B1s1 O2 SensorHow to tell which oxygen O2 sensor is which B1S1 B2S2 etc. I monitored both the B1S1 and B2S1 data streams on my OBDII tool, and both readings were very close to each other under the various driving conditions, so it looks like the sensor and wiring are working, or perhaps the sensor is breaking down intermittently. Follow the wire to the firewall and remove the clip and. There are 3 oxygen sensor on Lexus es300. This indicates the PCM has detected a problem with the bank 1 oxygen sensor. 2K subscribers Subscribe 557 Share. Sensor 1 refers to the upstream O2 sensor. This, is interpreted by the ECM as a low voltage condition and sets the MIL. Where is the Bank 2 Sensor 1 Located? Bank 2 Sensor 1 is the first sensor closest to the engine (Upstream) on Bank 2. I have since discovered that the B1 S1 sensor on a lot of vehicles today are Air/Fuel Sensors and they are different in how they behave vs. 5 engine* When I check out the rear oxygen sensor (B1 S2) it reads in the normal. See full list on mechanicbase. 2 percent of the o2 in the exhaust. The 2001 only has two O2 sensors, both on the exhaust pipes, one before the cat converter and one after. The 1st sensor is located closest to the engine, and the last is located toward the rear of the exhaust system. Sensor 1 on this engine IS NOT an O2 Sensor, it is an AIR/FUEL RATIO SENSOR!!! This sensor works very differently than an O2 Sensor, it outputs a steady. The oxygen sensor will be plainly visible on the exhaust manifold. com: Upstream B1S1 O2 Oxygen Sensor Replacement for Ford Focus 2003-2007 L4 2. When the bank one O2 sensor detects that the mixture is richer than the engine control module is calling for, it’ll throw P0172. If your Focus’s PCM detected a lean condition, it would store P0171. There are 3 oxygen sensor on Lexus es300 (B1s1, b1s2, b2s1) check sensor by the 2 black wides. B1S1 is Bank 1 Sensor 1 in the exhaust on the side that has #1 cylinder, BEFORE the cat. On a 2014 Chevrolet Silverado 1500 with the 5. The problem didn't move with the sensor. Nissan altima bank 1 sensor 1 location? b1s1 location What does gm obd code po133?. Wisconsin certified AMEDEE is online now. Bank 1 (B1) refers to the first bank of cylinders or 1-3 (first three as you look at it from the front) Bank 2 (B2) is the second bank of cylinders 4-6 (back cylinders closest to the fire wall). Got the OEM Denso from Advance Auto for $98. Sensor 2 is the downstream oxygen sensor. B1S1 O2 - B1S2 O2 oxygen sensor testing with data from OBD2 diagnostic (VectraB 1. Assume there is no O2 sensor code. 7 Connector Gender: Male Mounting Type: Threaded Bosch Exact Fit Oxygen Sensor 18075 Part # 18075 SKU # 179517 1-Year Warranty Check if this fits your 2011 Subaru Forester Free In-Store or. 02 Sensor Change, Bank 1, Sensor 1. P0131 means the O2 oxygen sensor's voltage remained low for longer than 2 minutes. P0132 – O2 Oxygen Sensor Circuit High Voltage (Bank1, Sensor1) What Does the P0132 Code Mean? The P0132 code indicates that there is a high voltage issue on your Oxygen sensor or Bank 1. 99 Sensor Type: Narrow-Band Wiring Harness Length: 20. The A/F voltage of my car would shoot up, always abruptly, to 4 or more volts (i. Essentially the same as P0136 and P0137 , a P0131 code refers to the first oxygen sensor on Bank 1. 02 in, Thread size: M18 mm, Wire harness length: 20. The 2001 only has two O2 sensors, both on the exhaust pipes, one before the cat converter and one after. Bank 1 sensor 1 would. Bank 1 Sensor 2 is the second sensor on the engine’s exhaust pipe (Downstream) on Bank 1, usually behind the catalytic converter. Is Bank 1 Sensor 1 Upstream?. The Bank 1 portion of the code refers to the side of the engine with the number one cylinder. Direct fit 5-wireA/F sensor. Air / Fuel Ratio Sensor. 1)Frequent and abrupt spikes in the voltages of the Air/Fuel (B1S1 Wideband O2) sensor when driving. The S550 has four - so your description of bank 1 does not tell if it is the forward or aft O2 sensor. What Does an Oxygen Sensor Do? O2 sensors keep track of the amount of oxygen in the exhaust. Now the O2 sensor (B1S2) may be giving a lower reading. briansmobile1 439K subscribers Subscribe 79K views. WHERE IS O2 SENSOR BANK 1 SENSOR 1 ON A CAR, OXYGEN SENSOR Auto Repair Guys 737K subscribers Subscribe 58K views 1 year ago WHERE IS O2 SENSOR BANK 1 SENSOR 1 ON A CAR, OXYGEN SENSOR If you. Combat Base C-2 Located at YD 137-647 in Quang Tri province, I Corps. P0131 Oxygen Sensor Circuit Low Voltage (B1S1) Technical Description Oxygen O2 Sensor Circuit Low Voltage (Bank 1, Sensor 1) What does that mean? This diagnostic trouble code (DTC) is a generic powertrain code, which means that it applies to OBD-II equipped vehicles. The IS300 has 4 oxygen sensors, named B1S1, B1S2, B2S1, and B2S2. However when I select the front oxygen sensor (B1 S1. - Heated Oxygen Sensor (H2OS) Bank 1 Sensor 3 circuit open shorted to ground - Heated Oxygen Sensor (H2OS) Bank 1 Sensor 3 circuit poor electrical connection B1S1 means first (upstream) , closest sensor to cyl. It will not generate any voltage if it fails completely. 99Sensor Type: Wide-BandWiring Harness Length: 11. Công Ty TNHH VLXD Diên Sanh chuyên: 1️⃣ Công Ty buôn bán vật liệu xây. On most in-line engines, the Bank 1 sensor 1 will be located at the engine’s front side, near the cylinder head. The oxygen sensor will be plainly visible on the exhaust manifold 4. This code occurs when the powertrain control module (PCM) detects that the oxygen sensor’s voltage reading is too high. Generally, if we are talking about O2 sensors: Sensor 1 = Before Catalytic converter Front. READ DESCRIPTIONBANK 2 SENSOR 1 DIY VIDEO ~ https://www. Buy Upstream B1S1 O2 Oxygen Sensor Replacement for Ford Focus 2003-2007 L4 2. head , usualy at exhaust manifold. Lambda will be correct at this fuel trim level only if the O2 sensor upon which the fuel trim is based is functioning correctly. The downstream is the sensor 2 on each bank. What side of motor is the sensor 1 Bank 1. Lambda will be correct at this fuel trim level only if the O2 sensor upon which the fuel trim is based is functioning correctly. Only 9 left in stock - order soon. FREE delivery Sat, Apr 22 on $25 of items shipped by Amazon. Bank 1 The side of the engine with the first cylinder is bank one. This important data helps ECU adjusts the air-fuel mixture for optimum efficiency. I had to un-do the engine/flap/cover that protects the engine from mud/rain etc in order to access the sensor. On most in-line engines, the Bank 1 sensor 1 will be located at the engine’s front side, near the cylinder head. Code P0030 stands for Oxygen O2 Sensor Heater Circuit Malfunction (Bank 1, Sensor 1). This is considered a Lean condition. Sensor 1 is BEFORE the cat and Sensor 2 is AFTER the cat. 2005-2010 Honda Odyssey Bank 1 Sensor 1 Replacement DIY - YouTube 0:00 / 1:51 2005-2010 Honda Odyssey Bank 1 Sensor 1 Replacement DIY MrRangerZr1 40. Nissan altima bank 1 sensor 1 location? b1s1. Any ideas? Thank Ask an Expert Car Questions Chevrolet Repair 2012 2500 6. And when buying sensor do you say sensor 1 Bank 1 left or right. 99Sensor Aftermarket part, Bank 1 Sensor 1 (B1S1). Direct fit oxygen sensor. O2 sensors generate a voltage when exposed to heat. The sensor after the cat on the same side is considered bank 1, sensor 2, or B1S2. P0131 Oxygen Sensor Circuit Low Voltage (B1S1) Technical Description Oxygen O2 Sensor Circuit Low Voltage (Bank 1, Sensor 1) What does that mean? This diagnostic trouble code (DTC) is a generic powertrain code, which means that it applies to OBD-II equipped vehicles. The 2001 only has two O2 sensors, both on the exhaust pipes, one before the cat converter and one after. 9K views 8 years ago (VectraB 1. Essentially the same as P0136 and P0137 , a P0131 code refers to the first oxygen sensor on Bank 1. B1S1 O2 sensor reads 1. 2005-2010 Honda Odyssey Bank 1 Sensor 1 Replacement DIY - YouTube 0:00 / 1:51 2005-2010 Honda Odyssey Bank 1 Sensor 1 Replacement DIY MrRangerZr1 40. What Does an Oxygen Sensor Do? O2 sensors keep track of the amount of oxygen in the exhaust. 7 Connector Gender: Male Mounting Type: Threaded Bosch Exact Fit Oxygen Sensor 18080 Part # 18080 SKU # 97219 1-Year Warranty Check if this fits your 2011 Subaru Forester Free In-Store or Curbside Pick Up. Now the O2 sensor (B1S2) may be giving a lower reading. The oxidation bed (pre-cat) then oxidizes, and removes all but around. How to tell which oxygen O2 sensor is which B1S1 B2S2 etc. Direct fit 5-wire A/F sensor. The stoichiometric voltage of my. Upstream sensor (located before catalytic converter) PRICE: 204. How to tell which oxygen O2 sensor is which B1S1 B2S2 etc. The most common O2 sensor voltage codes are: P0131 - O2 Sensor Circuit Low Voltage B1S1 P0132 - O2 Sensor Circuit High Voltage B1S1 P0137 - O2 Sensor Circuit Low Voltage B1S2 P0138 - O2 Sensor Circuit High Voltage B1S2 P0151 - O2 Sensor Circuit Low Voltage B2S1 P0152 - O2 Sensor Circuit High Voltage B2S1 P0157 - O2 Sensor Circuit Low Voltage B2S2. It MUST say "safe for O2 sensors" right on the label. Assume there is no O2 sensor code. P0131 means the O2 oxygen sensor's voltage remained low for longer than 2 minutes. 99 Wire Quantity: 4 Sensor Type: Narrow-Band Wiring Harness Length: 18. When the bank one O2 sensor detects that the mixture is richer than the engine control module is calling for, it’ll throw P0172. 3 V8, B1S1 would refer to the standard pre-cat O2 sensor on the exhaust manifold on the driver's side of the engine. Equip cars, trucks & SUVs with 2010 Subaru Forester Oxygen Sensor from AutoZone. The oxygen sensor immediately reports the change so that the less fuel the PCM injects into the engine, the smaller the voltage that the O2 sensor's voltage produces. Bosch engineered oxygen sensor. In some cases, there will be a Sensor 3. The task of this sensor is to measure the composition of raw exhaust fumes. 75 NTK Oxygen Sensor 27022 Part # 27022 SKU # 938717 1-Year Warranty Check if this fits your 2016 Ford Mustang Free In-Store or Curbside Pick Up SELECT STORE. Remove the zip tie holding the O2 sensor to the other wire bundle. The oxygen sensor immediately reports the change so that the less fuel the PCM injects into the engine, the smaller the voltage that the O2 sensor's voltage produces. It is stated on the forums to stay away from the Bosch generic sensors, as these don't work well with the engine management on the TL. O2 sensors generate a voltage when exposed to heat. The freeze frame data shows that the B1S2 oxygen sensor reads 0 volts. Its not that hard to replace O2 sensors on any of the MB I've owned (yet to do my S550), except the forward driver's sensor which can be obstructed somewhat by the steering linkage. There is an upstream O2 sensor (the sensor before the catalytic converter) and a downstream sensor (located after the catalytic converter). In-Depth Training For more information on interpreting O2 sensor data Walker Products has a great training guide which takes roughly 30-60 minutes to complete. The sensors at the front of the engine are considered B2S1 and B2S2, respectively. It’s almost impossible to see from the engine bay and you can basically access it under the vehicle or taking the passenger side tire off and bending or removing the inner wheel well liner. What does Bank 1 Sensor 1 Mean? These oxygen or O2 sensors are located between the bank 1 cylinder head and the corresponding catalytic converter. 64 Oxygen Sensors found View related parts 2006-2015 Honda Civic Sensor, Oxygen Part Number: 36532-RNA-A01 Vehicle Specific Other Name: Lower Oxygen Sensor; Oxygen Sensor $91. The problem didn't move with the sensor. 20 Oxygen Sensors found View related parts 2015-2019 Honda CR-V Sensor, Air Fuel R Part Number: 36531-5A2-A01 Vehicle Specific Other Name: Front Oxygen Sensor; Oxygen Sensor, Upper Oxygen Sensor $192. There are 3 oxygen sensor on Lexus es300 (B1s1, b1s2, b2s1) check sensor by the 2 black wides. Bosch engineered oxygen sensor. Uber Eats US | Food Delivery and Takeout | Order Online from. The front sensor, S1, can report in several different ways depending on the manufacturer. Replaced with a new one and the problem persists. I have since discovered that the B1 S1 sensor on a lot of vehicles today are Air/Fuel Sensors and they are different in how they behave vs. From this point on I’ll refer to both oxygen sensors air/fuel ratio sensors as O 2 sensors only. I just recently purchased a scan tool, the generic type that is supposed to work with all OBD-II compliant vehicles,*to read the various 'live data' streams from my2010 Jetta with the 2. B1S1 is Bank 1 Sensor 1 in the exhaust on the side that has #1 cylinder, BEFORE the cat. If lambda is essentially equal to 1. It measures the air-fuel ratio of the exhaust coming out of the exhaust manifold to maintain the 14. Oxygen Sensor. WHERE IS O2 SENSOR BANK 1 SENSOR 1 ON A CAR, OXYGEN SENSORIf you have a car and you need to replace oxygen sensor bank 1 sensor 1 / upstream oxygen sensor in. On most front-wheel-drive models with V6 engines, this sensor will be on the backside against the firewall. Direct fit 5-wireA/F sensor. Diagnostic trouble code (DTC) P0131 stands for “O2 Sensor Circuit Low Voltage (Bank 1, Sensor 1). Manufactured with precision to meet OE standards. 624volt B1S1 Trim 00. What Does an Oxygen Sensor Do? O2 sensors keep track of the amount of oxygen in the exhaust. Get it as soon as Friday, Feb 3. The rear sensor, S2, reports voltage in the manner you described. The stoichiometric voltage of my car is 2. Bank 1 sensor 1 would be the one before the cat, also known as the upstream. - YouTube 0:00 / 12:44 How to tell which oxygen O2 sensor is which B1S1 B2S2 etc. The sensor after the cat on the same side is considered bank 1, sensor 2, or B1S2. O2 sensor 1/1 is the upstream sensor on Bank 1 (different for a Ford than for a Chevy or a Dodge), and O2 sensor 1/2 is the downstream sensor on Bank 1. Other Name: Front Oxygen Sensor; Oxygen Sensor, Upper Oxygen Sensor. P0132 – O2 Oxygen Sensor Circuit High Voltage (Bank1, Sensor1) What Does the P0132 Code Mean? The P0132 code indicates that there is a high voltage issue on your Oxygen sensor or Bank 1. To verify the wiring, I plugged the B1S2 harness into the B2S2 o2 sensor and it worked plugged into the other side of the car. Use only Bosch for the best results. Bank 1 refers to the side of the engine that has the #1 cylinder. Buy HiSport Oxygen Sensor 234-9066 - Upstream Heated O2 Sensor Replaces 250-54022, 4-Wire Air Fuel Ratio, Sensor 1 Front B1S1 Before Catalytic. 2008 Toyota Highlander SR5, 1990 300zx NA-TT, 2011 Nissan rouge S, (RIP 2002 MDX Touring) B. Because of it's location and reading about almost everyone having problems with stripped threads, I decided to have the dealership do the work. B1S1 O2 sensor reads 1. The 2001 only has two O2 sensors, both on the exhaust pipes, one before the cat converter and one after. 1)Frequent and abrupt spikes in the voltages of the Air/Fuel (B1S1 Wideband O2) sensor when driving. You have to be very careful about what fluids/cleaners/additives you are using in today's engines. 99Sensor Type: Wide-BandWiring Harness Length: 31. WHERE IS O2 SENSOR BANK 1 SENSOR 1 ON A CAR, OXYGEN SENSOR Auto Repair Guys 737K subscribers Subscribe 58K views 1 year ago WHERE IS O2 SENSOR BANK 1 SENSOR 1 ON A CAR, OXYGEN SENSOR If you. Hill 558 Located at XD 820-451 in Quang Tri province, I Corps. 5 engine* When I check out the rear oxygen sensor (B1 S2) it reads in the normal. 1)Frequent and abrupt spikes in the voltages of the Air/Fuel (B1S1 Wideband O2) sensor when driving. Get Yours Today! We have the best products at the right price. Remove the upper part of the air filter box + the air filter. Or fastest delivery Thu, Apr 13. Any ideas? Thank - Answered by a verified Chevy Mechanic. Bank 1 Sensor 1 is located in front of the catalytic converter. Here are a few pics of location and install of my O2 sensor on my 2004 V8 with 160K miles. O2 sensor codes descriptions fall into the following categories: circuit problem, low voltage, high voltage, slow response, no activity or heater circuit problem. A B1S1 O2 sensor would be threaded into the exhaust system between the catalytic converter and the engine. 3 V8, B1S1 would refer to the standard pre-cat O2 sensor on the exhaust manifold on the driver's side of the engine. The 2001 only has two O2 sensors, both on the exhaust pipes, one before the cat converter and one after. O2 sensor 1 can also be called the upstream O2 sensor or bank 1 sensor 1. 64 Oxygen Sensors found View related parts 2006-2015 Honda Civic Sensor, Oxygen Part Number: 36532-RNA-A01 Vehicle Specific Other Name: Lower Oxygen Sensor; Oxygen Sensor $91. The 1st sensor is located closest to the engine, and the last is located toward the rear of the exhaust system. I just recently purchased a scan tool, the generic type that is supposed to work with all OBD-II compliant vehicles,*to read the various 'live data' streams from my2010 Jetta with the 2. In-Depth Training For more information on interpreting O2 sensor data Walker Products has a great training guide which takes roughly 30-60 minutes to complete. Lexus ES 300 oxygen sensor bank1 sensor1 10,953 views Oct 9, 2017 check sensor by the 2 black wides. Code P0030 stands for Oxygen O2 Sensor Heater Circuit Malfunction (Bank 1, Sensor 1). Only 6 left in stock - order soon. Air / Fuel Ratio Sensor. Position suffered only minor shelling and periodic probing. WHERE IS O2 SENSOR BANK 1 SENSOR 1 ON A CAR, OXYGEN SENSORIf you have a car and you need to replace oxygen sensor bank 1 sensor 1 / upstream oxygen sensor in. However when I select the front oxygen sensor (B1 S1. There are 3 oxygen sensor on. The 2001 only has two O2 sensors, both on the exhaust pipes, one before the cat converter and one after. - YouTube 0:00 / 12:44 How to tell which oxygen O2 sensor is which B1S1 B2S2 etc. Location: Reston VA. READ DESCRIPTIONBANK 2 SENSOR 1 DIY VIDEO ~ https://www. It is after the exhaust manifold and before the catalytic converter. The oxygen sensor will be plainly visible on the exhaust manifold 4. I monitored both the B1S1 and B2S1 data streams on my OBDII tool, and both readings were very close to each other under the various driving conditions, so it looks. The 2001 only has two O2 sensors, both on the exhaust pipes, one before the cat converter and one after. Bank 1 Sensor 2 is the second sensor on the engine’s exhaust pipe (Downstream) on Bank 1, usually behind the catalytic converter. 99 Wire Quantity: 4 Sensor Type: Narrow-Band Wiring Harness Length: 18. Bank 1 Sensor 2 (B1S2). 71 inch Connector Gender: Male, Connector Type: Direct fit, Heated: Yes, Length: 22. Bank 1 Sensor Compatible with Hyundai 2012 2013 2014 Accent Veloster, for Kia 2014-2012 Rio Soul 1. The vehicle had repeatedly returned with a code of P0031—O2 sensor B1S1 low current flow heater circuit failure (open circuit). 6 Mounting Type: Threaded Bosch Oxygen Sensor 17480 Part # 17480 SKU # 382820 1-Year Warranty Check if this fits your 2008 Volkswagen Jetta Free In-Store or Curbside Pick Up SELECT STORE. Essentially the same as P0136 and P0137 , a P0131 code refers to the first oxygen sensor on Bank 1. Generally, if we are talking about O2 sensors: Sensor 1 = Before Catalytic converter Front (Upstream O2 sensor) Sensor 2 = After Catalytic Converter Rear (Downstream O2 sensor) Some diesel engines have many exhaust temperature sensors. Follow the wire to the firewall and remove the clip and disconnect the O2 sensor wire from the connector. 3L Located in Manifold : Automotive. Each of these code descriptions are. B1S2 is one the same side as the one above but AFTER the cat. Wideband Air / Fuel Ratio Sensor OEM equivalent design Direct fit 4-wire A/F sensor. It is an oscillating sine wave, an O2 sensor. B1S1 O2 sensor reads 1. Manufactured with precision to meet OE standards. When it sends either signal, the control unit reacts and adjusts the fuel mixture. You have to be very careful about what. 0 $13699 Free In-Store or Curbside Pick Up SELECT STORE Home Delivery Standard Delivery Estimated Delivery May 03 Add TO CART Walker Oxygen Sensor 350-34129 Part # 350-34129 SKU #. B1S1 O2 - B1S2 O2 oxygen sensor testing with data from OBD2 diagnostic (VectraB 1. There is an upstream O2 sensor (the sensor before the catalytic converter) and a downstream sensor. the traditional B1 S2 sensor. On a 2014 Chevrolet Silverado 1500 with the 5. 99 Sensor Type: Narrow-Band Wiring Harness Length: 26. On a scan tool, the B1S1 and B2S1 are the front sensors, as the “S” means “side,” and “1” means that it is in front of “2,” which would be the rear sensor. 20 Oxygen Sensors found. 28 ( 30%) Check the fit Add to Cart Fits the following Honda CR-V Years:. The IS300 has 4 oxygen sensors, named B1S1, B1S2, B2S1, and B2S2. I used my tuner to read my O2 sensors and got the following: B1S1 Voltage. Notes: Aftermarket part, Bank 1 Sensor 1 (B1S1). Assume there is no O2 sensor code. Consider the O2 sensor. The Bank 1 portion of the code refers to the side of the engine with the number one cylinder. Here are a few pics of location and install of my O2 sensor on my 2004 V8 with 160K miles. Recently I received a code to replace my B1S1 O2 sensor which I did. To verify the o2 sensor works, I switched the two downstream sensors. B1S1 is Bank 1 Sensor 1 in the exhaust on the side that has #1 cylinder, BEFORE the cat. This item: Upstream B1S1 O2 Oxygen Sensor Replacement for Ford Focus 2003-2007 L4 2. Bank 1 sensor 1 would be the one before the cat, also known as the upstream. Bank 1 Sensor 1 is located in front of the catalytic converter. Can we narrow the field further?. There are 3 oxygen sensor on Lexus es300. Obviously, replacing the sensor was not the proper fix. 20 Oxygen Sensors found View related parts 2015-2019 Honda CR-V Sensor, Air Fuel R Part Number: 36531-5A2-A01 Vehicle Specific Other Name: Front Oxygen Sensor; Oxygen Sensor, Upper Oxygen Sensor $192. The new sensor was ordered. 99 Wire Quantity: 5 Sensor Type: Wide-Band Wiring Harness Length: 23. Add TO CART. O2 sensors generate a voltage when exposed to heat. Although generic, the specific repair steps may vary depending on make/model. You read how regular the wave is, how it responds after some throttle, things like that. com/watch?v=zmUXM-dbRf8Parts:2005-2006 A/F sensor: https://amzn. Bank 1 Sensor Compatible with Hyundai 2012 2013 2014 Accent Veloster, for Kia 2014-2012 Rio Soul 1. Lexus ES 300 oxygen sensor bank1 sensor1 10,953 views Oct 9, 2017 check sensor by the 2 black wides. Upstream sensor (located before catalytic converter). 1)Frequent and abrupt spikes in the voltages of the Air/Fuel (B1S1 Wideband O2) sensor when driving. The S550 has four - so your description of bank 1 does not tell if it is the forward or aft O2 sensor. Narrowband Oxygen Sensor OEM equivalent design Direct fit oxygen sensor. O2 sensor 1/1 is the upstream sensor on Bank 1 (different for a Ford than for a Chevy or a Dodge), and O2 sensor 1/2 is the downstream sensor on Bank 1. Notes: Aftermarket part, Bank 1 Sensor 1 (B1S1). 99Sensor Type: Narrow-BandWiring Harness Length:. Hill 516 Located at XD 799-459 in Quang Tri province, I Corps. It constantly sends signal from low to high (close to 0 to 1). Heated O2 sensors have four wires, and two of those wires are always the same color, sometimes white, sometimes brown. On a scan tool, the B1S1 and B2S1 are the front sensors, as the “S” means “side,” and “1” means that it is in front of “2,” which would be the rear sensor. The oxygen sensor will be plainly visible on the exhaust manifold.