I have a P0112 engine code on but need to smog my Jetta for registrations

If that code is turning the Check Engine warning light on, then your only choice is to replace the faulty part. California's Smog Check program is designed to prevent you from - for example - clearing the fault code and then going to a Smog Check station to get a Smog Check before the light can come back on again. So, yes, you need to fix it. - Nate Smith Nate Smith Optimal Auto Care

Fix the car and be done with it! .. Depending on production date, It's 15 years old .. Sometimes you got to spend a little money.. You'll wind up spending more just 'trying' to get by than actually fixing it! http://www.autocodes.com/p0112_volkswagen.html