203 return code from systemd means it cannot run the program that you put 
in your ExecStart line. First hit from Google explains it:
https://unix.stackexchange.com/questions/472950/systemd-status-203-exec-error-when-creating-new-service

Maybe that file doesn't exist, or is not executable.

For further help, you'll need to show the entire content of your service 
file, and the output of "journalctl -eu node_exporter"

On Tuesday, 7 June 2022 at 19:29:40 UTC+1 [email protected] wrote:

> Hi all,
>
> I want to install node_exporter binary file in ubuntu os.
>
> I am running as a service file. But I am getting error when running the 
> command systemctl status node_exporter:
>
> Active: failed (Result: exit-code)
> node_exporter.service: Main process exited, code=exited, status=203/EXEC
>
> What can be the solution for this error?
>
> Thanks & regards,
> Bharath Kumar.
>

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