On-Vehicle Inspection

WARNING: This page is about a different car, the 2006 Lexus GS 430. However, it is still accessible from the selected car via links, so may be relevant.

INSPECT HEATED OXYGEN SENSOR

Disconnect the sensor connector.

Measure the resistance of the sensor.

Standard resistance

HEATED OXYGEN SENSOR TERMINALS RESISTANCE SPECIFICATION

Tester Connection	Condition	Specified Condition
1 (HT) - 2 (+B)	20°C (68°F)	10 to 16 Ω
1 (HT) - 4 (+B)	20°C (68°F)	10 k Ω or higher

If the result is not as specified, replace the sensor.

Fig 1: Identifying Heated Oxygen Sensor Connector Terminals