Increased emissions light

This normally means that there is a misfire or there is an issue with the exhaust system.

We need to start with checking for codes. Here is a guide that will help with this:

https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing

Once we know what codes are there, we will be able to better know what the possible causes are. However, as I stated the normal cause is a misfire so here is a guide that covers what we need to do to start with this unless there is a code pointing in a different direction.

https://www.2carpros.com/articles/engine-misfires-or-runs-rough

Lastly here is a guide that covers the general info on the emission system to help explain what may be the issue:

https://www.2carpros.com/articles/how-emission-control-systems-work

Let me know what questions you have. Thanks