[V8] Code 2341 - disconnected OXS, still rough, plus exhaust hissing

Ron Wainwright ron_01056 at yahoo.com
Wed Feb 4 03:55:11 PST 2009


That is absolutley correct on all accounts!!!!

 When I put my 4 wire 02 in I got the extra ground on the back of the d-side motor. Rite were the ECU gets it's ground under & to the side of the cruise bracket & coolant cross over pipe.


--- On Tue, 2/3/09, urq <urq at pacbell.net> wrote:

> From: urq <urq at pacbell.net>
> Subject: Re: [V8] Code 2341 - disconnected OXS, still rough, plus exhaust hissing
> To: "'Audi V8Q Mailing list'" <v8 at audifans.com>
> Date: Tuesday, February 3, 2009, 11:27 PM
> If so, why didn't things pick up when the OXS is
> disconnected?  The OXS or
> FPR may indeed be (or have been) bad, but if so, the
> exhaust hissing
> indicates that the extra rich exhaust caused damage to the
> cats.  
> 
> I must say that I don't think it is wise to recommend
> connecting the ground
> for the 4-wire OXS to anything other than the engine block.
>  If things get
> better at all after grounding to the car body you must have
> had a really bad
> OXS.  By connecting the ground of the OXS to the body of
> the car you are
> guaranteeing that the ECU will get a signal which is
> affected by
> battery/alternator load.  People seem to think that
> there's such a bad
> connection between the crossover pipe and the engine block
> that a good
> connection to the shiny ground on the body of the car *has*
> got to be better
> ... but since the OXS current is very small the resistance
> is less of an
> issue.  
> 
> If you look at the wiring diagram for the PT/ABH and focus
> on how the ground
> wires are arranged between the ECU and the engine, the
> grounding was
> designed specifically to provide a reference for the
> sending units which is
> not affected by the current induced voltage changes on the
> circuits for the
> output devices (injectors, ignition coils, solenoids).  By
> connecting the
> OXS ground as you have the reference for the OXS signal is
> having to pass
> through the high current ground braid that goes from the
> body of the car to
> the engine block.  
> 
> There are at least two bolts on the back of the engine
> which were intended
> for providing a proper reference.  It is perfectly
> acceptable to recommend
> someone use a 4-wire OXS, but for anyone who chooses to do
> so, look for
> these points on the engine and figure out a way to connect
> the OXS ground
> wire to one of these points.  
> 
> Steve B
> San Jose, CA (USA)
> 
> -----Original Message-----
> 
> 
> I'm gonna go with you just got a bad O2 Sensor, and
> when you replace it 
> You should use a 4wire unit, Run the extra ground that you
> have on the 
> 4wire one up to the drivers strut tower and ground it with
> the rad fan. 
> 
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