This inquiry explored bilingual error discernment by measuring the repair rate of language intrusions that originated while bilinguals generated sentences in a language switching context. Two leading accounts of error discernment in a bilingual setting were compared: the conflict monitoring and the perceptual loop account. The results showed that the repair rate of language intrusions was higher in switch than repetition trials, thus supplying evidence that bilingual language interference encourages error detection, in line with the conflict monitoring account.