Question about 1998 GMC Safari

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Is bank 1 on the o2 sensors the 1 located on the drivers side? Vehicle is a 98' GMC Safari 2wd.

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You have it right Avalanche.
Bank 1 is normally the one with the #1 cylinder side.
So Bank 1 sensor 1 is the first one downstream, bank 1 sensor 2 is the one after the catalytic converter.

Posted on Nov 20, 2009

Testimonial: "Thank you for the answer so quickly."

  • FUBAR Nov 20, 2009

    Glad I was able to help you along.
    Hope your repair goes well.
    Thank you kindly for the testimonial

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Yes!!!! You are correct!! Bank 1 would be on the left side...or drivers side of the motor. Any other questions get back to me...I'M HERE TO HELP!!!

Posted on Nov 20, 2009

Testimonial: "Thanks a lot, even though they are the same sensors it will save me some time."

  • Jason Lewis
    Jason Lewis Nov 20, 2009

    no problem...anything else keep me posted

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Related Questions:

1 Answer

How many o2 sensor are on a 2004 gmc yukon


Hi Charles,

GM products have 4 O2 sensors attached along the exhaust pipes coming off the manifold. Bank 1 is aligned to cylinder 1 on the engine which is the driver's side. Sensor 2 is the one after the convertor (Sensor 1 being the one before the convertor). Link attached for more information.

Oxygen Sensor Locations

I have changed out one of mine; quite easy, but you need a sensor wrench which you can find an any automotive store for around $15.

The part is available readily enough - link attached.

Good luck

Feb 07, 2015 | 2004 GMC Yukon

1 Answer

What is bank 2 sensor 1?


You must have v-6 or v-8 engine , bank determents the side of the engine and on yours bank 2 is the passenger side, an sensor 1 denotes before the catalytic converter .You vehicle has three o2 sensors ,two before the cat an one after .Up stream means before catalytic converter. / downstream after the catalytic converter .

Jan 22, 2015 | 2003 GMC Safari

1 Answer

What place is the bank 1 censor 3 on a s10 98 located


  • Bank 1 is referring to the side of the motor with cylinder 1, usually the driver side. And it would be the 3rd sensor back. Its probably not dual exhaust so its just referring to the rear o2 sensor located after the catylitic converter. Hope this helps.

Sep 03, 2014 | Cars & Trucks

1 Answer

Po135 02 sensor malfuntion bank need location driver side or pasenger side front or rear


Bank 1 sensor 1 this is the upstream O2 sensor closes to the engine on the driver side.

Jul 13, 2011 | GMC Safari Cars & Trucks

2 Answers

I have research around and found that the Bank 1 sensor 3 O2 sensor is post Cat. But when I got under there I dont see anything that could resemble a sensor. Where is it. Please help. Marc


try this
ALLDATA Editor's Note: Always verify #1 cylinder location prior to diagnosis and repair.

- Cylinder bank number one is the bank that contains number one cylinder.


See: Firing Order


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Cylinder #1 on left side.

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Cylinder #1 on right side.

- The first oxygen sensor in cylinder bank # 1 is numbered O2 Sensor 1/1.
- The second oxygen sensor in cylinder bank # 1 is numbered O2 Sensor 1/2.
- A third oxygen sensor in cylinder bank # 1 would be numbered O2 Sensor 1/3.
- The first oxygen sensor in cylinder bank # 2 is numbered O2 Sensor 2/1.
- The second oxygen sensor in cylinder bank # 2 is numbered O2 Sensor 1/1.



- If a V-6 or V-8 vehicle only uses one downstream Heated Oxygen Sensor (HO2S) it is numbered O2 Sensor 1/2, even if it uses two upstream HO2S.
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Jun 03, 2011 | 2001 Dodge Stratus

1 Answer

1999 GMC Tahoe 5.7L engine trying to locate O2 sensor bank 1? there are 4 on the vehicle 2 before the cataylic convertor and 2 after. Which one would it be? right front? left front? right rear? left rear?


Hi, There are 4 sensors, 2 pre catalytic converter, 2 post. The driver side is bank 1, and the passenger side is bank 2 .The foreward one in the pipe coming from the driver side is bank1 sensor 1, the rear sensor for the driver side is bank 1 sensor 2 . The other side would be the same, but bank 2. Good luck...

Sep 23, 2010 | 1999 GMC Yukon Denali

1 Answer

My 99 gmc sierra 2500hd has a bad o2 sensor sensor 1 bank 2 is that pass side front


bank 1 always refers to the bank that the No.1 cylinder is located and bank 2 is the other bank. Senspr 1 refers to the upstream oxygen sensor ( before the catalytic converter) sensor 2 refers to the downstream o2 sensor(after the cat) So if your No.1 cylinder is on the left side(drivers side) then your assumption is correct.

Jul 05, 2010 | Cars & Trucks

1 Answer

Where is bank one oxygen sensor located at on a 2003 yukon


Need more information but here is where all your O2 sensors are located
Bank 1 Sensor 1 - Driver's side, before catalytic converter Bank 1 Sensor 2 - Driver's side, after catalytic converter
Bank 2 Sensor 1 - Passenger side, before catalytic converter
Bank 2 Sensor 2 - Passenger side, after catalytic converter

Thank you for using fixya and good luck

May 13, 2010 | 2003 GMC Yukon XL

3 Answers

Where is the bank 2 sensor 1 located.


Oxygen sensors are always numbered like this:

Bank 1 sensor 1
Bank 2 sensor 1
Bank 1 sensor 2
Bank 2 sensor 2

some manufacturers use a kind of shorthand that reads different, but means the same thing:
Sensor 1/1 or O2s 1/1
Sensor 2/1 or O2s 2/1
Sensor 1/2 or O2s 1/2
Sensor 2/2 or O2s 2/2

Bank 1 is always the side of the engine where cylinder number 1 is located and, of coarse, Bank 2 is the opposite side.
On a 4 cylinder engine, there is only 1 bank and it is always referred to as Bank 1.

Sensor 1 is always the upstream sensor (The one located BEFORE the catalytic converter)
Sensor 2 is always the downstream sensor (the one that is located AFTER the catalytic converter.

Most GM engines have #1 cylinder located on the left bank, (or Driver's Side) of the engine,

So, the answer to your question would be that you are looking for the sensor located before the catalytic converter on the right (or Passenger Side) of the truck.

Oct 17, 2009 | 1996 Chevrolet K1500

1 Answer

94 gmc safari


hi there HO2S BANK 1 SENSOR 3 HEATER CIRCUIT LOW . this jiberish means that its an upstream preheated oxygen switch it may need to be replaced or one of the wires could be damaged take a look there is two o2 sensors on each side the more foreward ones are upstream and the ones located towards the muffler are called downstream . first thing id do is look for a bad or melted wire on one of the upstream sensors but in capital letters is the definition for code P0043 good hunting .

Jul 19, 2008 | 1994 GMC Safari

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