There is no "EGR light". I assume you mean the MIL (Check Engine Light) was on, and it had a stored EGR related DTC, probably an insufficient flow code?
Are the insides of your tailpipes sooty? You likely have a cracked DPF, which allowed soot to pass through and eventually clogged up the low pressure EGR filter tube. This is (was?) common. There was a TSB about it. Water under the bridge post Dieselgate.
You have a couple options.
1: Buy a new DPF, and a new EGR tube, and install it and motor on. It will likely some day happen again, but it may take a while. You cannot buy the old style EGR tube, as the Fix employs a new one with no filter can. This sucks, because now when the DPFs crack, the soot will go straight into the air inlet tract into the turbocharger. I cannot imagine this is something that will be good over time. You can try cleaning the existing tube, by soaking it in some caustic cleaning agents. I have done that a couple times. I also still have a new-in-box one if you want to buy it cheap, as I will likely never need it.
2: try and have the Fix applied to your car, but the dumb thing is, they'll only do the Fix if there is nothing "broken" on the car, even if the thing that is broken will be getting replaced and/or will be warranted as part of said Fix. This of course means your car may not operate as well as it does now, and you may find that MIL on repeatedly and you will get to know all the service writers at your local dealership on a first name basis. Lots of my customers end up ping-ponging back and forth like this.
3: if you can circumvent any local laws or checks, delete the whole mess and enjoy a slightly more smelly (at the tailpipe) yet more efficient and faster car that won't give you any of these headaches ever again. Know that this IS technically illegal (Federal law prohibits any tampering with any emission control devices, no matter if any local checks exist).
4: keep driving it as it is. Eventually, the soot passing through the cracked DPF will clog up the catalyst, and you'll lose power and potentially harm the engine and/or turbocharger.