View Full Version : PO155 (HO2S) Code

01-20-09, 07:10 PM
Can any one tell me what this code means and where it is on the bank 2 (radiator side)? What function does it perform? Is it hard to replace?
P0155 - Heated Oxygen Sensor (HO2S) Heater Performance Bank 2 Sensor 1

01-20-09, 08:09 PM
Yeah, that's the radiator side. Just like changing a spark plug, but you need a special socket for it. It measures the oxygen in the exhaust and reports it back to the PCM so that it can keep the fuel at a stoichiometric value.

01-20-09, 09:00 PM