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Where is the Bank one sensor one 0xygen sensor located?

April 26, 2017Bank cadillac deville Eldorado ESC located sensor Seville STS

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Where is the Bank one sensor one 0xygen sensor located?

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I have a 1997 eldo and I have a code for a bad 02 sensor…… I’ts the bank 1 sensor 1 sensor…….. I need to know if it’e one of the two 02 sensors that run from the catalytic converter or one of the two 02 sensors that attached to the motor. I have changed all four before on a 96 STS that I had and if I remember correctly there was one one top of the motor back by the fire wall that was very hard to get to along with the other one on the bottom of the motor that wasn’t very easy to get to as well.