Fault codes help

[NFIN02]

My a6 occasionally goes into limp mode with flashing coil light. When car is stopped and left a few minutes it appears to reset and go back to normal. I have scanned and found 2 faults - p200200 and p23700. Advice appreciated please

[Steve Q]

Any black smoke? If so could be a blocked dpf. 

Is there any lag or whine from the turbo? 

[Stevey Y]

22 hours ago, NFIN02 said:

My a6 occasionally goes into limp mode with flashing coil light. When car is stopped and left a few minutes it appears to reset and go back to normal. I have scanned and found 2 faults - p200200 and p23700. Advice appreciated please

Hi P2002 is the low pressure EGR cooler have a look on the site archives this is well documented the cooler gets blocked with adblue crystals and fails its a horror to replace its not the parts so much as the labour charges, the other one is the MAP sensor which is cheap and easy to change.