O2 Sensor, Bank what? - Ford Mustang Forum
 
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post #1 of 2 (permalink) Old 06-02-2006 Thread Starter
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O2 Sensor, Bank what?

I realize there are hundreds of O2 sensor threads, so I apologize for this one. There seems to be so much conflicting information, so I'm just starting a new one.

Car - 1995 Ford Mustang, 3.8, stock everything (AFAIK)
Check Engline Light codes pulled by Advance Auto:

P0171 System Too Lean (Bank 1)
P0174 System Too Lean (Bank 2)

There are 4 O2 sensors (some threads said 2!) on the car. My question is concerning which ones need replaced. I've read that Bank 1 is the drivers side and then I've also read that Bank 1 is the passenger side. Which is it?

But... here is what Advance is telling me: Bank 1 is the front two and Bank 2 is the back 2. But people on here say Bank 1 is the Driver side (I assume front and back) and Bank 2 is the passenger side (front and back). Can somebody please clear this up for me?

Based on the two codes I posted above, which sensors should I be replacing (Both in the front, or 1 in front and 1 in back on the same side?) If there are two sensors per bank, how do you know which sensor for that bank needs replaced, based on the codes I posted above?

Thanks!

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post #2 of 2 (permalink) Old 06-02-2006 Thread Starter
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Well, for the record, I think the above problem was fixed by a broken vacuum hose. I'd still like the bank 1/2 confusion cleared up though.

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