There is a certain amount of bending of the pipe that runs toward the back of the car necessary - not much but a couple mms. You probably need to squirt the joint with a penetrant oil and let it soak. (You DID remove/loosen the single bolt securing the EGR valve to the engine I presume). I get the dreaded P0400 code about every six months and its a ***** getting the pipe off each time. It binds. Maybe there IS a secret. Also, FYI, I can only get the rotorooter to go in 20" but it cures it so I guess that's the blockage. I used a piece of wire rope with the end soldered (so it doesn't fray) chucked in my low speed drill - gotta run it in reverse to keep the rope from unraveling. HTH,
RIP "Betsy" (Oo=*=oO)
'96 E 3 2 0 (W 2 1 0) M 1 0 4 (Totalled)
Spaces in sig so as not to screw up the SEARCH; every time someone searches for that MB they don't want my sig!
2004 Audi A8L
'98 VW Passat 1.8T 5M
'87 Alfa Romeo Milano 2.5L 5M
'67 Impala convertible, 327cid