On Thu, 07 Feb 2008 17:03:08 GMT, "Jeff Strickland" <crwlr@[EMAIL PROTECTED]
>
wrote:
>The CODE tells you which sensor is flaky.
>
>There is a code for each Bank 1, Sensors 1 & 2, and for each, Bank 2,
>Sensors 1 & 2.
>
>Bank 1 Sensor 1 is the bank that contains exhaust from Cylinder 1, Bank 1
>Sensor 2 contains the exhaust from the other three cylinders. Bank 2,
Sensor
>1 is the CAT that has processed exhaust from the pipe that contains
exhaust
>from Cylinder 1, Bank 2, Sensor 2 is the CAT that contains exhaust from
the
>other three cylilnders.
>
>The CODE will tell you specifically which sensor is tossing up an error.
>Give us the Code you are getting, and we can tell you which sensor is
toast.
>
>You can extract the code(s) with a OBD II scan tool, there is no need for
>any specialized BMW tools. The OBD II data ****t lives along the bottom
edge
>of the dash board, either clearly visible OR hidden behind a small cover
>that is clearly marked -- I believe BMW puts the ****t behind a small
cover
>and marks it as the data ****t. (The OBD II spec. requires the data ****t
to
>be easy to find, so you do not need to spend more than about 5 seconds
>looking for it. Start your search near where your left leg rests while
you
>are driving.)
>
>The Code for the Bank 1 sensors can be MALFUNCTION, TOO RICH, or TOO
THIN,
>(3 separate codes, one for each condition) or a Code related to the
failure
>of a heater that lives inside of the sensor itself. I forget the Code
>options for the Bank 2 sensors, but they will translate to the CAT being
>ineffective. There is a chance the CAT is dead, but a far better chance
that
>the sensor is bad. I have never had a CAT go bad in all my years of
driving
>cars with CATs in them. That is not to say that a CAT can not fail
because
>they can, but it is rare and under normal cir***stances the
owner/operator
>of the vehicle has introduced fuel that is not suitable. (One must search
>out unsutiable fuel, so the odds of this are very low and the effect is
very
>rapid so you would remember the event it it occurred.)
>
>There can be multiple codes for any sensor, so a problem can percolate
>through the computer in different ways. If you have a code for Bank 1
Sensor
>1 and Bank 2 Sensor 2, odds favor only one of them being bad, and the
other
>re****ting an out of spec condition that comes from the first in the
stream
>not working right. If Bank 1 Sensor 1 mis-detects the fuel mixture, and
>adjusts the Fuel Injector Timing to cause more or less fule to be
delivered,
>the result can be that what flows past Bank 1 Sensor 2 is out of spec. In
>this instance Bank 1 Sensor 2 is okay, and only Bank 1 Sensor 1 is giving
>you trouble. If Bank 2 Sensor 1 (or Sensor 2) is throwing a fault in
>isolation, then the sensors at Bank 1, Sensor 1 and 2 are working okay
and
>do not need attention.
>
>Basically, replace the sensor closest to the engine (as the exhaust
flows)
>first to see if it resolves a false re****t from the next sensor
downstream.
>If the downstream sensor is throwing a code, but the upstream sensor is
not,
>then do not replace the upstream sensor.
Jeff,
Sorry for not snippin' any of your reply, but I didn't want to miss
quote anything.
I think I followed most of what you wrote except for the second
paragraph about Bank/sensor/cylinder relation****p. It appears to me that
you
are talkin' about a 4 cylinder (318) rather than the 6 in my 328. Am I
correct
or have I misunderstood?
If it's any help the codes it's throwin' are as follows:
233 = Cat. sys efficiency Bank 1
202 = Lambda control stop Bank 1
203 = Lambda control stop Bank 2
234 = Cat. sys efficiency Bank 2
I appreciate all of you folks quick replies, help, & training. Thank
You!
-
Jinks ('86FXRS, '07 FLTR)
#64
Remember, "No good deed goes unpunished"
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