yesterday my service engine light came on so i had it scaned and this is what i got
i got a p6402 which pepboys said was a egr valve overflow, or egr valve staying open
I dont know this means

also i had my abs light so they check it and i got 4

i got c1230 which was speed sensor circut fault

c1237 which was rear wheel speed input signal missing

c1229 which was rear speed sensor fault

c1224 which is brake warning lamp ground missing

im pretty sure the first 3 are one problem dealing with rear speed sensor missing but not sure


so could someone help me out

 

Vehicle year, engine etc makes it easier to diagnose.


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99 f150 4.6 v8