Shortening Wideband Sensor or Controller wiring

I have been trying to figure out a way to cleanly integrate my dedicated link can wideband controller into the main engine harness. Is it possible intergrate the wideband wiring directly into the loom and then just have a plug in the bay that was say DTM6, then i could reterminate the original wideband cable into DTM6 and have it the perfect length. My only concern is are there any issues around calibrated wire lengths when it comes to LSU 4.9 wideband sensors.

You will want to keep the original LSU4.9 connector as there is a calibration resistor in the connector that is trimmed uniquely for each sensor. This allows the sensor to be swapped and the wideband controller can maintain calibration. You can shorten / lengthen / add connectors between the sensor connector and the controller.

That's what I was wondering about. Should they just be a matter of making an extension into for the wideband controller in the main loom and shortening the sensor cable

The Calibration resistor in the connector is calibrated including the wire to and from the sensor, cutting and splicing this wiring will change the resistance and skew to resulting values.

What about on the controller side of things, is that connector and its wires fair game. At worst i could just get a wideband sensor with a shorter cable, i just dont want to mount the controller in the bay and would rather have it integrated into the main harness with a connector inside the cabin.

From the connector to the controller, there isn't an issue with the wire lengths.

Wanted to revisit this thread.

For my build I'm using a single LSU 4.9 oxygen sensor and Motec LTC module. What I want to do is cut the five O2 sensor wires about 10" after the sensor itself and run them through an Autosport connector in the transmission tunnel. On the other side of the AS connector (in the interior) I'd terminate the wires right where I cut them, with the remaining length running to the stock Bosch connector and then the LTC. No real change in overall length, just running the wires between the sensor itself and the Bosch connector through a bulkhead.

My plan was to use AS612-98PN/AS012-98SN connectors, so all 20AWG. I'd also plan to use this connector for the reverse light switch wires, although I'm using a PDM so they aren't carrying actual current to the lights, just a low current PDM input.

Per above and some other places I've read to be careful, but I also found that Bosch themselves offer a 4.9 sensor with AS607-35PN/AS007-35SN connectors with wire lengths varying from 20-90cm. So it seems reasonable, unless that sensor with the Autosport connectors is calibrated differently.

https://www.nukeperformance.com/dokument/data_sheet_70-0258017025.pdf

Any insight would be very much appreciated! Thank you

I would air calibrate the sensors if you do this, rather than relying on the calibration resistor. It should not have an effect, but for the short time that it takes to do an air calibration, its worth it for the peace of mind.

All of the autosport equipped LSU4.9's that I have seen haven't had a calibration resistor in place, and have needed to be air calibrated before use.

Thank you Stephen, that makes sense. I had wondered how the Autosport equipped sensors worked, that clears it up.

Here's what I ended up doing. Once I get it air calibrated I'll report back. Worst case I replace with an uncut sensor through a grommet.

LSU4.9 sensor > DTM06 connector > Autosport connector in trans tunnel > Stock Bosch connector

Adding the DTM connector makes it serviceable down the line to replace the O2 sensor without touching the sealed Autosport connector. Will see how it calibrates.