P0141 is a heater code right?  If ECU's are burning out driver circuits,
it is unlikely a reflash will solve the problem.

On Aug 11, 10:13 pm, Billythew...@gmail.com wrote:

What year/model Kia? How many miles on the car? What sensor(s) did you
replace?

Two ECU's would seem to indicate the problem is NOT with the engine
computer.

P0141 basically means the rear O2 sensor heater is not working. It
could be a wiring problem or a bad sensor, or a number of other
things.

First thing to do is to verify 12 volts for the O2 heater at the plug
for the rear O2 sensor. On the plug to the O2 sensor there are
probably two white wires, those are the heater wires. On the vehicle
harness side match up the two wires that connect to the white wires.
Unplug the connector, have a helper start the engine and measure for
voltage at those two wires on the vehicle harness connector. Check as
much of the wiring as possible for damage, usually the wiring for the
rear O2 goes up into the cabin through the floorpan so only a short
section of it is exposed.

I think Kia(and Bosch, and Denso, etc) all recommend that the 4 wire
O2 sensors be replaced at 100k. It is my understanding that the rear
one isn't as critical as the front, as it only checks to see that the
catalytic converter is functional, and depending on the vehicle that
test is only done once per drive cycle leaving the rear O2 basically
doing nothing the rest of the time aside from throwing back a reading
that it in line with, but of a lower magnitude and slight time delay
than the front O2 sensor.

Chris