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For about 6 months I had been getting P0430. Only once I got a P0420.
But for the past 10 days and 350 miles, since cat efficiency monitor has been in fail state, no codes whatsoever.
When I start the car, all four voltages fluctuate between .05 and .8 volts.
Once warmed up, while driving on the freeway at around 70mph, both voltages ahead of cat fluctuate between .1 and .75 volts; voltages after fluctuate from .5 to .75 volts with bank 2 fluctuating more, and more often than bank 1.
While decelerating under engine braking all four drop to near zero.
After a long drive, if I let the engine idle for 2-3 minutes, voltages ahead fluctuate between .05 & .8 volts; voltages after from .6 to .75 with bank 2 fluctuating more.
I hope this is sheds more light on the problem.
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