Successful reading comprehension – especially in a second language (L2) – relies on the ability to monitor one’s comprehension, that is, to notice comprehension breaks and make repairs. Comprehension monitoring may be limited given effortful word processing, but may also be supported through active control. The current study addresses to what extent increased word processing difficulty reduces adolescents’ ability to monitor their comprehension when reading in their L2, and whether readers can compensate limitations given sufficient executive control. To this end, we conducted an eye-tracking experiment where 34 adolescent L2 learners read short expository texts that contained two within-subject manipulations. First, comprehension monitoring was tested through textual inconsistencies, such as when the topic changed from speaking Spanish to speaking Russian vis-à-vis consistent controls. Second, word processing difficulty was altered by inserting either shorter and higher-frequency words such as want, or longer and lower-frequency words such as prefer. We additionally measured each participants’ executive control. We found evidence of successful moment-to-moment monitoring in the L2, as visible in adolescents’ increased rereading of inconsistent as opposed to consistent information. We also found that adolescents adapted their monitoring differently to word processing difficulty, depending on their executive control: while adolescents with weaker control abilities reduced their monitoring given higher word processing difficulty, adolescents with stronger control abilities monitored their comprehension more (instead of less) on difficult texts. These findings provide insights into how comprehension monitoring in the L2 arises in the interplay of limitations due to lower-level processing load and compensation thanks to active control.