2002, 330i, 114K miles, oxygen sensors
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+1. I have the same car but with slightly lower mileage. (96k) how many o2 sensors are there and wheres the cheapest place to buy em? How's the install? As many BMW suspension/cooling systems that I've done, I've never changed an oxygen sensor LOL
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There are four O2 sensors. Two Pre-cat and two post-cat. The Pre-cat will affect MPG (via fuel and air ratio). Post-cat only for emmisons passing. Ensures that the post cat emissions are good. No affect on performance, unlikethe Pre-cats.
BMW OE O2 sensors are $200 each. BOSCH OEM are $65 each. DIY requires a speical O2 socket. you can do both in under an hour. They are standard and can be purcahsed at any auto store. There are two socket types. One is a crowfoot and the other a standard socket with a slit onthe side to accomodate the connected wire. It basically allows the socket to slip over the O2 sensor and let the wires hang out.
I replaced mine around 55K and I saw a noticeable improvement.
Also, do a search, as there are many lengthy threads on O2 sensors.
BMW OE O2 sensors are $200 each. BOSCH OEM are $65 each. DIY requires a speical O2 socket. you can do both in under an hour. They are standard and can be purcahsed at any auto store. There are two socket types. One is a crowfoot and the other a standard socket with a slit onthe side to accomodate the connected wire. It basically allows the socket to slip over the O2 sensor and let the wires hang out.
I replaced mine around 55K and I saw a noticeable improvement.
Also, do a search, as there are many lengthy threads on O2 sensors.
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I don't know what you are talking about. Just checked them and it was $132.00 for one O2 sensor and $109 for the other. How did you get both for $125 shipped?
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BOSCH are just as good as the OE "BMW stamped" O2 sensors. Here's my analysis of the differences (there are none, other than a detachable plastic BMW cuff):
http://forum.e46fanatics.com/showpost.php?p=12266703&postcount=23
Save $$$$$$$$ and get BOSCH.
http://forum.e46fanatics.com/showpost.php?p=12266703&postcount=23
Save $$$$$$$$ and get BOSCH.
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BTW, you can rent an O2 Socket tool @ Autozone for free (free is nice when it comes to BMWs!). You give them $25 and when you bring it back, you get your $25 back! Get the tool, it will help you infinitely when doing this.
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You know. I have you on my ignore list. I click "view post" to see if you are adding anything helpful to the thread. What a bag of douche.
Maybe different year = different part. mine were part # 13477. $66.68 ea. free shipping.
Glad to have you read my posts in between ignores. I hope you will throw some random parts at your car to stay a true fanatic.
What code? If it's a code for the post-cat sensors, there may be not be anything wrong with them. I believe there's a TSB out for 330s regarding this... search the forums.
what kind of "improvement" did you see?
i am of the frame of mind that if it ain't broke, don't fix it. especially when it costs more than $100. i still have the original 02 sensors at 160k+
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People say you really only need to replace the 2 pre-cat o2 sensors. The 2 post cat sensor are for monitoring and don't affect the performance unless it fails.
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