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Peugeot 308 P0054 O2 Sensor Bank 1 Sensor 2 Fault

In this scenario we look at the OBD2 fault/trouble code P0054. The description was HO2S Heater Resistance Bank 1 Sensor 2.
The vehicle is a Peugeot 308 from 2008, and is a 1.6 petrol engine. The engine light has illuminated on the dashboard, and the message centre above the radio displayed the message fault 'Depollution System Faulty'
The diagnostic tool we used to diagnose this fault was the iCarsoft i970 which is perfect for Peugeot & Citroen cars & vans.
The chances are that the fault is because of a faulty O2 sensor, and in most vehicles there will be 2 or more sensors, so how do we find the correct sensor to change?
Well, the answer is in the fault description. Along side the P0054, we see the wording 'Bank 1 Sensor 2'
In an in line 4 cylinder engine (like this one) there will only be 1 bank. You may have seen other faults which display a bank 2, this is generally only for V6 or V8 engines.
So the real question in this case is where is sensor 1 and where is sensor 2.
Sensor 1 is also known as upstream, front or PRE CAT (catalytic converter)
Sensor 2 is also known as downstream, rear or POST CAT.
So in this case there are only 2 O2 sensors installed in the vehicle, pre & post cat.
We need to change out sensor 2 which is post cat.
Before getting the fault, there were no reports of poor running, or poor mileage consumption, but this is only a possible symptom.

Peugeot P0054 Bank 1 Sensor 2 fault code O2 Sensor diagnostic
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