Replacing Both Upstream o2 Sensors...location?

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06-07-2012, 10:19 PM

bzauche

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Replacing Both Upstream o2 Sensors...location?

Hey all,

One of my weekend projects is going to be replacing both of my upstream oxygen sensors. I already have the parts, but I need to know which ones are the upstream sensors. I have a 2001 with the pre-cats and 4 sensors. In the FSM picture below, am I replacing sensors 1 and 2?

Thanks!

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06-08-2012, 12:25 AM

Radi

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1&2

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06-08-2012, 08:09 AM

bzauche

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Quote:

Originally Posted by Radi

1&2

Thanks! That's what I thought, just wanted to make sure. Is it safe to assume that 1 is considered the "front" and 2 is considered the "rear" sensor?

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06-08-2012, 08:15 AM

USMCgunrock

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Quote:

Originally Posted by bzauche

Thanks! That's what I thought, just wanted to make sure. Is it safe to assume that 1 is considered the "front" and 2 is considered the "rear" sensor?

Yup! And invest on an o2 ratchet socket. Makes life a little simpler!

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06-08-2012, 11:43 AM

Bustedback

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Why are you replacing the sensors? Did they test bad, or do you just have some extra money to spend?

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06-08-2012, 12:24 PM

bzauche

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Quote:

Originally Posted by USMCgunrock

Yup! And invest on an o2 ratchet socket. Makes life a little simpler!

Thanks!

Quote:

Originally Posted by Bustedback

Why are you replacing the sensors? Did they test bad, or do you just have some extra money to spend?

I haven't tested them, but they haven't been replaced in 166k miles, so I figure it's time to swap them out. Just because I don't have a CEL doesn't mean they're not bad, either.

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