DTC P0036-12: HO2S Heater Control Circuit Bank 1 Sensor 2 Circuit Short to Battery; DTC P0036-14: HO2S Heater Control Circuit Bank 1 Sensor 2 Circuit Short to Ground or Open; DTC P0056-12: HO2S Heater Control Bank 2 Sensor 2 Circuit Short to Battery; DTC P0056-14: HO2S Heater Control Bank 2 Sensor 2 Circuit Short to Ground or Open; DTC P0141-18: O2 Sensor Heater Circuit Bank 1 Sensor 2 Circuit Current Below Threshold; DTC P0161-18: O2 Sensor Heater Circuit Bank 2 Sensor 2 Circuit Current Below Threshold; DTC P102A-9E: O2 Sensor Heater Performance Bank 1 Sensor 2 Stuck On; DTC P105A-9E: O2 Sensor Heater Performance Bank 2 Sensor 2 Stuck On [12/2019 - 10/2022]: Procedure

Refer to INSPECTION [12/2019 - 10/2022]

HINT: 

Perform "Inspection After Repair" after replacing the heated oxygen sensor.

Refer to INITIALIZATION [12/2019 - 10/2022]

Result

Result: 

NG 

REPLACE HEATED OXYGEN SENSOR. Refer to  REMOVAL [12/2019 - 10/2022] 

Result: 

OK 

See step  2

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Disconnect the heated oxygen sensor connector.
2. Turn the ignition switch to ON.
3. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   C49-2 (+B) - Body ground	Ignition switch ON	11 to 14 V
   C50-2 (+B) - Body ground	Ignition switch ON	11 to 14 V

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR (EFI-MAIN RELAY - HEATED OXYGEN SENSOR) 

Result: 

OK 

See step  3

1. Disconnect the heated oxygen sensor connector.
2. Disconnect the ECM connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   C49-1 (HT1B) - C54-50 (HT1B)	Always	Below 1 Ω
   C50-1 (HT2B) - C54-16 (HT2B)	Always	Below 1 Ω
   C49-1 (HT1B) or C54-50 (HT1B) - Body ground and other terminals	Always	10 kΩ or higher
   C50-1 (HT2B) or C54-16 (HT2B) - Body ground and other terminals	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  4

1. Clear the DTCs.

   Powertrain > Engine > Clear DTCs 

2. Turn the ignition switch off and wait for at least 30 seconds.

   Result

   Proceed to
   NEXT

Result: 

NEXT 

See step  5

1. Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.
2. Read the DTCs.

   Powertrain > Engine > Trouble Codes 

   Result

   Result	Proceed to
   DTCs are not output	A
   DTC P0036-12, P0036-14, P0056-12, P0056-14, P0141-18, P0161-18, P102A-9E or P105A-9E is output	B

Result: 

A 

CHECK FOR INTERMITTENT PROBLEMS. Refer to  CHECK FOR INTERMITTENT PROBLEMS [12/2019 - 10/2022] 

Result: 

B 

REPLACE ECM. Refer to  REMOVAL [12/2019 - 09/2020]  , or refer to  REMOVAL [09/2020 - 10/2022]