No, the OVP will not come up when you read the codes. I would change it no matter what. It's only a $50 part and takes less than 5 minutes for someone that knows where it is. This is such a common problem with these cars I can assure you the results will be good.
And as Glen said, be sure and only drive it hard once the gar is up to operating temperature (about 85 C).
And of course, don't use the platinum plugs. Have them changed with a good Bosch copper plug. Supposedly the platinum plugs can break apart in the cylinder, or something of the nature?
2006 E350 w/ 155k miles (Daily Driver)
1993 300E 3.2L Sedan w/ close to about 300k miles
2003 E500 Brilliant Silver (Had 217k miles when totalled!)
1989 300E with 289,000 miles (had for <1 yr while in HI)
03 CLK 500 cabrio (Mom's)
2006 C230k (Dad's)
1999 S420 (Mom's/Dad's)
2000 C230k Sport sedans
2001 CLK320 Cabrio (Mom's)
1995 C280 My First Mercedes-Benz... (155k miles. EXCEPTIONAL AUTOMOBILE. Was Very hard to let go of!)