Bugger, the write-up i have is within the extremely very early UK aw11 ecus which didnt appear to operate a cat over in britain, so no further details about exactly what the O2 sensor does listed here. If they are not in tolerances, you need to change the size with https://toyota4ageblacktopenginef63763.spintheblog.com/27125747/5-essential-elements-for-4a-ge-engine-for-sale