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Discussion Starter · #1 · (Edited)
Hello,

I bought some pre-cat oxygen sensors however the cord was too short.


and when I was trying to change it, I notice that mine are more like this


and I'm talking about the ones that are under the hood, which I'm correct is the pre-cat oxygen

Just want to make sure that this is the right ones for a 2003 325i

I look up in real OEM
and parts numbers are

11787523434
11787523435

http://www.realoem.com/bmw/showparts.do?model=ET37&mospid=47720&btnr=11_3555&hg=11&fg=50&hl=2


Now my question is. I wasn't able to remove the current ones from the car so I wasn't able to see the way the tips look. As you can see from the pics above, the tips or head looks different in both of them. How do I know which one mine currently is. I don't want to buy the incorrect product again. Also what is the cheapest place to buy? In http://www.bmaparts.com is about $100 per each coming to a total of $200 plus tax. Are Bosch pre-cat sensors that expensive?

Thanks

Wick
 

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Discussion Starter · #3 ·
been doing a research and that's how I bought the ones I bought and they were wrong. Anyone have any clue on which ones to buy?
 

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didn't you run the real oem number thru ecs? if you didn't it's your fault

u need part numbers 1 and 2 in that pic, there is no reason to see the heads of the old ones, it's pretty simple actually
 
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