Hi Finn

Sounds like you use the same ALM board as me. All I recall is reading that you need a genuine Bosch, but not sure if that was simply sales talk.
I switch mine on manually a few moments after startup as per their instructions to avoid damaging the sensor.
I’m just in the process of building a micro I call CoPilot to manage a few things for me. One is the Wideband switch on after start.

Cheers

Steve Izett



> On 15 Jul 2023, at 1:58 am, Finn Lassen finn.lassen@verizon.net <flyrotary@lancaironline.net> wrote:
>
> I now have about 100 engine hours on my Bosch LSU 4.9 wide band oxygen sensor with the Ecotron ALM-Board (0-5V output).
>
> Recently I've seen the output intermittently  drop to 0 volts. So I replaced the sensor with one I bought on eBay a couple if years ago. (0258017025 WideBand O2 Oxygen Lambda Sensor LSU 4.9 for PLX UEGO AEM 30-2004 New).
>
> Well, that doesn't work at all. The ALM-Board outputs zero volts all the time.
>
> Anyone have experience with the Bosch LSU 4.9 oxygen sensor?
>
> Are there versions with different pin-outs but same part number (0258017025)?
>
> Finn
>
>
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