Perrin Performance o2 simulator FTW! Eliminate the downstream o2 and forget about it.

 

80k miles? hmm.. mine is now going for 100k..

well, i should get it changed soon anyways. thanks~

 

Go to an actual Mitsu Dealer and have their mechanics run the code. I just had this happen and they determined that the cat converter was bad. Now, get this, my car has absolutely no warranty on it but the parts and labor were still covered because it is federal law (I think it's federal law...or at least state law in Nevada) that the original OEM exhaust that is required to meet environmental requirements must be covered by the manufacturer for a minimum of 8 years. Anyway, take it to a dealer, or at least call a dealer with your findings and if they agree that it's the cat converter, than I'm thinking you should get it fixed for free.

 

is the honestly what needs to be done to remove the rear o2? also i cannot find out where the rear o2 is, are their 2 cats on an 02 lancer or a cat, resonator, and muffler? pics anyone?

 

You need an O2 sensor wrench. The sensor is located by the second cat which is after your downpipe. The first cat and O2 sensor is in your exhaust manifold.

 

you don't exactly need an o2 wrench just a wrench thats the right size.

 

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removed mines in 15 secs.