Speakers self-correct small variations they hear in their own speech, whether self-produced or experimentally induced perturbations to auditory feedback. In a first language (L1), phonetic categories and therefore auditory expectations are well-established, but in a second language (L2), lack of experience with new categories may interfere with the ability to detect and correct such deviations. We present two companion studies to test how English speakers learning French detect such variations in their auditory feedback in both L1 and L2. In one study, speakers uttered monosyllabic English and French words while simultaneously receiving different levels of masking noise to determine how access to auditory feedback information impacts speakers' ability to make online adjustments to self-produced speech. There was greater acoustic variability at the midpoint of utterances in L2 than in L1, regardless of noise condition, consistent with a differential use of auditory feedback information in the two languages. In a second study, speakers received altered auditory feedback. On one-third of trials, the vowel formants of produced words were shifted up or down, creating the perception of an error. We will compare correction of internally and externally generated error to understand speakers' sensitivity to auditory feedback in native and learned languages.