Originally Posted by
ZOOTECH
We had the L4-12 error on a MX-B401 that would clear by pow down/up but then was pretty steady. It turned out that a simple cut of the shutter that covers/uncovers the Resist Pro-con sensor (item 28, section 31) allows it to work properly. The edge of the shutter (item 22, section 31) that covers/uncovers the sensor has a beveled edge that can be snipped off (about 1.5 to 2mm) and no more L4-12. This will work on the C-Frontier as well, but only the black tab is to be cut if you're getting this code.
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