Oxygen Sensor P0161

[mwmst]

I am getting "P0161 O2 Sensor Heater Circuit Malfunction (Bank 2 Sensor 2)" code on the below truck. I have reset it several times, and usually returns within 10 miles. Can someone provide the exact location of this sensor. I really do not want to change out more than one.

 

2003 Silverado Z71

5.3 Vortec

72000 miles

 

I can see the one about even with the drivers side front door, but it is right above the front drive shaft making is a little hard to reach.

 

Thanks,

mwmst

 

[GMTRUCKTECH]

I am getting "P0161 O2 Sensor Heater Circuit Malfunction (Bank 2 Sensor 2)" code on the below truck. I have reset it several times, and usually returns within 10 miles. Can someone provide the exact location of this sensor. I really do not want to change out more than one.

 

2003 Silverado Z71

5.3 Vortec

72000 miles

 

I can see the one about even with the drivers side front door, but it is right above the front drive shaft making is a little hard to reach.

 

Thanks,

mwmst

Bank2 sensor2 is located on the pass side exhaust behind the cat convertor.

 

[GMTRUCKTECH]

Bank2 sensor2 is located on the pass side exhaust behind the cat convertor.

[mwmst]

Thanks, that was it! $50 sensor and no more "Check Engine Light".

[TENN DAVE]

2003 Silverado Z71

5.3 Vortec

126k miles

 

Replaced sensor with BOSCH that is supposed to be exact replacement. At least bracket and harness was the same. Still have light after battery disconnect and three starts. Will check the fuse but what else is left to correct or get that the little light off.

Many thanks for your comments

[L_B]

Hi Tenn Dave,

 

I'm going through the same thing now - and was curious to learn what you did to get things right. Thanks for anything you can pass along.

 

L_B

2003 Silverado Z71

[gmtech4]

he hasn't fixed it yet ,he 's thread jackin and has no code ,so the waiting game begins lol

[L_B]

Hi GMTech4,

 

I'm still laughing

I've worked on cars for awhile, just old stuff (my other truck is a '49 Chevy 3600 <frame off_ground up Resto - original & pure - 46k miles>). So anyway, I was intimidated by the whole 02 sensor thing for the Silverado, until I read here and a couple of other places. I didn't realize that the same OBDii that reads the code can E-R-A-S-E it, too. So, I'm a slow learner, but all is well now. I appreciate the tips I've read here at gm-trucks. You guys are great!

 

Thanks,

L_B

[krazyHarry]

some relatively gd novice Silverado information on similar 02 code and using a reader @ http://diyproductreviews.blogspot.com/ . A little lenghty but overall helpful.