So this is strange. Took my SL into Enrique (SoCal guys know who this is) a few weeks ago when the CEL came on. He replaced the mass airflow sensor and all seemed good. Drove it for two days, then went away for the weekend. Upon return the car will not start. Engine cranks over, but will not fire. Checked all applicable fuses and all look good. No other outward signs of trouble. Yes it has fuel in the tank.

Any thoughts on how to diagnose? Thanks

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1999 SL500