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Engine light OBD code P0135


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1996 GMC Suburban K2500 7.4 check engine light goes on for a few days, then off, then back on again. I put the OBD and it shows code P0135, Oxygen sensor bank 1 sensor 1. If I'm not mistaken, this is the upstream sensor on the driver's side.

 

I did a web search and came up with a lot of hits, some sensors are labeled as "heated sensor", some are not. I have a few questions.

 

1. Should these be replaced in pairs, both upstream and downstream?

2. Does anyone have a part number, or link to the correct sensors.

 

Thanks.

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