Asked in Toyota Tundra
Toyota Tundra

What does P0031 code on a 2003 Toyota Tundra?

Answer

Wiki User
12/11/2014

Oxygen (A/F) Sensor Heater Control Circuit Low (Bank 1 Sensor 1)

symptoms
Other than the MIL light illuminating you may not notice any performance issues.

cause
A short in the O2 sensor heater circuit or the sensor itself
A faulty O2 sensor heater
Wiring or connectors are broken or frayed to the sensor or relay
Bad PCM or ECM

The fix
Correct wiring short or loose connector found in inspection.
and/or
Replace the bank 1 sensor 1 O2 sensor


Wiki User
05/08/2009

Trouble code P0031 means: Oxygen Sensor Heater Control Circuit Low - Bank 1 Sensor 1