Hi, I'm about to replace a lambda sensor on an abf converted Mk1 as it stinks of unburnt fuel and was wondering if a wideband lambda sensor could be used instead of the standard (presumably narrowband) version please ? The need for a wideband sensor is because I'm planning on running megasquirt in the future. Also, the ETKA I've consulted gives options for a cat-equipped vehicle (021906265C) and non-cat equipped (330 906 265), so logic would suggest as I don't run a cat that I pick the first option but does anyone know why they are different please ? Thx in advance
Are you saying I should get one of each or will the wideband emulate a narrowband for the ABF ecu please ?
A wideband will not work with an ABF ECU without some sort of converter if they exist. They are different technology and output their signals/need controlling in a totally different way to a narrowband. As for the part numbers 021906265C has a 4 wires going from the plug to sensor while 030906265AA has a 4 pin plug still but one of the wires has a ring terminal earth on, so only 3 wires actually go to the sensor. As for any other difference it could be that the car with Cat has 4 wires so it can accurately monitor the heater for emissions purposes. Although really, I have no idea
the only difference between ABF +CAT and ABF -CAT is the non cat version has a higher wattage heater to make up for the lack of extra heating into the exhaust from the cat. they are wired exactly the same and will swap either way. post-96 the plug shape changed, but the actual probes are still the same. as said, for a stock ABF ECU you need a narrowband, you could get a wideband and wire it to the ECU via a wideband controller with narrowband output. or if you're going to megasquirt pretty soon and dont need a full controller say for an AFR gauge just leave the lambda unplugged, the ABF will drive fine without it just not quite as well with it. I drove mine for a week without as I couldnt face going under the car again, once lambda fitted the only difference I noticed was it was a bit smoother on/off idle. You may notice a difference on a set of rollers or if your arse dyno is more sensitive than mine. not something I would do long term, but if its only a few months till you go megasquirt then be fine
Thanks to all for the contributions and the excellent insight, I shall seek out a wideband controller with narrow band output, to be able to use the digifant ecu and to be ready for the swap to MS. Any recommendations on a wideband controller to help 'narrow' down the search please ?
I can lay my hands on an Innovate LC-1 wideband controller (the later version with serial starting CLC) apparently. Anyone used one of these please ?
