Another question, was your speedo still working even with the 0715 speed sensor code? I've got a 97 E320 parts car that stays in 2nd limp / CEL on. One time after start up it did shift fine but from the next key cycle it went into limp.

Another oddity is when the trans is stuck in 2nd,the dash mounted high beam indicator is on and there is a warning message on the driver info display. ( it is ABS or ASR , don't remember. ) The speedo works through all of this so it either gets a speed signal from the ABS sensors or the trans output shaft speed sensor is intermittent.

Somewhere I came across some info that these cars used a front ABS sensor to drive the speedo.