Does the Nissan Titan use the newer air/fuel ratio linear O2 senosrs, or does it use the more traditional zirconia "switching" O2 sensors (which we all have grown to know and love . . . )? What about the rest of the Nissan lineup? How do you instrument the newer O2 sensors for testing? I understand that instead of a voltage swing, the use a current to indicate leaness or richness. At stoichiometric 14.7:1 they put out zero current. Otherwise the output current can be anywhere from about plus or minus 2 milliamps depending on whether the mixture is lean or rich. Thanks in advance for any info.