My error code was bank 2, system too rich. I checked PCV valve and some other things and want to replace the o2 sensor on that side (the front o2 sensor). How do I know whether bank-2 refers to the driver or passenger side?

-Thanks.

 

Drivers side.

 

I thought bank1 referred to cylinder 1, which is drivers side and which'd make bank2 passenger side?

 

Good name.

Cylinder one is on the passenger side. 1234 P/S 5678 D/S

 

Good deal, I heard that one is easier to replace than the passenger side one.

 

Replaced o2 sensor. Filled up the gastank, drove 12.2 miles on .342 gallons.. thought wtf.. filled up, drove 1.1 miles... .4 gallons.. thought wtf...
Decided to test my new mileage on a full tank of gas, not just a few drops, because they aren't accurate.

 

 

I'm not smoking; that's what it said!

 

I don't dobt that that's what it said. Your screen name is accurate.