setpci: command not found

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH
/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin

If it's empty, You may set the PATH variable with this command

export PATH="/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin"

On CentOS possible default full paths are:

/sbin/setpci - from package: pciutils

You may install the required package with command yum install {package}

On Debian possible default full paths are:

/usr/bin/setpci - from package: pciutils

You may install the required package with command apt-get install {package}

Error in other languages:
setpci: bevel nie gevind nie
setpci: comandă negăsită
setpci: comando não encontrado
setpci: commande introuvable
setpci: command not found
setpci: käsku ei ole
setpci: không tìm thấy lệnh
setpci: komanda nerasta
setpci: Kommando nicht gefunden.
setpci: kommandot finns inte
setpci: komut yok
setpci: nie znaleziono polecenia
setpci: níor aimsíodh an t-ordú
setpci: no se encontró la orden
setpci: no s'ha trobat l'ordre
setpci: opdracht niet gevonden
setpci: parancs nem található
setpci: perintah tidak ditemukan
setpci: príkaz nenájdený
setpci: příkaz nenalezen
setpci: команда не найдена
setpci: командата не е открита
setpci: 命令找不到
setpci: コマンドが見つかりません