Same thing happened to me couple of years back.. the service center pressure washed the engine bay but I stopped him immediately. At that time i didn't notice much except for some wired noises which went away after couple of minutes. But the sad thing was my tachometer stopped working the next day. And the speedometer was playing havoc as well. I doubt it might have shot a couple of sensors and messed up a fuse or something.. Eventually I replaced the coil pack, cam sensor, crank sensor, plugs etc