DiagBuddy We are currently building a completely new version of the DiagBuddy Site. MAF Calculator This calculator will provide a theoretical Mass Air Flow for the entered parameters. Horse Power Calculator This calculator will provide a theoretical Horse Power for the entered parameters. Fuse Volt Drop This little calculator is handy when measuring parasitic battery drains using Fuse Volt Drop method. Ford In / Out Codes Ford In / Out code calculator for single and dual codes. (Please Note: this calculator does not work with the newer algorithm) Renault Radio Codes Free Renault Radio Code from serial number. PSA Build Code Enter a PSA ORGA / ROP build code to get the build date or enter build date to get the code.