I had this 2002 Ford Focus with this wacky "split port induction" engine once. It never had a code. One day, on a family camping trip three hours from home, we stopped for gas. I filled it up and went into the store. On my way out and back to the car, my wife starts it. There's an immediate racket like a giant fork in an even giant-er garbage disposal, then a few seconds later it stalls. It starts up again and runs for a few more seconds, this time the sound is a tenth of its original volume, and the engine then dies for the last time. Cranked forever after that with not a sign of any further life. The end.
I had a brand new Civic Hyb. in 2008 which had a control on the transmission which sent a sync signal to the engine, or so I was told by a dealer. The control on the transmission was not sending a correct signal to the engine and it would not go over 40 MPH with very high RPMs. It was fixed by a dealer who paid most of my towing charge.