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 Post subject: How many O2 sensors ?
PostPosted: Tue Apr 16, 2013 11:52 am 
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Joined: Fri Apr 12, 2013 10:56 pm
Posts: 88
Location: East Arkansas
Year and Trim: 2003 Bonneville SE -normally aspirated- 4 door
Can someone tell me how many and where (basically) my O2 sensors are on my car? I'm buying an aftermarket module/tune and the programmer is turning off the back two, but I am unsure if I have 1 pre-cat O2 sensor or two. My repair manual is of no help and I've been able to find an underside view of my model car, etc.

2003 Bonneville SE, non-supercharged 3.8 Series/Gen II engine

I want to replace the remaining O2 sensor(s) that will still be functioning with new module/tune, mainly due to this being a used car with 77,000 miles.

I do not use Bosch! Plan on NGK, Denso, or AC Delco/ Delphi

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PostPosted: Tue Apr 16, 2013 11:59 am 
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Location: Grand Rapids, Michigan
Year and Trim: 2014 Cadillac XTS Vsport.
There are two sensors. One pre-cat, which is on the top/center of the rear exhaust manifold. The post cat is in the exhaust behind the cat, hidden by a metal shield.

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PostPosted: Tue Apr 16, 2013 3:52 pm 
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Joined: Fri Apr 12, 2013 10:56 pm
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Location: East Arkansas
Year and Trim: 2003 Bonneville SE -normally aspirated- 4 door
Thank you very much Archon!

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