Changed the O2 sensor yesterday, and noticed the check engine light was off as I started to drive.

Darn, if the light didn't turn on again, after about 15 miles.

Checked the code when I got home, and there was 17 again, as if I didn't change anything.

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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