200tq check engine light, but no codes!?

[Ivan Tuma]

Ti,

This one does have permanent memory (MC-14 I believe). It still had 
codes stored in there from last years troubles.... but I will try your 
technique tomorrow as well.
It feels just like what is always described as knock sensor trouble 
(embarrased myself against a Mazda 6 today because the hesitation kicked 
in just when I really
didn't need it ;-).

I know what you're talking about though ... I use to have a few '84 and 
'85 turbos with this type of system.

Thanks.

Ti Kan wrote:

>I don't think your car's ECU (MC-2 engine) has permanent fault
>memory.  If the ignition is shut off, any recorded fault is gone.
>So, to catch the fault, you should do your blink code check after
>you encounter the check engine light, but before shutting off the
>car.
>
>-Ti
>2003 A4 1.8T multitronic
>2001 S4 biturbo 6-sp
>1984 5000S turbo
>1980 4000 2.0 5-sp
>  
>