"One question: What was the cause of your "faulty" check engine light? Did it yield an EGR code?"

Duke, the Check Engine Light has was simply bad. I replaced the bulb, and the engine light stayed on. I disconnected the battery for a minute, then reconnected, and the Check Engine Light operated normally.

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Steven
1989 260E (276K miles)
1995 E320 (50K miles)