Question about 2002 Honda Passport

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O2 Sensor Location

I can't locate the B2S1 Oxygen Sensor on my 2002 Honda Passport. What side is B1 or B2 Heater Group?

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The bank one O2 sensor is on the exaust manifold on the left side of motor. this means it's facing toward you because this is a transverse mounted engine...please rate this..thanks

Posted on Sep 06, 2008


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Posted on Jan 02, 2017


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I've replaced my O2 sensor Bank 1sensor1 on my 1998 Oldsmobile bravada and the check engine light came on again I've done it twice in a week trying to get my car smoged

I am assuming the code you are getting is for oxygen sensor b1s1? Double check which side is bank 1 if you have a v6.
Don't forget wiring issues also.An old trick on a v engine is you could wire b1s2 with b2s1 and just use the b2 sensor for both.

Apr 12, 2017 | 1998 Oldsmobile Bravada

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

Code P0155 in a 2002 jeep liberty what it is?

this is covered in the FSM book by jeep.
per engine. non stated, so.....?????

p0 are federal codes. (a standard)
and is oxygen sensor reads wrong.
B2 S1 is bad.
S1 is the front sensor.
bank 2 is the engine bank that has #1 cylinder.

the heater in side is blown out.
or the wires to it are bad..melted, cut, or connector to it rusty.
the ECU only knows, the heater fails to conduct current.
it sees the heater dead.
replace it or fix the wires to it.
same on all cars this. only bank varies.
next time post engine size. the line up.
some inline engines run 2 banks too, like calif cars do. not just V engines.
the left front cylinder is #1 on v6 Bank 1 IS LEFT

seen here.
if this is your V6 engine, the 02 (b2) is on right , front (means upstream) bad.

does this help, the inline on calif engine, inline it is rear top sensor. B2S1, on split exhaust manifolds. for calif.

Jul 04, 2014 | 2002 Jeep Liberty

1 Answer

Where is the a/f fuel sensor heater located on a 2002 highlander v6

a/f sensor honda crv calls it the same thing most people call it an o2 sensor but on some models they are wrong.
the a/f sensor has four wires two are the a/f portion two are the heater curcuit , this is internal to the sensor and does what it says heats the sensor on start up till the exhaust takes over then heat circuit switches off.. i know the crv one is like 230 bucks here in ontairio from dealer . you can get aftermarket o2's but not heard of a/f avail. try your local auto wreckers for one .. the scan that told you the heater circuit was bad should have said b1 s1 or b2 s2 type thing.. this refers to the location of the sensor bank one sensor one refers to odd cyl side of engine sensor above catalitic cnverter s2 refers to behind cat conv
ect... special socket may be needed to remove (accomodates wires) sum times 7/8 wrech will work do it cold or you may strip the threads coming out!!

Feb 03, 2012 | Toyota Highlander Cars & Trucks

3 Answers

2002 dodge caravan engine light on code showing p0135 .please advice.thanks.

  • O2 Sensor Heater Circuit Malfunction - Bank 1 - Sensor 1
  • Basically the ECM Electronic Control Unit has determined your O2 sensor is taking to long to begin reacting properly.
  • The causes could be
  1. O2 heater element resistance could be to high.
  2. An internal short or opening in the heater element.
  3. O2 heater circuit wiring with high resistance.
  4. Open or short to ground in the wiring harness.

  • The fixes are
  1. Check the harness and connector to the O2 sensor for shorts or ground.
  2. Replace that O2 sensor.

  • Bank 1 sensor 1 location for this vehicle is located on the exhaust manifold back by the firewall on top of the manifold..
  • Thank you for using FixYa

Regards, Tony

Jun 19, 2011 | 2002 Dodge Grand Caravan

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

Troubleshooting code b1 s1 and b2 s1

b1s1 and b2s1 is the location of your two upstream o2 sensors not a trouble code(dtc). although these are common to go bad both sensors on both engine banks(sides) is somewhat odd. you may have an underlying problem. you may wish to have your technician connect a scanner and check your long and short term fuel trim values to rule out any other problems. if this was helpful please leave positive rating.

Nov 30, 2010 | 2001 Lexus RX 300

1 Answer

2006 hundai elantra P2270 code. If this is an O2 sensor, which one?

Possible O2 sensors:

P2270 O2 Sensor Signal Stuck Lean Bank 1 Sensor 2
P2271 O2 Sensor Signal Stuck Rich Bank 1 Sensor 2
P2272 O2 Sensor Signal Stuck Lean Bank 2 Sensor 2
P2273 O2 Sensor Signal Stuck Rich Bank 2 Sensor 2
P2274 O2 Sensor Signal Stuck Lean Bank 1 Sensor 3
P2275 O2 Sensor Signal Stuck Rich Bank 1 Sensor 3
P2276 O2 Sensor Signal Stuck Lean Bank 2 Sensor 3
P2277 O2 Sensor Signal Stuck Rich Bank 2 Sensor 3
P2278 O2 Sensor Signals Swapped Bank 1 Sensor 3 / Bank 2 Sensor 3
This is Bank 1 (closer to the dash panel) Sensor 2 (located after the catalytic converter).

Note: A malfunctioning front oxygen sensor may cause fuel trim codes to set.
  1. Several Diagnostic Trouble Codes use specific terminology to refer to sensor location. The illustration and key below explain the following terms:
  2. Engine BANK Bank 1 is closer to the dash panel, (also referred to as RH or right hand). Bank 2 is closer to the radiator, (also referred to as LH or left hand).
  3. UP Refers to Sensor 1 or "front sensor". It is located closer to the exhaust manifold and before the catalytic converter.
  4. DOWN Refers to Sensor 2 or "rear sensor." It is located after the catalytic converter.
  5. The following examples show how to interpret oxygen sensor terminology:
  6. B1/S1 = Bank 1/Sensor 1 = Dash panel side, BEFORE the catalyst or "upstream"
  7. B2/S2 = Bank 2/Sensor 2 = Radiator side, AFTER the catalyst or "downstream"

Aug 06, 2010 | Hyundai Elantra Cars & Trucks

1 Answer

Location of the bank 1 sensor 2 O2 sensor on a 2001 ford escape

B1 means the sensor is located on the same bank of the engine that has the #1 cylinder. B2 is located on the opposite bank.
S1 means the sensor is located BEFORE the catalytic converter
S2 means the sensor is located AFTER the catalytic converter

You didn't say which engine you have, so I've included the diagrams of both 4 cyl and 6 cyl so you can see the banks


Oct 20, 2009 | 2001 Ford Escape

1 Answer

Oxygen sensors

you have four on this truck. bank one sensor one is "black and white" b1 s2 "brown" b2s1 "light green" b2 s2 "red/white" good luck post as fixed thanks

Sep 20, 2008 | 2003 GMC Sierra 1500

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