Codes P0030 and P0135, where is the Upstream O2 Sensor located?

Hi,

The upstream (Sensor 1) o2 sensor is in the exhaust manifold. If you take a look at pic 1, I highlighted where to look. Picture 2 just indicates that number 10 in the picture is bank 1 sensor 1.

The last pic shows a view from the back of the engine (against the firewall). I circled the sensor.

If you plan to replace it, here is a link you may find helpful:

https://www.2carpros.com/articles/how-to-replace-an-oxygen-sensor

Let me know if this helps or if you have other questions.

Take care,

Joe

See pics below.