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Discussion Starter #1
I got a OBD2 code of 0135: oxygen sensor/heater bank 1/sensor 1

I assume that this is for the upstream sensor

does anyone know the OEM or GM part number for this sensor?

This sensor sits just behind (or in)the exhaust manifold and is accessible from the top of the engine. (correct?)

Looking at rockauto I see three AC Delco candidates:

1) center
2) professional
3) exhaust manifold

What's the difference?

I'm looking for the cheapest one that will get me through inspection.

Any thoughts on the Denso 234-4342?

I would appreciate any suggestions.

Helixal
 

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Discussion Starter #2
I installed the Denso Oxygen Sensor and it did the job.

The old one was a bitch to get out. I suggest a good quality tool. Finally found a Snap-On.
 

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Maybe nobody answered back because you failed to tell us the year and engine. These ecotec engine don't like anything but ACDelco. You might get lucky but don't be surprised if it fails within 3 months.
 

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^ I second this. In my case a week
 
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