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7 Series - E38 (1995 - 2001)

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  #1  
Old 07-23-2010, 12:49 PM
M7 M7 is offline
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How to DIY O2 sensors?

Hey i must change my o2 sensors how easy is this? (both).

Is there anyone that knows about the o2 sensors?
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  #2  
Old 07-23-2010, 03:50 PM
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FABOCH FABOCH is offline
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Quote:
Originally Posted by M7 View Post
Hey i must change my o2 sensors how easy is this? (both).

Is there anyone that knows about the o2 sensors?
Which o2 sensors must be replaced?
95-98 have 2 o2 sensors while the 99-01 have 4...2 pre and 2 post cat o2 sensors
The 2 pre cat o2 sensors are lil tuff to get to while the 2 post cat o2 sensors r really easy...Most likely the 2 pre o2 sensors need to be replaced as they r usually the 1st to go
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Last edited by FABOCH; 07-23-2010 at 03:51 PM.
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  #3  
Old 07-23-2010, 05:16 PM
M7 M7 is offline
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1999 bmw 740il i'm not sure which ones i'd like to do all of them. How much would that cost to install?
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Old 07-24-2010, 03:37 PM
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FABOCH FABOCH is offline
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Originally Posted by M7 View Post
1999 bmw 740il i'm not sure which ones i'd like to do all of them. How much would that cost to install?
doing it yourself is rather easy....make sure u get a lift or have the car up on jack stands for safety.....Autozone sells the o2 sensors for around $60 each....$240 plus tax what I see...is it worth it to pay someone to do it? maybe but all depends on u...
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Old 07-24-2010, 04:38 PM
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I'm pretty sure that all cars made after 1996, have pre, and post catalytic converter O2 sensors. Since these cars have dual exhaust, all E38s have a total of 4 O2 sensors. I know for sure that my 97 has four. The ones before the cat talk to the computer to adjust the air/fuel mixture, and the ones after the cat just tell the computer if the cat is working.

The universal O2s will have 4 wires that you need to splice and connect to existing wires from the harness of the previous O2s. The job is not hard but you should be careful while unscrewing the old ones, as the threads on the exhaust sometimes come out with them. Spray them with penetrating fluid and use the correct tool to take them off.
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