This is the electronic throttle control or actuator control, also called the e gas

Any ASR equipped M104 car (300E, 300TE, 300CE, E320) from '93-'95 will have one.

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David Hendy
'97 Renntech E60RS
'97 GMC 2500 Sub' Diesel
'95 E300D
'88 300TE
'88 250TD
'84 L/Rover 109