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will fixing the 1406 error also correct a speedometer that is not working on a 2003 e150 ford van?

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will fixing the 1406 error (defferential pressure feedback sensor downstream hose) also fix a speedometer that is not working?

Vehicle: 2003 ford e150 van

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No it will not, P1406 is for the EGR. What effects the speedometer is the speed sensor that is located on the top rear differential,This sensor also double up as ABS sensor

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