The SBC has a 25-year unlimited mileage warranty. One of my '06 E320CDI's has had to go in twice for two separate problems about three years apart. MBUSA paid for the whole thing both times, including the tow from my house to the dealership. They don't "replace" the SBC, they diagnose it and fix whatever is malfunctioning.

HOWEVER, the big red stop sign came up on the dash display and the braking function was severely reduced both times my SBC malfunctioned, so if this isn't happening on your car, it might not be covered by the warranty.

What specific codes are you getting and what device are you using to read them?

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Robert Fini

'12 ML350 BlueTec, 111k
'06 E320CDI (x2)
'05 T1N Sprinter 2500/Pleasure-Way Plateau TS, 72k
'97 C36AMG, 325k (son's)
'94 E320T, 249k
'93 190E Sportline LE, 168k (daughter's)
'84 190E-2.3/5spd (Stage Rally Racer)
'66 230 W110 Sedan (Barn Find, Vintage Racer build in progress)