Oxygen Sensors

I changed my downstream sensor by driving the car, 2000 Alero, onto ramps then I set the emergency break. I disconnected the battery to reset the computer before I removed the sensor. The sensor on this car was located on a short pipe between the converter and the muffler. I guess that there is a special socket to remove the sensor but I just grabbed the nut of the sensor with a pipe wrench, since I was replacing the sensor anyway. With the extra pulling power of the big wrench the sensor screwed right off. I carefully pulled the cable of the sensor away from the clips all the way up to the connector. The connector had a safety clip which pulled out, then the electrical connector is pulled apart by bending down the plastic side clip of the bottom connector. I replaced the new sensor using care not to break the wires. Then I worked backwards replacing the cable the same way that I removed the old one.

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Two. One before, and one after catalytic converter.

They produce oxygen during photosynthesis.

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Assuming this is a V6 or V8 engine, Bank 2 is the bank of cylinders on the passenger side of engine. Sensor 1 is threaded into the exhaust pipe between the passenger side of engine and the catalytic converter AKA upstream.

To clear out ignitable fuel vapors that could be in the engine compartment. If they are not cleared away, it could start a fire or explosion.

1995-1999 3.9L, 5.2L, and 5.9L Dodge Ram 1500 has two O2 sensors. One upstream (before cat) and one downstream (after cat).

On exhaust manifold opposite number 1 cylinder. First one in line(there will be one or two more convertor area behind)

Usually each side or bank has a sensor that monitors o2 in exhaust and adjusts run time on injectors, sensor 2 is usually behind convertor and may be shared by both sides, it monitors efficiency of catalytic convertor. I would replace sensor first since they are cheap and appears you have no problem with the ones controlling mixture. Only running excessively rich (raw fuel) will prematurely kill a convertor and under normal conditions they never wear out. Look more closely at that after you have ruled out sensor.

All O2 sensors are threaded into the exhaust system at various points.

They are threaded into the exhaust system, one before the catalytic converter and one after the catalytic converter.

On a 2009 Chevy Traverse, the oxygen sensor bank 2 sensor 1 is located on the exhaust system, specifically on the exhaust manifold or just downstream of it on the exhaust pipe. Bank 2 refers to the side of the engine that is opposite to bank 1, which is typically the side with the cylinder 1. To access it, you may need to lift the vehicle and work from underneath or remove some engine covers or components for better access.

Need to know which sensor, there are several.

Yes since car will go into limp mode, but if one fails completely, they usually throw a code

Bank 1 would be the passenger (right) side of engine. Bank 1 Sensor 2 would be the O2 sensor after the catalytic converter on the passenger side.

It has 2 (two) ..one upstream at collector on exhaust manifold and another downstream by catalytic convertor

Bank 1 and Bank 2 sensor 1 (upstream) are usually the same. Sometimes the only difference is the length of the wire harness. Same goes for sensor B1 S2 and B2 S2 (downstream). It really depends on the vehicle. Some vehicles call them air/fuel sensors and they are all the same.

You should have 3 on a v-6 since you have 2 banks.-2 different types. they monitor for O2 in exhaust and adjust injectors to suit. You should have 2 before convertor on exhaust pipes and 1 after. they are about 30.00 each and easy to change but you need a special socket and maybe a propane torch. The 2 before convertor the same, the one aft, a different type. If you have a code (MIL illuminated) it will tell you which one is bad or an advance scanner can see them switching back and forth, at least the ones that are working.

There is no maintenance interval since these are not routinely changed. if you have a bad one or one that's become lazy (slow switching) or very high miles or mil on with code you might change them. If you have a bad one upstream, you should do both, since other is usually right behind it. These are more important to the actual running of the engine since injector timing is based on what they read. The downstream or one behind the convertor I wouldn't worry about too much unless you actually get a code for it-all it does it monitor catylist (convertor function) Convertors never wear out-if your engine is running right. People only replace convertors if they get "killed" by a poorly running engine-raw fuel superheats the catylist and they fry. Important note-upstream and downstream sensors ARE different, although both upstreams will probably be the same part no. Buy the right one and the job is easier with the special O2 socket.

They can have problems related to corrosion because of the heat and the differences in metal between the exhaust system and the case metal on the sensor.