C.E.L. code P0134 which o2 sensor do i replace?

[scott_fx]

Hello, I have the following error code: P0134 Heated Oxygen Sensor (HO2S) Circuit Insufficient Activity Bank 1 Sensor 1 which o2 sensor is that? (we have four don't we?) thanks in advance. scott

[bshell]

Bank 1 = driver's side, Sensor 1 = pre-cat.

[scott_fx]

thank you very much.

[Mr. Lucky]

Originally Posted by bshell

Bank 1 = driver's side, Sensor 1 = pre-cat.

but this could also be caused by an exhaust leak before (or near) the catalytic converter - check the easy stuff first.

[John@SDPC]

Check easy things first. Here are some detailed diagnostic steps for that DTC.

[patton]

A.I.R. pump not working can pop that code once and awhile . get a scan tool that can watch all 4 sensors at once . if you have alot of miles i would change all 4 . $ it hurts but only if that one is bad