Where is horn located on proton wira? - 2002 Proton 400

SOURCE: Proton Wira P0170 P0172

code p 0171 refers to system too lean bank 1===causes ---intake / exhaust leak---AIR system---MAF/VAF sensor ---fuel pressure / pump/ regulator--injectors---heated oxygen sensor (HO2S)
code p 172 refers to system too rich bank 1====causes ---intake blocked ---EVAP canister purge valve ---fuel pressure --- EGR system--- injectors---HO2S
as the HO2S is in both codes , check/ replace it as it reports to the ECM for air /fuel mixture settings and if faulty it can set to too lean or too rich or swap between the extremes