Catalytic converter & Temp sender.
 

Hi,

I've been told that the Catalytic converter on my Audi A4 Avant (1999)
1.8 Auto has failed because of the temperature sensor failing. The cat
failure must be bad, becuse the engine will only get the car to 30-40
MPH! I'm not convinced that it is the cat.

I was always told that the engine management system had a seperate
engine temp monitor. The sensor that has failed is the sensor for the
temp gauge on the instrument panel.

I've been told that because of the sensor failure, the engine has been
running permanently rich, which in turn has killed the cat.

Does this make sense?

Thanks
Dave

Re: Catalytic converter & Temp sender.
 

When the Cat breaks up it partially blocks the exhaust and strangles the
engine.
Had the same problem on a Mondeo a while back.
Rgds
Alec
"Dave Farrell" <davef@despammed.com> wrote in message
news:db75800f.0404070729.4f3964ff@posting.google.c om...
> Hi,
>
> I've been told that the Catalytic converter on my Audi A4 Avant (1999)
> 1.8 Auto has failed because of the temperature sensor failing. The cat
> failure must be bad, becuse the engine will only get the car to 30-40
> MPH! I'm not convinced that it is the cat.
>
> I was always told that the engine management system had a seperate
> engine temp monitor. The sensor that has failed is the sensor for the
> temp gauge on the instrument panel.
>
> I've been told that because of the sensor failure, the engine has been
> running permanently rich, which in turn has killed the cat.
>
> Does this make sense?
>
> Thanks
> Dave

Re: Catalytic converter & Temp sender.
 

Dave Farrell wrote:
> Hi,
>
> I've been told that the Catalytic converter on my Audi A4 Avant (1999)
> 1.8 Auto has failed because of the temperature sensor failing. The cat
> failure must be bad, becuse the engine will only get the car to 30-40
> MPH! I'm not convinced that it is the cat.
>
> I was always told that the engine management system had a seperate
> engine temp monitor. The sensor that has failed is the sensor for the
> temp gauge on the instrument panel.
>
> I've been told that because of the sensor failure, the engine has been
> running permanently rich, which in turn has killed the cat.
>
> Does this make sense?

The temp gauge sensor is the same one the engine management system uses,
although I thought it had a seperate element for it. If it was running
rich it could indeed damage your cat and restrict the exhaust.