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E46 (1999 - 2006)
The fourth generation 3 Series (E46 chassis) was introduced in 1999 and set the standard for engineering and performance during it's years of production including being named to Car & Driver's 10 best list every one of those years! ! -- View the E46 Wiki

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  #1  
Old 06-02-2020, 11:37 PM
StevenE46 StevenE46 is offline
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Any input is appreciated

I have a 2000 330i e46 just got back from the shop and they quoted me $1300 for all o2 sensors to be replaced. Figured I'd save money and do it my self. So I started replacing my pre cat sensors and found that there's no sensors there at all. There's nothing to be plugged into either. It's all missing
Can someone please tell me what this means? What's my next step? Take it to the mechanics ?
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  #2  
Old 06-03-2020, 12:04 AM
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lgr122 lgr122 is offline
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How long you had this car? You have headers installed? Can't see 100% sure from picture. So you get O2 sensor codes because they are not there?
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Old 06-03-2020, 12:13 AM
StevenE46 StevenE46 is offline
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Originally Posted by lgr122 View Post
How long you had this car? You have headers installed? Can't see 100% sure from picture. So you get O2 sensor codes because they are not there?
Hi I just bought the car about a month ago, The infamous p0174 and p0171 codes came up, the engine is running lean with a 27.3% fuel trim.
I checked for vacuum leaks and couldn't find any so i decided to take it to a shop and they said it was the o2 sensors.
Sorry about the pictures I'm not sure where else to take them. In all the YouTube videos they get replaced there but my car doesn't have the harness' and where the old sensors would be.
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Old 06-03-2020, 04:25 AM
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lgr122 lgr122 is offline
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Basically there's reason to believe your car doesn't have stock exhaust? So those sensors might be located in different place? Did that shop actually look at your exhaust? Or just read codes?

Does it run well? So you can look and think carefully what to do next?
Eitherway I won't suggest paying that 1300$, I'm sure there's cheaper way around.
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Last edited by lgr122; 06-03-2020 at 06:21 AM.
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Old 06-03-2020, 10:04 PM
protocol1 protocol1 is offline
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Unless you moved it out of the way, looks like the Secondary Air pump is missing also......

If the O2 sensors where removed, there should be/are plugs in the threaded holes for the O2 sensors pre and post cat. The O2 sensor wiring is a subsection of the main engine wiring harness IIRC.

Last edited by protocol1; 06-03-2020 at 10:08 PM.
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Old 06-03-2020, 10:07 PM
StevenE46 StevenE46 is offline
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Unless you moved it out of the way, looks like the Secondary Air pump is missing also......
Yeah took it out for the photo
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Old 06-04-2020, 07:38 PM
MoparJim MoparJim is offline
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Where are you located? I suggest that you find somebody nearby who knows more about these cars than the shop you took it likely does.
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Old 06-04-2020, 07:48 PM
alpinweiss alpinweiss is offline
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Quote:
Originally Posted by StevenE46 View Post
Hi I just bought the car about a month ago, The infamous p0174 and p0171 codes came up, the engine is running lean with a 27.3% fuel trim.
I checked for vacuum leaks and couldn't find any so i decided to take it to a shop and they said it was the o2 sensors....
It sounds like somebody sold you a car that is not emissions-compliant. Depending on where you are located, that could be illegal. The dealer from where you bought the car may have some legal liability. This is not just a routine failed sensor; this is intentional removal.

You may want to check your local laws before proceeding.

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