Question

For the Ford F250, Can you please tell me what the possible solution is for the P0087, P0703
Thank You

Answer 1

P0087 Fuel rail /system pressure too low

P0703 Brake switch "B" input circuit

When fuel rail pressure sensor circuit is low, you need to replace the fuel rail sensor.The PCM uses this sensor input to adjust fuel pressure, This sensor affects the fuel pump performance, so doing a fuel pressure test first will be invalid. Unless you put a known working pressure sensor on first then take a fuel pressure test. This will determine if the fuel pump is  putting the correct pressure. P0703 is a KOER (key on engine running) test where the brake was not applied during the test.(KOER). If you did not do a KOER test and this code is on scan tool code reader, Check and inspect the brake switch and operation of the brake light especially the middle brake light.