Replaced the Cataclysmic Converter and down-stream oxygen sensor on The Lovely Harvey's car today.
Much help and sanity preservation provided by one JT!
The check engine light had reported the rear O2 was reading wrong, but we put it off since it didn't really affect drivability.
Sometime in the intervening time, the cat had become soured as well and was starting to clog up.
Added to carbon fouled valves from too much cheap gas (she's listening NOW about that) we got some random misfires on all four cylinders.
With the new O2 and cat it's running better, but still not completely cured. Sea Foam is in the tank to start attacking the carbon deposits and will be applied every couple tanks for a while too.
The check engine light is now off except when doing the flashing for intermittent misfire.
Huge win.
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