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Old 12-07-2012, 12:42 PM   #1
jec323i
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Exclamation looking for some seasoned advice :cel help p1183 replaced o2 sensors to no avail

hi I'm looking for help with some issues with my 2000 323i. I have researched extensively in search of an answer and was just hoping for some help or advice.

scan tool indicates code p1183etc all fuel/emissions related. I replaced the o2 sensors with no luck. need to get this fixed to pass inspection. I have read about all the possible vacuum leaks and ground issues. the car starts and runs normally and smoothly however the cel has been on pretty much since I bought the car in 05. I have also replaced the fuel pump gas cap and fuel filter. obvious things like fuses have all been checked.

symptoms/possible indicators

various electrical gremlins

condensation on windshield from deteriated cowl seal (didn't know if this was relevant to a possible dme malfunction from moisture possibly getting to it)
radio would not work for some time but is operating fine now ( again moisture?)

burns up high beam bulbs ( I used nitrile gloves)

I have always noticed the voltage seems to surge slightly with rpm I assume this is normal ( headlights getting slightly brighter etc) I added a larger peice of amplifier power wire to the existing connection between the under the hood positive terminal and alternator connection as a shot in the dark recommendation from a friend. also an aftermarket voltage regulator at the battery connection)
also under hard acceleration the engine seems to "surge"" and wane ever so slightly as rpm rises ( maybe normal operation of the vanos system?)
any help would be greatly appreciated
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Old 12-07-2012, 06:56 PM   #2
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Just curious if you actually went in after the repair and cleared the code? It will not clear itself. Let me know and we can go from there.

Also, which O2 sensors did you replace?
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Old 12-09-2012, 06:12 AM   #3
jec323i
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yeah cleared the codes repeatedly after different attempts. and replaced sensors on bank 2 sensor 1 & 2
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Old 12-09-2012, 06:18 AM   #4
jec323i
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I wonder if it could be in the o2 sensor wire
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Old 12-10-2012, 06:30 PM   #5
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You confused me, the O2's before or after the cats?
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Old 12-12-2012, 06:34 PM   #6
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after
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Old 12-12-2012, 06:37 PM   #7
jec323i
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I'm thinking it also could be a bad ground considering all the electrical issues
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Old 12-12-2012, 06:41 PM   #8
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Quote:
Originally Posted by jec323i View Post
after
You are confusing the crap out of me!

You said you replaced bank 2 sensors 1 and 2. This is a sensor before and a sensor after the CAT. Replacing the sensor before the CAT was a waste of money. If you used sensors that are spliced into the vehicle wiring, then you have bad splices. If you don't know the difference in Bank 1 and Bank 2, then you probably did not replace the right sensor anyhow, and this will cause the light to remain on, and the code to keep coming up.

HINT
Spliced O2 Sensors almost never work out well.

Last edited by jdstrickland; 12-12-2012 at 06:43 PM.
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Old 12-27-2012, 09:31 AM   #9
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Ok I replaced both sensors with oem Bosch replacements direct plug in. I do know the difference between bank 1&2 .
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Old 12-27-2012, 11:06 AM   #10
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Car had 4 sensors, 2 you can reach under the hood and 2 you can reach under the car.

Bank 1 = Cylinders #1-#3
Bank 2 = Cylinders #4-#6

The references are:
Bank 1, sensor A (also sometimes noted as sensor #1) = front engine sensor under the hood for cylinders #1-#3.
Bank 1, sensor B (also sometimes noted as sensor #2) = sensor under the car for, post catalytic converter for cylinders #1-#3.

Hopefully you replaced the sensors under your car??

The under car sensors only test the catalytic converter efficiency and help clear the Emission Readiness Monitors but they have heater circuits that fail in them and cause this code sometimes.

P1183 is Bank is Bank 2, Sensor B or 2 meaning the post catalytic sensor for cylinders #4-#6 or the rear exhaust manifold.

What other codes do you have?
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Old 04-09-2013, 10:51 AM   #11
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started off replacing the 2 sensors under the car. didn't fix it. replaced intake boot didn't fix it. replaced the other 2 o2 sensors. still didn't fix it . checked the wires. they look good. if I erase the codes they stay off until I restart the car. all Bosch oem replacements. now I'm wondering if it could be a disa valve? maf? or even cat? any ideas?
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Old 04-09-2013, 10:54 AM   #12
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can't remember all the codes right off but they were all o2 related. heater circuit malfunction, something about coast down fuel cutoff ?
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