Mercedes-Benz CLK Class 2003 — technical service bulletin
Bulletin 070021D · NHTSA communication 10000638 · issued Dec 2, 2002
Technical service bulletin
communication type
Engine and Engine Cooling
component
2003
model years
3
vehicle entries
Official summary
Engine ticking (piston slap) noise complaints when accelerating between 1200 and 3000 rpm. Models e500, sl500, clk500 my2003. *tt
What a TSB means. Technical service bulletins are repair guidance manufacturers send to dealers — they are not recalls, and repairs are not automatically free (warranty extensions are an exception worth checking). The full document is available via NHTSA’s vehicle lookup.