BOSCH 13477 Premium Original Equipment Oxygen Sensor - Compatible with Select BMW M5 X3 X5 Z3 Z4 Z8 320i 323Ci 323i 325Ci 325i 325xi 328Ci 328i 330Ci 330i 330xi 525i 528i 530i 540i 750iL 850i

oem brandfixed smoking exhuastshould replace all oxygen sensors after 100k miles for better fuel efficiency

Good value. As described. Worked for 2001 bmw 330ci.

Bought my car used with no records so I had no idea when these were changed. My car was not giving me any problems or codes but as preventative maintenance I decided to change them.It was quite easy but time consuming for me. The reason for this is I was using a Crows Foot (22mm) rather than an O2 sensor socket. If you decided to get an O2 sensor socket, make sure it is thick because if the O2 sensor is stuck on really hard then the socket may bend.The O2 sensor is located on the passenger side of the vehicle on the exhaust. Nothing needs to be removed to get to them. You can see one close to the positive cable nut (refer to picture) and the other near the secondary air pump, both along the side of the engine.Remove the wires that go to the O2 sensors from the brackets that are on the engine. Then disconnect one O2 sensor. Remove and install one at a time so you don't confuse the wires. Use a pick or a similar tool to remove the wires from the O2 sensors.My O2 sensor was stuck on really hard. I used PB Blaster to loosen the hold on both O2 sensors and let them sit for a day. Next day I went at it and it came off with ease. Only problem with using a Crows Foot is that you have to take it off at each turn. What makes it time consuming is that due to the wire, it will try to twist back into it's original position. My advice is to twist it with the Crows Foot, hold the O2 sensor with your spare hand and then reposition the Crows Foot on the O2 sensor and turn. Repeat. Keep doing this and it will eventually come off. Or you can just buy a good O2 sensor socket and get it off in less than 10 seconds.The new O2 sensor already comes with anti seize on the threads so you do not need to buy that. Leave the plastic caps on the thread on until you are ready to install so that you don't remove the anti seize.You need to push in while turning to get the sensor to thread in.

Works as described

Great replacement at fraction of cost of OEM part. Works just as good.

I have a late model BMW 5 series. If it's Bosch it going in my car. Listen to what I'm writing... I NEVER had any issues with Bosch products Zero!

I own a 2000 BMW 328Ci. The time came to replace the Pre Cat oxygen sensors. These have worked very well. A good decision over the generic brand names at much cheaper cost.

My mechanic installed them into a 2001 BMW 530i and the car immediately went into fits. 4 of the 6 cylinders misfired or did not work. The engine was starved of oxygen. The fuel was too rich. It caused so much trouble that I had to replace them with more expensive OEM oxygen sensors. Had I run it longer than a few days, I would have destroyed the engine. I think this is a manufacturing flaw. The Bosch sensors are not designed to do what Bosch claims them to do. I took it to another mechanic who diagnosed the problem and he replaced the new sensors with OEM sensor.