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3-Series (E36) Chat relating to the BMW 3-Series from 1992-1999. Autodoodad Specific models include: BMW 316i, BMW 318i, BMW 318iS/ti, BMW 320, BMW 323, BMW 320, BMW 324, BMW 325, BMW 328.

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Old 03-05-2005, 02:56 PM   #1 (permalink)
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I went to autozone and got my check engine light read. tried searching but couldnt find it.

p0420
p0430

catalitic efficiency below threshold. can someone shed light on this for me.

Thanks
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Old 03-05-2005, 07:01 PM   #2 (permalink)
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you need a new post cat o2 sensor
or you need a new cat.

Start cheep and put a new o2 sensor in. Yes, they are a hundred bucks but these things do burn up sometimes.
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Old 03-05-2005, 07:25 PM   #3 (permalink)
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ok. i will try that, everything is running find, no black smoke etc.. so i will start out with the o2
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Old 03-06-2005, 12:16 PM   #4 (permalink)
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Hope it works out for you, you do have 2 O2 sensors, I'd start with the post cat, and if that dosn't fix it, fix the pre cat and if THAT dosn't do it, you are probably having an issue with your engine or the cat itself is bad.

It dosn't smell like rotten eggs does it?
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Old 03-06-2005, 05:55 PM   #5 (permalink)
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no- its smells and looks fine.. i probably wont get to it for a little bit, but i will post when i get it taken care of.
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Old 03-06-2005, 06:11 PM   #6 (permalink)
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yep, do the post O2 sensor. Same model number, shouldnt be any different than a pre cat O2 sensor, it's just where it screws into the pipe.
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Old 03-11-2005, 09:29 AM   #7 (permalink)
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does anyone make an o2 spoof for the bmw?
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Old 03-11-2005, 09:45 AM   #8 (permalink)
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Originally posted by Junior1683@Mar 11 2005, 08:29 AM
does anyone make an o2 spoof for the bmw?
[snapback]308776[/snapback]
o2 spoof?
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Old 03-11-2005, 10:02 AM   #9 (permalink)
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Quote:
Originally posted by k2c69n@Mar 5 2005, 04:56 PM
I went to autozone and got my check engine light read. tried searching but couldnt find it.

p0420
p0430

catalitic efficiency below threshold. can someone shed light on this for me.

Thanks
[snapback]304439[/snapback]
If I were going to replace just 2 02 sensors, I would put them before the cats. Those are the sensors that change the mixture going into the cats. The back sensors just do a double-check to see if everything is okay. If that doesn't work, you probably need new cats.
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Old 03-12-2005, 11:53 AM   #10 (permalink)
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yea o2 spoof..they have them for my 99 grand prix, it fits into the o2 spot makes the computer think a real o2 is in its place. a whole lot cheaper than a new o2..my spoof was $25 and a new 02 is 98.99

does the same thing. esp since the rear o2 doesnt set a code considering its not really monitoring the cat.
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Old 03-12-2005, 05:40 PM   #11 (permalink)
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Yah, a spoof is what you do to a 9 grand prix, not an engineered BMW.
O2 sensors are there for a reason, and there's a reason that if they fail, they throw the check engine light on.
Without the information from these sensors, the fuel\air mixture will be wrong and will result in poor gas mileage and poor proformance.
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Old 03-12-2005, 07:30 PM   #12 (permalink)
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just drop the $100 and get new ones.

www.rockauto.com has them for $100 each.

You will need 2 post cat
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