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
Trouble code P0031 means: Oxygen Sensor Heater Control Circuit Low - Bank 1 Sensor 1
The 2003 Toyota Tundra has a V6 engine.
The 2003 Toyota Tundra has 24 valves.
The 2003 Toyota Tundra is a gas-powered vehicle.
The 2003 Toyota Tundra has a 5-speed manual.
The 2003 Toyota Tundra runs on regular unleaded.
The 2003 Toyota Tundra has double overhead cam (DOHC).
The height of the 2003 Toyota Tundra is 5 ft. 10.5 in. (70.5 in.).
The 2003 Toyota Tundra is 18 ft. 1.5 in. (217.5 in.) long.
The 2003 Toyota Tundra's turning circle is 44.9 ft..
The front track of the 2003 Toyota Tundra is 5 ft. 6.2 in. (66.2 in.).
The drivetrain warranty of the 2003 Toyota Tundra is 5 yr./ 60000 mi..
The ground clearance of the 2003 Toyota Tundra is 0 ft. 10.4 in. (10.4 in.).