Toyota is showing P0154 and P0155. Is changing out the sensors likely to fix the problem?

Question

My 2003 Toyota Highlander (165,000 miles) is showing two error codes, P0154 and P0155. Is changing out the sensors likely to fix the problem, or is there something else I should ask the shop to check first that might save me money? How likely is it that the sensors are fine and the problem is something else? How likely is it that there s a problem with the computer rather than the sensors?

Answer 1

P0155 is for oxygen sensor bank 2 sensor 1 (most likely is its the oxygen sensor if you dont have an an wiring issues.

and P0154 is HO2S21 No Circuit Activity Detected which could mean

- Faulty Front Heated Oxygen Sensor Bank 2
- Front Heated Oxygen Sensor Bank 2 harness is open or shorted
- Front Heated Oxygen Sensor Bank 2 circuit poor electrical connection
- Inappropriate fuel pressure
- Faulty fuel injectors
- Intake air leaks may be faulty
- Exhaust gas leaks

Answer 2

P0154 Toyota Code - HO2S21 No Circuit Activity Detected
Read more: https://www.autocodes.com/p0154_toyota.html

P0155 Toyota Code - O2 Sensor Heater Circuit Bank 2 Sensor 1
Read more: https://www.autocodes.com/p0155_toyota.html