Getting P0158 bank2 sensor2, on I35. Where is this O2 Sensor

[lil754boy]

Where is this sensor located on a 02 I35? What's the average cost for this O2 Sensor. Are Autozone/PepBoys etc O2 sensors worh it?

[loystock]

Bank 2 refers to the left bank for Cylinders 2-4-6 towards the radiator and Sensor 2 means it is downstream (after) the Pre-Cat. If you follow the front exhaust manifold (Bank 2) you will find the Front O2 sensor with a Blue harness mounted just before the Pre-Cat. Just downstream of the Pre-Cat, at the manifold's elbow, you will find the Rear O2 sensor with Red harness. The connector is mounted close to the radiator (together with other O2 sensor connectors).

The best place to buy OE and OE-quality replacement O2 sensors and spark plugs is from NGK.com a.k.a. "sparkplugs.com." See the link below.

http://www.ngk.com/results_app.asp