1999 Jetta P0440 p0422

My daughter has 1999 Jetta
I've replace the 02 sensor after the cat twice
each time it put the check engine light out
then the light would come on when it got wet
I would erase the code and it would come back again when it got wet
now the car has a loss of power when cold and the light is on again
and it is setting P)715 and p0303 in addition to the other codes
I have replaced the speed sensor once before
I'm thinking I need to replace the catalitic converta next
the car has well over 200000 miles
Is there a way to check the catalitic converta or should I take a chance and just replace it?
Thanks for any help you can give me

http://wiki.ross-tech.com/index.php/16824/P0440/001088
http://wiki.ross-tech.com/index.php/16806/P0422/001058
http://wiki.ross-tech.com/index.php/16687/P0303/000771
The P0440 is related to P0303. I would fix P0303 before doing any of the other services. This code is more than likely the # 3 ignition coil pack. If your coil pack has a unseen crack, when it rains moister finds it's way into the pack and causes problems until it dries out.

http://wiki.ross-tech.com/index.php/16824/P0440/001088
http://wiki.ross-tech.com/index.php/16806/P0422/001058
http://wiki.ross-tech.com/index.php/16687/P0303/000771
The P0440 is related to P0303. I would fix P0303 before doing any of the other services. This code is more than likely the # 3 ignition coil pack. If your coil pack has a unseen crack, when it rains moister finds it's way into the pack and causes problems until it dries out.


I have a 1999 new body jetta too and I think I have a similiar problem to his daughter car...My check engine light come on and off every now and then but I can't seem to find the problem to that light. and also my abs light too.
I can twice already and I can't find anything wrong with it.
do you know why it happen?
thank you

If you could tell me more about your episodes. Check engine light numbers and drivability. Your ABS light could be related to your brake light switch malfunctioning, ABS begining to fail or brake fliud temp to high from not having it changed regularly.
Franco