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B2 S2 oxygen sensor location, know its after the cat but not sure which exhaust side,driver or passenger ?

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1 Answer

No way to help you, as no one coming to this
site ever even provides a vehicle or any info
at all
On all vehicles (except an inline 4 cyl) Bank 1 is the
side of motor that number one spark plug is on & Bank 2
in your case the other side.
How are you going to test the sensor without a professional
scanner to look at data,scope the sensor for switching times
& look at fuel trim ?
Your best to use Google & You Tube Video for all vehicle questions ,rather than ask for someone to tell you the answer.

Posted on Jul 09, 2013

  • Jerry Norris Jul 09, 2013

    Inspection station gave me the report calling out this sensor which failed my 97 Gmc truck for emissions. But they wanted $80 for part n $70 to put it in. Found the sensor for $43 n figure it can't be that hard to change after I figure out which of the four it is.

  • Anonymous Jul 09, 2013

    Doesn't mean the sensor is bad just because it was out of range at inspection. Has to be tested to find out if the sensor or something else is the problem. Could be a worn out exhaust converter PO420 or 430



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SOURCE: were is the front oxygen sensor located on a 1996 lincoln tow car

passenger side of manifold, before the catalytic converter. this system may have more than one on the frontside of the cat.

Posted on Feb 27, 2009

  • 41 Answers

SOURCE: ihave a 2002 suzuki xl7

Yes, If you have dual exhaust pipes coming from the engine, Look on the passenger side exhause pipe, and it will be the 1st sensor on the pipe coming out of the engine.

Posted on Apr 26, 2009

  • 79077 Answers

SOURCE: Replacing bank 1 sensor 2 and bank 2 sensor 1 oxygen sensors


Posted on Jun 24, 2009

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SOURCE: oxygen sensor confusion

1/1 is upstream sensor on the number 1 cylinder side, 1/2 is the downstream of the number 1 cylinder side, 2/1 is the upstream of the number 2 cylinder side, 2/2 is the downstream of the number 2 cylinder side. Hope this helps.

Posted on Aug 10, 2009

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  • 1986 Answers

SOURCE: toyota mr2 roadster 2001 engine light on code po141 oxygen sens

bank 1 will be whichever side cylinder 1 of your engine is and bank 2 will be the opposite side. It's named bank 1 and bank 2 so that no matter how the engine is laid out, bank 1 is always on the same side as cylinder 1. I cannot say whether the right hand or the left hand one will be bank 1 as I do not know where your cylinder 1 is. The garage should know

Posted on Sep 08, 2009

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07 suzuki xl7 po420 code. Oxygen sensor bank 2 sensor 1 i believe. Location in the engine. Thanks..

the cold from hell,,
CAT monitor. know it well, too well.

no its not that.
the code tells that engine has a lazy or dead cat.
no engine stated.
its and XL-7 not and XL7, they are different cars.
3.6L V6
bank one is failing the person who told you bank 2 is full of beans.

"Catalyst Efficiency Below Normal (Bank 1)" SM quote. we change the front B1S1 front sensor first.
then the B1S2, sensor next.
then the CAT if sure no exhaust leaks are on Bank1.
S1 is front
S2 is rear
bank 1, is cylinder 1 side
bank 1 is,, right bank, usa is passenger side

look for leaks first in exhuast
then bad 02s, on right side , damage to wires.
the new sensors.
then new cat, $$$$$$$$$$$$$$$$$$$ last

Mar 12, 2017 | 2007 Suzuki XL-7

1 Answer

P0172 and P0175 after replacement of cats and rebuilt injectors

Possible solutions include: Inspect all vacuum and PCV hoses, replace if necessary Clean the MAF sensor. Consult your service manual for it's location if you need help. I find it's best to take it off and spray it with electronics cleaner or brake cleaner. Make sure you are careful not to damage the MAF sensor, and make sure it's dry before reinstalling Inspect fuel lines for cracks, leaks, or pinches Check the fuel pressure at the fuel rail Check the fuel injectors, they may be dirty. Use fuel injector cleaner or get them professionally cleaned/replaced. Check for an exhaust leak before the first oxygen sensor (this is unlikely to cause the problem, but it is possible)

Read more at:

Sep 23, 2015 | Cars & Trucks

1 Answer

Location rear oxygen sensor, bank 2, volvo xc90 t6, 2.9 biturbo,2003

Passenger side exhaust is bank 1 driver side is bank 2. Second sensor downstream of the cat is sensor #2

Apr 07, 2015 | 2003 Volvo XC90

1 Answer

5.7L 6 cylinder 2002 chevy express van oxygen sensor locations?

It is possible it is in the passenger side exhaust manifold.

Jan 25, 2015 | Chevrolet Cars & Trucks

1 Answer

What causes01 audi allroad 2.7 liter fault code p0421

this can either be a bad cat or o2 sensor its the after cat downstream driver side you can either replace the o2 sensor or buy a spacer from 034 Motorsports to get rid of this problem or get a tune alls it does is checking if the cat is there for emissions will not effect gas mileage. Owner of Audi A6 2.7T 2001.B2 S1 is drivers side pre cat

B1 = Passenger side
B2 = Drivers side
S1 = Pre cat
S2 = Post Cat Example s1:b1

Jul 14, 2014 | 2001 Audi allroad quattro

1 Answer

Crysler aspen

O2 (B2 S2) Heater Circuit High (B2 S2 means bank 2 sensor 2)

Sounds like the rear O2 sensor on the passenger side is bad or unplugged.

Jan 28, 2014 | Cars & Trucks

2 Answers

Where B1S1, B1S2, B2S1, B2S2, O2 sensors are located before or after the catalytic converter passenger or driver side?

Hi, B1 refers to the left side of the engine as you look at the belts. B2 is the right side (bank 2).
S1 refers to the upstream sensor on the respective bank. These sensors are mounted in the exhaust manifold or just below the flange. S2 refers to the downstream sensor or the respective bank--the one after the catalytic converter. Please let me know if you have additional questions, and thanks for usinf FixYa.

Jan 11, 2011 | Ford Explorer Cars & Trucks

1 Answer

Oxygen sensor location

They are in the exhaust pipes. There are 4 of them. Bank 1 is the drivers side, Bank 2 is passenger, sensor 1 is before the cat, sensor 2 is after.
In the code discription it will tell you where the problem is. Like Bank 1 Sensor 2, would be the drivers side rear one.
Hope that helps.

Oct 17, 2009 | 1999 Chevrolet Silverado 1500

2 Answers

Were is the front oxygen sensor located on a 1996 lincoln tow car

passenger side of manifold, before the catalytic converter. this system may have more than one on the frontside of the cat.

Feb 27, 2009 | 1996 Lincoln Town Car

1 Answer

Need location of oxygen sensor

#3 - Under vehicle, passenger side, below seating area, mounted in exhaust pipe in rear of catalytic converter

#4 - Under vehicle, driver side, below seating area, mounted in exhaust pipe in rear of catalytic converter

In either case, it is mounted on the rear side of the Cat.

Thanks for using FixYa - a FixYa rating is appreciated!!

Feb 21, 2009 | 1995 Mercury Grand Marquis

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