Catalyst control
Kuongororwa kwedhigirii rekupfeka kwechigadziriso, inozivikanwa nehunyanzvi secatalytic converter, iyo inogara ichiitwa ne-on-board diagnostic system, inosanganisira kuongorora shanduko yeokisijeni yemukati mumagasi ekuburitsa pamberi uye mushure meiyo catalyst.
Nechinangwa ichi, masaini anotumirwa neokisijeni sensors (anozivikanwawo selambda sensors) anoshandiswa. Imwe yemasensa inoiswa pamberi pake 
catalyst uye yechipiri kumashure. Kusiyana kwezviratidzo kunokonzerwa nekuti imwe yeokisijeni mumhepo inoputika inobatwa nechinokonzera uye naizvozvo iyo okisijeni inowanikwa mumhepo inoputika iri pasi pemvura inogadzirisa. Kuwanda kweokisijeni yechinhu chinokonzeresa kunonzi kugona kweokisijeni. Iyo inoderera sezvo iyo catalyst inopfeka, izvo zvinotungamira mukuwedzera kwechikamu cheokisijeni mumagasi ekubuda achisiya. Iyo on-board diagnostic system inoongorora huwandu hweokisijeni yekatani uye inoshandisa iyo kuona kushanda kwayo.
An oxygen sensor yakaiswa pamberi peiyo catalyst inonyanya kushandiswa kudzora kuumbwa kwemusanganiswa. Kana iyi ndiyo inonzi stoichiometric musanganiswa, iyo iyo chaiyo yakawanda yemhepo inodiwa kupisa muyero wemafuta pane imwe nguva yakaenzana neinoretical yakaverengerwa mari, iyo inonzi binary probe. Inotaurira hurongwa hwekutonga kuti musanganiswa wakapfuma kana kuti wakaonda (yehuni), asi kwete nehuwandu. Iri basa rekupedzisira rinogona kuitwa neinonzi Broadband lambda probe. Yayo inobuda parameter, iyo inoratidza iyo okisijeni yemukati mumagasi emhepo, haisisiri voltage inoshanduka nhanho (senge mune maviri-nzvimbo probe), asi rinenge mutsara rinowedzera simba razvino. Izvi zvinobvumira kuumbwa kwemagasi emhepo kuyerwa pamusoro pehuwandu hwehuwandu hwehuwandu hwemhepo, inozivikanwawo sereshiyo ye lambda, nekudaro izwi rekuti Broadband probe.
Iyo lambda probe, yakaiswa kuseri kwecatalytic converter, inoita rimwe basa. Somugumisiro wekuchembera kweokisijeni sensor iri pamberi pechinokonzera, musanganiswa unogadziriswa pamusana pechiratidzo chayo (yemagetsi yakarurama) inova yakaderera. Uyu ndiwo mugumisiro wekuchinja maitiro e probe. Basa rechipiri okisijeni sensor ndere kudzora avhareji yekuumbwa kwemusanganiswa wakatsva. Kana, zvichibva pazviratidzo zvayo, mutongi weinjini anoona kuti musanganiswa wakanyanya kuonda, ichawedzera nguva yejekiseni maererano kuitira kuti iwane kuumbwa kwayo maererano nezvinodiwa purogiramu yekutonga.
