Engine compartment overview with callout labels for adapter, dead center locator, pressure loss tester, and filler neck cap on Smart 453.

Two black and white photos showing engine bay components and diagnostic tools with numbered callouts 3-6.

View full-size image ↗

See all Powertrain figures for the Fortwo / Forfour (453), or browse the full figure library. Part numbers and callouts are community-sourced and cross-referenced against the manuals — confirm with your VIN before ordering.