Question about 1999 Toyota Sienna

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Where is Bank 2 Sensor 1 (B2S1) O2 sensor located on a 1999 Siena

Quoted price to replace is $280 (parts ) + $160 (labour). Is this an easy replacement?

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  • Anonymous Mar 27, 2014

    I need to replace my forward o2 sensor, where is that located and is it easy to replace?

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Bank one, sensor one is on the front of the engine, closest to the radiator.

Bank TWO, sensor one, is on the back of the engine, cosest to the firewall. That one is not easy to change, unless you have access to a vehicle hoist. Easier to get to it from under the car.

Hope htis helps; thanks for choosing FixYa!

Posted on Jan 19, 2009

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Thanks - after getting advice on FixYa decided to take it to the shop.

Posted on Feb 06, 2009

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2 Answers

2010 f-150 signal stuck lean bank 2 sensor 1


It could be the sensor, or a fuel mixture problem for that side.
A mechanic would use a scanner to watch the data flow on that sensor while making that side run rich.

Feb 23, 2015 | Cars & Trucks

1 Answer

For my o2 sensors the codes r bank 1 sensor1 bank 2 sensor 2 bank 2 sensor 1 bank 1 sensor sensor 2


Hi there:
Oxygen sensors are always numbered like this:
- Bank 1 sensor 1 or Bank 1 sensor 2
- Bank 2 sensor 1 or Bank 2 sensor 2



Keep in mind that Bank 1 is always the side of the engine where cylinder number 1 is located and, of course, 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) and Sensor 2 is always the downstream sensor (the one that is located AFTER the catalytic converter.


Hope this helps; also keep in mind that your feedback is important and I`ll appreciate your time and consideration if you leave some testimonial comment about this answer.

Thank you for using FixYa, have a nice day.

Jun 21, 2012 | Cars & Trucks

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Po174 and po154 what is possible solutions


P0154 - 02 Sensor Circuit No Activity Detected (Bank 2 Sensor 1)
The oxygen sensors are critical to the engine running properly. It basically informs the PCM (Powertrain Control Module) of oxygen content of the exhaust. The PCM then uses this information to regulate fuel into the engine and maintain proper air:fuel ratio. It is a four wire sensor, with the PCM providing a reference/signal voltage of about half a volt (0.5v) to the sensor. It usually provides a ground also. The other two wires are dedicated to the oxygen sensor heater element. This heater allows the sensor to warm up faster, which allows the engine to enter closed loop faster, reducing startup emissions. The heater element is supplied a 12v feed from the power distribution center (usually) and a ground.

The oxygen content of the exhaust affects the O2 sensor resistance. This resistance produces a counter voltage on the reference/signal wire that the PCM will use to analyze oxygen in the exhaust. Lean exhaust produces low voltage, while rich exhaust produces high voltage. The oxygen sensor is capable of varying between 0.9v (rich) and 0.1v (lean). Once the engine reaches closed loop, the O2 sensor should begin switching rapidly between rich and lean voltages 2-3 times per second. If for some reason the O2 sensor doesn't switch properly or "sticks", P0154 may set. This code indicates the O2 sensor isn't operating.


P0174 - System Too Lean (Bank 2)
Basically this means that an oxygen sensor in bank 2 detected a lean condition (too much oxygen in the exhaust). On V6/V8/V10 engines, Bank 2 is generally the side of the engine that doesn't have cylinder #1.

Note: This DTC is very similar to P0171, and in fact your vehicle may show both codes at the same time.

You will more than likely not notice any drivability problems, although there may be symptoms such as a lack of power, detonation (spark knock), and/or a hesitation/surge on acceleration.


If need additional details, just contact us. Hope this helps.

Oct 04, 2011 | 1999 Oldsmobile Alero

1 Answer

2004 Sequoia B2S1 o2 sensor - where is this located and is it easy to replace? Thank You!


Toyota Sequoia has 4 oxygen sensors... two on each side. The ones in front of catalytic are position one, and, after are position 2.

Bank 2 is on passenger side, Bank 1 is on driver's side.

Hope this helps (remember to rate and comment this free answer).

Sep 21, 2011 | 2004 Toyota Sequoia

1 Answer

Location of o2 sensor bank 1 sensor 2


Bank 1 sensor 2 is the O2 sensor behind the catalytic converter.

Apr 08, 2011 | 1999 Nissan Sentra

3 Answers

P1155 code for a toyota rav4 2002, engine lite came , took to parts store, put on diognostic machine , this code came up. wat does it mean?


Bank 2 sensor 1 Air fuel sensor heater circuit. This sensor is NOT an O2 sensor, though it operates like one and in the same location(in exhaust stream). Basically the PCM detected that the heater circuit was drawing excessive amperage or no amperage. Usually it's a bad a/f sensor and replacing it will fix it, however, it doesn't rule out the possibility of damaged wiring or an open in the power or ground circuit, or a short in the power or ground circuit.

Hope helps (remember rated this).

Aug 17, 2010 | 2002 Toyota RAV4

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
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This is Bank 1 (closer to the dash panel) Sensor 2 (located after the catalytic converter).

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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

O2 sensors in a 97 gmc 1500 with 5.7 liter


bank 1 is the drivers side bank, so b1s1 would be the drivers side closest to the engine. if the truck is equipped with several 02 sensors then bank 2 or b2s1 would be passenger side closest to the engine. those are called upstream o2 sensors and the others downstream b1s2 and b1s2 b= bank 1= drivers side s=sensor 2=downstream. hope this helps.

Feb 04, 2010 | 1997 Chevrolet K1500

2 Answers

Locate O2 Sensors


both these sensors are located before the catalytic converter,sometimes in the exhaust manifold. are you sure that's the problem. Usually they both don't go at the same time. Are they running rich or lean, get back to me and we'll go from there Thanks Ray

Nov 09, 2009 | 2000 Toyota Camry Solara

2 Answers

2005 gallant with O2 sensor engine light is one...how do I fix it?


have the engine light code scanned, and it'll tell you if it's bank 1 sensor 1, bank 1 sensor 2, bank 2 sensor 1, bank 2 sensor 4.

Bank 1 is on the same side as Cylinder 1
Bank 2 is on the opposite side of Cylinder 1

Sensor 1 is located before the catalytic converter.
Sensor 2 is located after the catalytic converter

Sep 11, 2009 | 2001 Mitsubishi Galant

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