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Please help diagnosing an O2 sensor problem!

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Old 04-27-2006, 02:37 PM
  #1  
Gaspi101
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Default Please help diagnosing an O2 sensor problem!

Hey all. Yesterday I got a check engine light, and the code was for Short Term Fuel Trim Too Rich. Naturally, I suspected the O2 sensors. Apparently, BOTH of the Bank 1 and Bank 2 Sensor 2s are dead. What I want to ask is this: Are the Bank 1 and Bank 2 sensor 2s on ONE side of the exhaust, meaning, the pre and after catalytic sensors, or are these both the after cat sensors from both sides?

I suspect they are the after cat sensors from both sides, and if that's the case, what could cause both of them to suddenly stop working? I could understand one of them, sure. And I could understand two sensors, if they were the pre and after cat sensors on one side, which would likely indicate a bad catalytic converter--but BOTH after cat sensors from both sides? What could have caused that?

I'd appreciate any help at all. THANKS!!!
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Old 04-27-2006, 04:01 PM
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anthonydalrymple
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Default RE: Please help diagnosing an O2 sensor problem!

Before spending any money; get under there & inspect the harness & connectors.

I'm thinking odds are two won't go bad at the same time. But it is possible that if at least one worked; the computer recieved enough info to keep the eng light off..... I do not know for a fact though....
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Old 04-27-2006, 04:07 PM
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Gaspi101
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Default RE: Please help diagnosing an O2 sensor problem!

Yeah. that's another weird thing. I didn't have an O2 trouble code shoot up, but a rich short term fuel trim code. The fuel mixture code is much worse than the o2 reading, though, meaning that the sensor's malfunctioning has caused a bad fuel mix. Theoretically, I should have had the o2 sensor trouble code FIRST, and then, when the problem got worse, a fuel trim code. So, yeah, it's weird. Anyone have any ideas?
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Old 04-27-2006, 04:09 PM
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Gaspi101
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Default RE: Please help diagnosing an O2 sensor problem!

The other possibility, which I'm praying isn't the truth, is that something ELSE caused the rich trim, and it was the unburned gas going through the exhaust that screwed up the sensors. That would explain why both sensor 2s are out of commission. Maybe they're not so bad as to shoot a trouble code, but the rich trim is being caused by something else? Any ideas?
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