Hi, I have had a very strange thing happen to my newly acquired 91 200 20 valve. It suddenly sprayed all of it's fluid (Penosin) out of the top of the reservoir cap ( sensor). Obviously, maybe not so obvious... I cannot drive the car this way. Could it just be a failed cap? I had no idea there was so much pressure under this cap! Any other ideas? Thanks in advance for your input... Ron Husak