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o2 sensor? Which one?

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Car was running rich, I figured it was o2, had it diagnosed,

They said it was Bank 1 Sensor 3 o2 Sensor

Just confused because they said bank 1.....

Doe that mean its the one in the manifold on the Bank 1 side or does it mean it's sensor 3 which is by the cat?

PS: this is a 97 STS

please help, thank you

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Bank one, sensor three would be the oxygen sensor located directly behind the catalytic converter.

What was the trouble code (DTC) reported?


Drive your car.

Use your cell phone.


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That's the one that easiest to reach. I would get another mechanic, one that understand DFI. I would start by reading the car's trouble codes myself. Here's how:

-- Click Here for CaddyInfo page on "How To" Read Your OBD Codes
-- Click Here for my personal page to download my OBD code list as an Excel file, plus other Cadillac data
-- See my CaddyInfo car blogs: 2011 CTS-V, 1997 ETC
Yes, I was Jims_97_ETC before I changed cars.

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