> > Sounds like it must be the Bosch sensor--that one uses four wires--anybody > know for sure?? > > Greg I have both the Bosch and NTK wide range meters and it sure looks like the NTK to me. The Bosch has different openings than I see on that sensor. Could be a cheaper, wider tolerence built, version of the NTK or based off the Toyota sensor which I believe is a NTK clone too. frank