Replaced the EUC, but the check engine light still stays on, even after the key is out.
The code says 1, which I understand to mean no faults.

Am I not clearing the reader correctly?

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1991 300E 124.030 103.983KE 722358 03 412178
207K

1979 240D 123.123 250K (Project car)

2000 Ford Ranger, 187K

2015 Dodge Ram 1500 EcoDiesel 37K