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Re: PO420 code after installing an aftermarket cat
Both sensors are stock and brand new, and I've made sure the wires weren't anywhere near an RF source from the ignition. I certainly hope the dealer would've also informed me if they (or anything else) were bad.
Unfortunately, I threw out the old set but still remember the code being there before I changed them.
I'd go replace this item now, but I think $1500 is unfair for something that I could otherwise find online for about $200 and have my favorite neighborhood indie mechanic install.
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