Northstar Engines and System Technical Discussion Discussion, PO155 (HO2S) Code in Cadillac Engine Discussion; Can any one tell me what this code means and where it is on the bank 2 (radiator side)? What ...
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
Automobile(s): White Diamond '03 DHS (with DTS floor shift)
Re: PO155 (HO2S) Code
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.