Codes: P0031 and P0051 need details on these error codes

Question

I know these are 02 sensors but need to find out which ones & location so i can replace them. Thanks in advance

Answer 1

HI there

These codes are for the heater circuits on the left and right front O2 sensors. These are the sensors before the catalytic converters. I would look for a fuse in the fuse box under the hood labeled A/F heater or O2 sensor because it's rare for both to fail at the same time.

P0051 TOYOTA - Oxygen Sensor Heater Control Circuit Low Bank 2 Sensor 1

Read more: https://www.autocodes.com/p0051_toyota.html

P0031 TOYOTA - Oxygen Sensor Heater Control Circuit Low Bank 1 Sensor 1

Read more: https://www.autocodes.com/p0031_toyota.html