As above. It will reset it but fault will always comeback until it's mapped out. Very easy to do too
 
Do it yourself for the cost of an eBay cable and a bit of reading. 5 minute job. Could even get yourself a generic stage 1 map (with the EGR mapped out)
 
The car has already been mapped, I was told it was revo stage 1 so did the egr delete and exhaust mods so I could upgrade to stage 2 but the garage told me I don't have revo.

I wouldn't know where to start with getting a cable and doing it myself.

AL
 
The revo agent was going to upgrade me to stage 2 if he found stage 1 when he plugged it in but he didn't.

The previous owner told me it had revo and when I put it on rolling Road it made 196bhp and 314ft / lb torque, which ties in with revos figures so I just assumed it had.

It obviously has had a remap at some point.

AL