[Angate]

I've got a 2010 451 Pure. I'm getting codes P0131, P0130, P0135, all pointing to Bank 1 Sensor 1. Is this the downstream sensor?

 

[jwight]

Based on the nomenclature used in this illustration, it looks like the downstream sensor.

 

[Angate]

I saw that and I tend to agree with you but I would prefer to be as sure as possible before spending on the sensor and getting the wrong one. I will take the plunge on it if I can't find more though. Thank you

 

[gtdump]

I saw that and I tend to agree with you but I would prefer to be as sure as possible before spending on the sensor and getting the wrong one. I will take the plunge on it if I can't find more though. Thank you

You may want to consider replacing both anyhow as the effort to get to them is not trivial. If you're doing the work yourself it's just more time to replace later, but if you are taking it to the shop the cost of labor could exceed the sensors (I haven't priced them, but typical shop labor isn't cheap). Just a thought.