Get these codes using Autel AutoLink AK319 on my Mazda B4000 pickup. Also with the I/M function getting CAT = "INC", not the "OK" reading given on most fields. I'm guessing INC is inconclusive but I haven't researched it yet. Seems odd to me that P1131 states "HO2S Bank 1 Sensor 1, Signal below .45 v (A/F ratio too lean)" while P1132 is "HO2S Bank 1 Sensor 1, Signal above .45 v (A/F ratio too rich)" Any suggestions on how to proceed, tests that may isolate problem? The engine leaks some oil, thinking this is a problem with the CAT and both O2 sensors as a guess.