Flight Crew Instrument; Flight Crew Air Transport Pilot (ATP); Flight Crew Multiengine
Distraction; Situational Awareness; Confusion
Deviation / Discrepancy - Procedural Clearance; Ground Event / Encounter Ground Equipment Issue; Ground Incursion Taxiway
Air Traffic Control Issued New Clearance; Air Traffic Control Provided Assistance; Flight Crew Became Reoriented
Chart Or Publication; Airport; ATC Equipment / Nav Facility / Buildings; Environment - Non Weather Related; Human Factors
Landed 27L; exited on Y1. Directed to taxi on D4; then left on Bravo; then right to Mike. Delta taxiway is before Bravo and parallels it. We turned on Delta erroneously and was corrected by ground who gave us alternate taxi back instructions to turn right on MD-1; then MD-2 to Mike. No other implications noted.Signage was a factor and I misprioritized my tasks by completing after landing check before getting on long taxiway.
After landing we exited 27L on taxiway Y1.  We were given instructions to taxi left on D1; left on B; and then right on M to spot M.  Instead of turning left on B; we turned left early on D.  ATC caught the error at the same time we did and we received new taxi instructions to spot M.  There was no conflict with other aircraft traffic.  Bad crew situational awareness; bad signage in LFPG; language barrier.  More situational awareness on the part of the crew.   Better signage in LFPG.
A Flight Crew reported a taxiway incursion due to poor signage.