lambda sensor cal

[ElectronSpeed]

I have a customer that bought a new set of lambda sensors and would like to fit them. To help him set up the LSU4 sensors I asked him to read the calibration number on the connector and measure the calibration resistor. I got back 308 with 130.5 ohms and 807 with 165.7 ohms. These are so far from the 1000 to 1200 range that I typically see that I am questioning the information. Also there appears to be disagreement between the marking and the resistor. What do you guys commonly see on the LSU4's ( i.e. 0 258 006 066 )?

[Dragon]

Shouldn't the calibration be engraved on the body instead of the connector of the lambda sensors that are supplied by Motec? I don't think Motec require the resistors to work.
You can do a free air calibration to verify the calibration numbers.

[ElectronSpeed]

You are correct that the Motec ECUs do not directly read the resistor. That is why we need to enter the correct calibration number.

My understanding (/experience) is that the free air calibration only works well on used sensors.

Thanks,

Eric Schieb

[killerbee]

If memory serves there used to be a note on the old motec usa site that said to measure the resistance between pin 1 and 6, multiply by 10 and that is your calibration number. For my sensors the result closely matched the free air calibration I did on my 066 lsu4s.