Finally got to Auto Zone, got 2 codes: P0335: Definition: Crankshaft position sensor condition. Explanation: Crankshaft position sensor signal is monitored for faults. Probable cause: Crank sensor defective; Check connector and wiring to sensor; Check trigger wheel for damage. Code P0410: Definition: Secondary air injection system fault. Explanation: Air injection system is monitored for faults. Probable cause: Circuit relay defective or fuse open; Check connector and wiring; air pump defective or hoses blocked.
Assume next step is to get all these items checked out. I did have a 'relay module' replaced a few months ago when the light first came on at a small repair shop. Many thanks from a happy Crossfire owner, '04, had it 3 years.