This is an email I just sent to Bosch after buying my sensors an hour ago, just seeing if I can get some insight from here in the forum. thanks. I have a question about oxygen sensors. I have a 2000 Ford Ranger 2WD 4.0L 6 Cylinder XLT Pickup. I plug that into Advance Auto Parts website to find the matching O2 sensors. I need Left and Right Upstream
sensors. I purchased what said to Be the Right Upstream and Left upstream. I bought these exact ones Part No. 15716 For the LEFT Part No. 15718 For the RIGHT So as I'm picking up my order I pre paid online for, I checked the contents to see if anti seize was already included on the threads by Bosch (which it was thanks). But I noticed the wire length of
both 15716 and 15718 were the same. But advance auto Parts website states in the links that And the 15716 is Both of the wires are 10.6". Which, although a bit alarming since the description stated 18.9 inches, is fine with me because the cables on my existing original O2 sensors are 10.6". However when checking this, I accidentally
mixed up which sensor was in which box. And I checked the model numbers stamped into the actual item but they are both the same thing. They both say but ones says and the other says The boxes are different, one says 15718 and the other says 15716 (but I mixed them up and don't know which is which although alarming is that both have stamped into them 025800 5716. I asked the guy at the store to check another box of either of these so I can know which is which based on the stamped numbers on the actual item but I bought the last one of each. I asked to just refund the order and I would buy from another Advance auto Parts but he said it was saying it can't be returned. So my questions to you are, which of these is Right and which is Left? I know sometimes it might not even matter (as long as they're both upstream sensors, or downstream sensors), but I don't want to chance it (and replacing these is a nightmare in a tiny space on this engine). If they were universal, then I doubt all the major parts sites specify differnt parts for each Left and Right. also, can you tell me Right and Left, which is Passenger side and which is Driver side? Thanks  A car may include several sensors such as an air-fuel ratio sensor, parking sensor, tire pressure monitor, oxygen sensor, etc. Each sensor is used for a specific purpose so that that vehicle runs at optimal efficiency. Amongst these sensors, the oxygen sensor is considered to be the most important one. There are two types of Oxygen sensors, Upstream and Downstream. In this article, we will be discussing both these oxygen sensors in detail.
Let’s first have a look at how one is different from the other.
The location of an O2 sensor is relative to the catalytic converter. An upstream sensor is closer to the head, whereas a downstream one is present at the back of the catalytic converter(CAT). In other words, an upstream is before the CAT and is also known as pre-CAT, whereas the downstream is after the CAT; therefore, it is known as post-CAT. Another important factor that you must consider is to determine Bank One And Bank Two. To determine these respective banks, you will have to view the picture of your vehicle’s firing order. In the picture, whichever Bank contains cylinder 1 is Bank 1, whereas the other either has or doesn’t have cylinder two will be Bank 2.
As far as the working of both sensors is concerned, upstream is amongst the main inputs for fuel control, whereas the downstream is for emissions and On-board Diagnostics (OBD). The main function of an upstream sensor is to determine the amount of NOx coming out of the engine and adjust the fuel/air ratio accordingly. On the other hand, the downstream o2 sensor function is to determine whether the CAT is doing its job. If we further look into their working, it can be said that upstream provides data for Air to Fuel ratio, whereas the downstream keeps track of the CAT’s status and ensures it is not clogged and still working. When installed in a modern OBD2 vehicle, the downstream O2 sensor determines the working of the catalytic converter. In contrast, in OBD 2 and later, it ensures enough oxygen for an efficient catalytic process. How to visually identify upstream vs. downstream O2 sensors?New car enthusiasts question how we can identify an upstream and downstream O2 sensor. Now, an upstream, as well as downstream sensor both, have some aesthetic differences. Some common identity differences between the both are the following:
Can I Use a Downstream Oxygen Sensor for Upstream?You may be thinking, Can I use a downstream oxygen sensor for upstream? Then a simple answer to this question is No. You can not use downstream oxygen sensors for upstream because they have different part numbers and their connections are different; therefore, neither you can mix them nor interchange them. Product RecommendationsOxygen Sensor Dodge RamBosch Oxygen Sensor, Original Equipment for Dodge Ram. See the latest price here. O2 Sensor for Toyota CamryOxygen Air Fuel Sensor for Toyota Camry. See the latest price here. O2 Sensor for Nissan AltimaO2 Oxygen Sensor for Nissan Altima. See the latest price here. What are the Upstream and Downstream O2 Sensor Readings?An important thing you must know about both the sensors is their readings. An oxygen sensor reads oxygen levels only; therefore, their voltage range is 0.10 – 0.90 volts. 0.10 volts indicates high oxygen levels, whereas 0.90 volts indicates low oxygen levels. If the fuel mix is correct they will be .30-.70v, the sweet spot is .45v Since the downstream sensor comes after the catalytic converter, it sees cleaned exhaust; therefore, it must indicate lower voltage and high oxygen levels, whereas the upstream sensor must indicate high voltage and low oxygen low levels. How to Tell If Upstream or Downstream O2 Sensor is Bad?Identifying a bad sensor is very important because if any sensor goes bad and you overlook it, it may harm your vehicle’s engine. To check whether the upstream sensor has gone bad, you will have to look for signs such as messed up power output, gas mileage, engine performance, and Air/Fuel ratio. Likewise, detecting bad downstream o2 sensors can prove to be complicated because it can only be identified with code. The only sign you would see of a bad downstream is that it throws code. Which O2 Sensor Goes Bad First Upstream or Downstream?After our detailed discussion, a question that may arise in your mind is which sensor goes bad first. Now usually, it is said that the upstream sensor goes bad first. But if we talk in general, the main (upstream) o2 sensors go bad first from the crap that flows & burns through them (Gas). ConclusionThe ending line is, l always keep a check on both of the oxygen sensors because if any of these goes bad, your car’s exhaust will start smelling like rotten eggs. Eventually, it could affect the overall performance of your car in the long run. Related Article: How to Fix an Exhaust Manifold Leak Is there a difference in upstream and downstream oxygen sensor?The upstream sensor monitors the level of pollutants in the engine's exhaust and sends this information to the ECU that continuously adjusts the air-fuel ratio. The downstream sensor measures the level of pollutants passing through the catalytic converter.
Are Bank 1 and Bank 2 O2 sensors the same?Q: Are bank 1 and bank 2 sensors the same? Bank 1 and bank 2 have similar sensors. However, bank 1 has two sensors, of which sensor 1 is located near the engine before the catalytic converter, an upstream sensor called pre-CAT, and sensor 2 is located after the catalytic converter called post CAT, a downstream sensor.
Are all O2 sensors interchangeable?Are car oxygen sensors interchangeable? No, they most certainly are not.
Are both O2 sensors the same?Even though both O2 sensors are four wire, heated O2 sensors, there are definitely differences that the Motronic can detect. You must use the correct ones, whether oem with the correct length cable and plug, or the correct "universal" equivalent, that will require you to measure and splice your old plug onto it.
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Are upstream and downstream oxygen sensors interchangeable
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