02 Sensor Problem
Thread Starter
Safety Car
Joined: Sep 2001
Posts: 4,267
Likes: 6
From: Cumming Ga
02 Sensor Problem
I got the code
P0140 Heated Oxygen Sensor (HO2S) Circuit Insufficient Activity Bank 1 Sensor 2
So I changed the rear drivers side 02 sensor, but the code re-appeared.
Checked the connections, seem ok, followed the wiring to the rear of the engine, that's all I could see. Found one fuse for all of the 02's seems to be ok.
Did I change the wrong sensor?
Need to get the car emissions tested!
Thanks
Tim
P0140 Heated Oxygen Sensor (HO2S) Circuit Insufficient Activity Bank 1 Sensor 2
So I changed the rear drivers side 02 sensor, but the code re-appeared.
Checked the connections, seem ok, followed the wiring to the rear of the engine, that's all I could see. Found one fuse for all of the 02's seems to be ok.
Did I change the wrong sensor?
Need to get the car emissions tested!
Thanks
Tim
Pro
Joined: Jun 2001
Posts: 605
Likes: 0
From: Summerville SC
tim
bank 1 sensor 2 is definitely the drivers side rear o2 sensor
my book says the fuse for that is #15 in the panel under the hood (15amps)
my shop manual assumes you have a diagnostic tool and tells to check voltages, but not sure how to do it without the gm tech tool
if i remember right, the wiring goes to the back of the engine to a connector just above were the exhaust manifold bolts to the exhaust pipe. sometimes those connectors dont like to push together all the way. also check to see if the wires may have gotten damaged laying on the exhaust. one of mine had come out of its clips before.
jake
bank 1 sensor 2 is definitely the drivers side rear o2 sensor
my book says the fuse for that is #15 in the panel under the hood (15amps)
my shop manual assumes you have a diagnostic tool and tells to check voltages, but not sure how to do it without the gm tech tool
if i remember right, the wiring goes to the back of the engine to a connector just above were the exhaust manifold bolts to the exhaust pipe. sometimes those connectors dont like to push together all the way. also check to see if the wires may have gotten damaged laying on the exhaust. one of mine had come out of its clips before.
jake
