1 - AutoCodes.com
P0051 Toyota Code - Oxygen Sensor Heater Control Circuit Low Bank 2 Sensor 1

Need More Information on the Code?

Need more information on how to fix the P0051 Toyota code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P0051 Toyota code diagnosed by a professional: Find a repair shop in your area

Code P0051 Toyota comments

Help us improve AutoCodes.com. Leave a comment below or tell us if the information above helps you fix the code. What are the symptoms on your vehicle for the P0051 Toyota code? Have you replaced any parts?
Any information is appreciated. Thanks