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5-Series (E12,E28, E34, E39, E60) Chat relating to the BMW 5-Series of all generations. Specific models include: BMW 518, BMW 520, BMW 520i, BMW 530i, BMW 528i, BMW 530i, BMW 518i, BMW 524d, BMW 525i, BMW 525e, BMW 528e, BMW 540i, BMW 535i, BMW 520d, BMW 525td, BMW 525d, BMW 530d, BMW 525i/xi, BMW 530i/xi. (BMW 5-Series Forum)

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Old 03-22-2009, 05:54 PM   #1 (permalink)
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o2 sensors

Hey guys, its been a while...

I finally had my cracked head repaired and the car is still showing problems. The idle is horrible and the pcv valve and hose were changed. The check engine light is on, so I pulled the codes, and it says half my cylinders are misfiring, and something about banks 1 and 2. On top of all this, my fuel consumption right now is a joke. This thing is literally drinking gas. My mechanic says it must be the o2 sensors must have gone bad, and quoted a price of $320 to replace them. I did some online research and figured that this is a DIY job. The only thing is, I cant seem to locate where the o2 sensors are. Can someone steer me in the right direction? (the use of pictures would be great here) Also if anyone has an opinions as to what proactive steps I can take next, I'd highly appreciate it.

1997 528i
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Old 03-22-2009, 11:19 PM   #2 (permalink)
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If I'm not mistaken, at least on of your sensors is located on the exhaust pipe, just ahead of the catalytic convertor. I don't know if the other one is simply on the other line.
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Old 03-23-2009, 10:35 AM   #3 (permalink)
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They are both on the exhaust system upfront you cant really miss them as the have wiring attatched to them, yes it is a deffo DIY job, but get the correct sized spanner.

After changing them if its still playing up I would be looking at the MAF.
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Old 03-24-2009, 02:53 AM   #4 (permalink)
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hmm

hmmm, question: I thought there were 4 o2 sensors. 2 in the back (post cats) and 2 in the front (pre cats). I think the post cats are in the exhaust if im not mistaken, and the pre's are somewhere near the engine. How do I know which ones I need to change. And it's the one's that are presumably near the engine that I am in search of.
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Old 03-24-2009, 07:27 AM   #5 (permalink)
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I can only find 2 on you car # 9 x2 in the diagram, as #5 is not listed its not on your car unless Ive put in the wrong details:

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