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5.0 Fault Codes 21,41,91
Im hoping someone can tell me what these codes are.
I have a 91 Mustang LX 5.0 Conv and I read the codes but I don't have a manual that tells what the codes are.
The Key On Engine Off code was 11, so thats okay.
When I do the Key On Engine Running test I get codes 21, 41, 91. Can someone let me know what the codes are and a possible fix for them pls.
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