Circuit Description

WARNING: This page is about a different car, the 2004 Lexus IS 300. However, it is still accessible from the selected car via links, so may be relevant.

Refer to DTC P0130: Oxygen Sensor Circuit (Bank 1 Sensor 1), DTC P0150: Oxygen Sensor Circuit (Bank 2 Sensor 1), DTC P2195: Oxygen Sensor Signal Stack Lean (Bank 1 Sensor 1), DTC P2196: Oxygen Sensor Signal Stack Rich (Bank 1 Sensor 1), DTC P2197: Oxygen Sensor Signal Stack Lean (Bank 2 Sensor 1), DTC P2198: Oxygen Sensor Signal Stack Rich (Bank 2 Sensor 1)

Fig 1: DTC P0134 & P0154 Chart

HINT:

Bank 1 refers to bank that includes cylinder No. 1.
Bank 2 refers to bank that does not includes cylinder No. 1.
Sensor 1 refers to the sensor closer to the engine assembly.
After confirming DTC P0134 and P0154, check the output voltage of the heated oxygen sensor in the "DIAGNOSIS / ENHANCE OBD II / DATALIST / ALL" using the OBD II scan tool or the hand-held tester. If output voltage of the heated oxygen sensor is always less than 0.1 V, heated oxygen sensor circuit may be open or short.