2005 Mercedes-Benz ML350 Q&A

2005 Mercedes-Benz ML350 Question: 2005 ml350 is there a relay for the 02 sensor heaters? if so where can i find it

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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