Have a 03 CLK500 with 700 miles. At 550 the check engine light came on, dealer said #1 cyllinder missing so they replaced the coil & then it started missing on #4 so they changed the crank sensor & I took it home. At 700 miles the check engine light came on again, still missing so they changed the coils & wires & said the computer shows a code for 1/2 or partial throttle. Any ideas??? Also after reading here about the motor mounts on the 500 I asked my dealer about checking the Vin range while the car was in. It showed mine qualifies but they cannot replace because unless they are bad MB will charge them, does that sound right??