(often appearing as in diagnostic scans) is a common Citroën and Peugeot fault code typically related to the rear-view mirrors
Missing Mirror Sensors: On early models (up to OPR No. 12047, approx. November 2009), the vehicle software may look for mirror position sensors that were either omitted from the factory or removed in later production runs. citroen 09d1
Are you experiencing intermittent mirror issues, or are you seeing this code during a routine diagnostic scan? 2008 C5 2ltr hdi 138Bhp wiring diagrams. - French Car Forum (often appearing as in diagnostic scans) is a
In many Citroën models (like the C5), this code appears as a "phantom" or non-critical fault because of how the vehicle's software is configured: Mirror Position Sensors Shorter highway range compared with larger EVs
The 09D1 was essentially the development code for a large, luxury crossover/MPV hybrid. In modern terms, we would call it a "lifestyle cruiser." It was designed to be the spiritual successor to the Citroën C6, but with a twist: it was higher-riding, more spacious, and focused on "Grand Tourer" comfort rather than traditional saloon dynamics.
If you own a modern Citroen equipped with a BlueHDi diesel engine (particularly the 1.6L or 2.0L variants), you may have recently plugged in an OBD2 scanner and been confronted with the cryptic code: 09D1.