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2005 ml350 is there a relay for the 02 sensor heaters? if so where can i find it

(2005 Mercedes-Benz ML350)
in Medford, NY on January 17, 2013
i had the car to a shop they said it needed 02 sensors replaced all4 did nothing code still says 02 heaters cant go on letting this guy replace parts at my cost thank you jim
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