MIL is on

There also have been cases where coolant seeped out of the temp sender seal
and corroded the pins on the connector causing erronious readings. not
enough leaked to cause a leaking problem.

"dave AKA vwdoc1" > wrote in message
...
> http://tech.bentleypublishers.com/th...readID=237 37
> go there and read......quite a few problems can cause this light to go on.
>
> I have heard that the following could cause this:
> CTS (need a green one and test it with the vag-com tool while the engine
> heats up)
> Thermostat
> Water pump
> Coolant mixture might need more water than coolant
> fans
>
> Something might telling the ECM that the temperature is not getting hot
> enough quickly enough or maybe too hot.
>
> "Jim Behning" > wrote in
> message ...
>> On Sat, 14 Mar 2009 14:22:17 -0400, Dakkel Lateg >
>> wrote:
>>
>>>On Tue, 10 Mar 2009 18:59:30 -0500, "dave AKA vwdoc1"
> wrote:
>>>
>>>>
>>>>>>>>The question is would a malfunction thermostat causes the MIL light
>>>>>>>>to
>>>>>>>>come on?
>>>>
>>>>Yes I think I have seen a light come on due to a faulty thermostat.
>>>>
>>>>See if these codes have popped up.
>>>>16512
>>>>P0128
>>>>Coolant Thermostat/Valve Temperature below control range
>>>
>>>The code is P2181.
>>>
>>>What effect does a "temperature below control range" have on the
>>>performance of the engine?
>> First guess is the engine thinks it is cold. It runs a richer mixture.
>> Catalytic onverter eventually burns up because of excessively rich
>> mixture.
>
>