That's EGR aka exhaust gas return, which is fancy for saying it puts exhaust gases into the intake of the engine to reburn them, because they supposedly still have residual fuel in them that didnt get burned.
SOURCE: Car failed NY State safety inspection because the
THAT A NEW ONE ON ME.YOU HAVE TO HAVE CODES TO FAIL EMISSION TEST.NO CODES MEAN YOU PASSED.
SOURCE: My 1999 Mercury Sable failed
When I run search for p01252 and p15073 I got no hits codes do not exist. The p0401 is a good code and comely found it is for the EGR system (exhaust gas recycle) to do proper test all you need is a vacuum pump and volt meter. A scan tool would make it a lot easyer but most people don't have one. Do a visual check. The most common item is the DPFEGR sensor which should be replaced with the hoses.
The test to pinpoint the problem requier specal test equiment. Double check on the other 2 codes.
SOURCE: During a DMV inspection my vehicle failed because
P0401=EGR valve insufficient flow
P0700=transmission control system malfunction
P1739=transmission control module controller circuit
Get the EGR valve checked. It may be that a vacuum line is off. But worst case, say you need a new EGR valve. You can price one at autozone.com. Then find out what a shop would charge for labor to put it in. The transmission codes may be intermittant faults. If your car seems to be running fine, reset the codes and they may not come back until after your test, if ever. If the codes come right back, you'll have to take it to a transmission shop for check out. Any major auto parts store has a code reader that can reset your codes for free.
Just to be clear, have all your work done and then reset your codes. Then you will have to drive your car normally for a few days before taking your DMV inspection. There is a test they will run to see if enough drive cycles (a start, run, and shut down=one cycle) have been accomplished after a code reset. This prevents people from resetting the codes and immediately taking the test without any work being done.
SOURCE: 1999 mercury sable engine code
for p0401:
In fixing this code, it is quite common for people to just replace the EGR valve only to have the OBD code return. The EGR valve is not always the culprit.
Use a vacuum pump and pull the EGR valve open while monitoring engine RPM's & DPFE voltage. There should be a noticable difference in RPM's with the EGR open.
Clean out the EGR valve and/or tubing to remove deposits.
Check the voltage at the DPFE, compare to specified values (refer to a repair manual for your specific model).
Replace the DPFE sensor (with a good quality / OEM one).
Replace the EGR valve.
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