check engine light on after battery change on 2003 Volkswagen Beetle

Enthusiast 01be16a5a93688912f14755221fb15211b518d9a788cf01b455e03cc1bd585ac
After I changed my battery the check engine light came on, What could be the cause of this?
(1) Answer
re check your work and make sure you did not leave anything un connected. it sounds like you left off a connector for a sensor.