Fuel pressure is too high. (P0191) Fuel pressure is too high. (P0191) Possible cause: B4/15 (Fuel pressure sensor) Fuel system control unit Affected functions: Engine output Test 1: Signal wire PWM signal Fuel pump Test 2: Check component B4/15 (Fuel pressure sensor). 1. Signal wire PWM signal Fuel pump Figure legend 10.52SS Page 8712010 Mercedes Benz E 63 AMG Sedan (212.077) V86.3L (156.985) Copyright ? 2013, ALLDATA 10.52SS Page 872 A ConnectionTest cable 35pin socket box 001 Sockets of component N3/10 (MESFI [ME] control unit) 05 35pin socket box 050 126pin socket box 108 Test cable 266 589 01 63 00 N3/10 (MESFI [ME] control unit) II 163ConnectionTest cable III 64126ConnectionTest cable Warning! Connection A of test cable 108 may NOT be connected to connection B of the 126pin socket box (050). Test sequence Switch off ignition. Connect socket box (126pin) t...
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