Thanks. Can it be accessed and removed easily? The pdf doesn't help too much. I'm getting no indication of a hard start or even a rough idle. I just found the code when I was clearing it today after about 6 months of not clearing them all. If it's no big job to replace, I will order the part and plan on doing it before it actually starts to cause noticeable problems.

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1993 400E, 256,000 miles (totaled)
1994 E420, 200,000+ miles
1995 E420, 201,000 miles