tabo:

These are the codes I got from the OBD II scanner:

1. P0212. "Injector Circuit - Cylinder 12."
2. P0215. "Engine Shutoff Solenoid."

What little I have been able to glean from the internet is that the engine shutoff solenoid is typically assocated with a diesel fueled vehicle... Where is it on this engine? I guess I need a book...

As for the cylinder 12 error, the only think I can think of is the dual spark plugs per cylinder. Could one of them be coded as "cylinder 12."

Regarding performance, I have seemingly noticed no difference in power output. The engine accelerates briskly. Idle "seems" a bit unstable, however, especially as the AC compressor cycles on and off. There is a "slight" stumble in idle speed when the compressor clicks on. Engine idles about a needle width above 500 rpm.