Buick Repair Questions? Ask a Mechanic for Answers ASAP
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P0440 is an EVAP system problem, possibly a leak. The C0040 is a wheel speed sensor or circuitry problem.
I can get the instructions for it and put it in a PDF file, (it is rather large) and send it to your email address for as little as possible.
You will just have to accept the additional service offer and ENTER your email address in the “ENTER CONTACT INFO” section so that I can see it, Thanks
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