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Message: <blockquote data-quote="INW-Iron-Steel" data-source="post: 24445" data-attributes="member: 11733">Delphi ES20094 installed as upstream sensors on the 04 this afternoon. No pending codes after initial cold startup, I guess we'll see if that lasts. Live data on the scanner looked good also. Not sure if this is related, but the resistance on the heater circuit between all of the brands was different. The Bosch sensors I had removed measured 12 ohms, the Delphi measured 10 ohms, and the two Densos measured 6 ohms.Now to see if I can get Autozone to take the Densos back. The initial attempt resulted with a manager telling me "Well these are used, you can't return these." How else would I be able to tell you they are faulty?</blockquote>