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No start code 78 - 2001 Volvo S40

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Trying to start my car I put the jump leads on the wrong way round. Now I have no power even with the jump leads on. What have I done?

You opened up 2 fuses, its located in the engine fuse junction box listed as # 71, # 78, the 71 is a 10amp fuse the 78 is a 15 amp fuse,this will restore you.

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Ram 1500 4x4 has abs and brake lights on computer says error code is 78. what can be the fix?

replace the brake pressure switch, this switch is located on the master i think, code 78 is brake foundation, the computer sees brake pressure switch feedback voltage low, this can be caused by a leak , so the pedal would sit low or sink or a bad connection to switch or switch itself, also make sure brake fluid is full. good day

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On a 1994 gmc suburban recieving code 78

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460 78 model will not staart

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