Inside memory-equipped mirrors, tiny physical tracks track the glass position. As the grease dries out and metal wipers wear away, they create internal electrical shorts.
This code often appears when the Engine Control Unit (ECU) detects that the AdBlue fluid level is critically low, the urea pump has failed, or the Diesel Particulate Filter (DPF) system is inoperable, as described on Klavkarr . It is a warning that the car is polluting beyond authorized limits. Key Components Involved citroen 09d1