TurfBurn said:a wideband will tell you if it is safe.... well more or less... it'll tell you are hitting AFR, but if you lose an injector you should know it otherwise anyway... There is no single device more critical to tuning a car than a wideband and by no stretch of the imagination does a narrowband cut it!
I have come to believe this as well over the last few years with all the experiences I have been thru.