So trucks these days have whats called a urea tank. It gets injected into diesel streams to knock out harmful pollutants and its required by federal law. My truck had in its place an oily rag and a few twists of bailing wire. but...my computer tells me the urea tank is topped up and ready to go!
Turns out the last shop this truck had been to was investigated by the EPA, NHTSA, and FBI and convicted for hacking ECM's. They were even forging certifications and licenses. The driver of the T700 I was working on had a revoked class C license and had never received formal training. Long story short, the chop shop owner was cooling his heels on a 12 year federal sentence and my T700 driver was arrested when he showed up with the insurance adjuster.