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Which 02 sensor to change?

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I have a 95 legacy that I have been slowly learning to maintain. I want to change the 02 sensors because I bought the car at 107K and I now have 155K on it. I think that there are 2 sensors in the legacy. Which one, should I change, or should I just do both?

 

Thanx,

Pete

I have a 95 legacy that I have been slowly learning to maintain. I want to change the 02 sensors because I bought the car at 107K and I now have 155K on it. I think that there are 2 sensors in the legacy. Which one, should I change, or should I just do both?

 

Thanx,

Pete

 

You could do both, but if you just do one, do the front one first. The front one is used for fuel trim, and the second one is a check on the first.

  • Author
You could do both, but if you just do one, do the front one first. The front one is used for fuel trim, and the second one is a check on the first.

 

By front, you mean the one that is closest to the engine, right? Thanx.

By front, you mean the one that is closest to the engine, right? Thanx.

 

Yeah, front is closer to the engine. . .

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