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Online decoders lack the necessary if/then as well as either/or logic to prevent errors. They are in = out decoders i.e. pre programmed to respond to an input whether that output is logical or not (see below for engine and transmission as well as SPD) Make and model specific decoders such as...

Yes... and some people spend an inordinate amount of their lives continuing to research all the nuances and document 'how things were done' with tags and BS. GG's books are still the definitive source in the hobby to start decoding, yet even they are incomplete or not always accurate.

AND FCBO AND FEBO AND FMJBO and..and..and. Accurately covering all years and codes would be a huge undertaking. That's why people don't do it and they aren't available. Plus, posting accurate info helps bad tag makes make better fakes. Keep 'em stupid so we can spot the bogus tags.

Any truly accurate and worthwhile decoder would require someone with detailed knowledge and experience in a particular plant for a particular year and the ability to write code for a decoder.

There's a reason 'good' decoders don't already exist. What was coded, when it was coded and even where it was coded changes year to year, plant to plant and even within the model year. An accurate decoders would have to be done for every plant for every year. It's is almost impossible to...