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post #1 of (permalink) Old 07-26-2005, 05:40 PM Thread Starter
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O2 sensor question???

Hey guys,
I don't spend much time on these boards anymore due to my current quest to sell my K5, but I'm helping a buddy fix his conversion van and the first place I thought to go was here. It's a 96 Express 1500 with a 5.7L and the check engine light popped on. I ran my OBDII diagnostics computer on it and I'm getting a P0135 and P0133, which denote that the Bank 1 Sensor 1 O2 sensor is most likely trashed, but when I crawled under to take a peek, I came to find that the damn thing has FOUR freakin O2 sensors, one on each bank, one right in front of the cat, and one right behind the cat. My question to you is this: Does anyone know which sensor would be Bank 1 Sensor 1? My common sense tells me that it'd be one of the forward sensors, but I'm at a loss for guessing which side it'd be, and I'd hate to have him drop $300 to replace all 4 if its just one of them.
Any help or advice on this would be much appreciated, thanks!
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post #2 of (permalink) Old 07-26-2005, 08:17 PM
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Re: O2 sensor question???

Bank 1 is driver side, sensor 1 is front. Bank 2 is pass. side, sensor 2 is rear
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post #3 of (permalink) Old 07-26-2005, 09:11 PM
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Re: O2 sensor question???

You know, when I had one go out, I just replaced all four. My engine runs evenly, doesn't foul anything, so I figured when one went out, the rest were on the way.
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