Bank two is the passenger side. Sensor 2 is the one that is down stream(after)of the catalytic converter.
Single exhaust? Look before and after the converter. O2 sensors measure oxygen content before and after flow through the converter.answerThe oxygen sensor is a spark plug shaped device that is screwed into the exhaust manifold. Answer:There is one sensor located before the cat convertor. It will be a 3 wire sensor.
The Oxygen sensor that typically on MOST vehicles is the one closest to the heat of the exhaust. Since the SL1 is a 4 cylinder engine with a single exhaust manifold, check (or replace) the FRONT oxygen sensor, which is in the exhaust manifold, just above the "headpipe". It looks a little like a sparkplug, and should be the only thing in the exhaust manifold that has a wire connected.
If your car has the 2.5L 4 cylinder engine the crankshaft position sensor is located on the back side of the engine behind the ignition module which is below the intake manifold toward the rear of the engine. You can follow the spark plug wires to it. If your car has the 2.8L V6 the sensor is located on the back of the engine below the exhaust manifold. It has a single wire and is held in by a single screw. It is in about the center of the engine. The knock sensor is located nearby, but is screwed into the block and has pipe threads. By back of the engine I refer to the side next to the firewall.
They are before or after your precats depending on year and model. 91-93 have a single O2 sensor in the exhaust manifold, as they have no precats. I believe the 94-95 have 1 sensor before the precat, and one after to monitor the O2 in the exhaust gas. 96+ have 4 O2 sensors. Two before the precats, one on the front, one on the rear, while having two after the precats, on the front bank, and the rear bank. The precats are located after the exhaust manifold, directly before the downpipe.
The Oxygen sensor that typically on MOST vehicles is the one closest to the heat of the exhaust. Since the SL2 is a 4 cylinder engine with a single exhaust manifold, check (or replace) the FRONT oxygen sensor, which is in the exhaust manifold, just above the "headpipe". It looks a little like a sparkplug, and should be the only thing in the exhaust manifold that has a wire connected.
There are 4 oxygen sensors on the 2002 Avalanche, located on the exhaust pipes directly behind the engine. You'll have to put the truck on a rack or crawl under it to see them. Two are located on the left side of the exhaust system, with one on the engine side of the catalytic converter, and one just behind the converter. There are two more on the right side of the exhaust system in the same location: one before the catalytic converter, and one after. You'll be looking for a "tap", or an insert into your exhaust pipe, with a single wire coming out of it. The wire is connected to the oxygen sensor, which is screwed into the "tap".
coolant temperature sensor is the right of the coolant outlet line on the top of the engine when looking at while standing in front of the truck. it has a black two prong clip attached to the sensor. the oil temp switch is to the left of the coolant outlet line. it has a single black wire coming off of it.
Start at the exhaust manifold and follow the exhaust from the manifold rearward. You will find the O2 sensors. It may be mounted right on the manifold or somewhere on the exhaust pipe. Looks like a spark plug base with a single wire attached. Unhook the wire and use a boxed end wrench to unscrew & remove/replace the sensor.
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