: The fault is often listed as "intermittent," meaning the key might work sometimes but fail at others.
The car may intermittently fail to detect the key when inside the reader. Electrical circuit fault: have your vehicle repaired b173d peugeot work
This is a less-common but notable cause. In keyless start systems, the BSI relies on a signal from the brake pedal switch to allow the engine to start when you press the start button. If the brake light switch is faulty, the BSI may not receive the "brake depressed" signal, leading to communication confusion with the key and triggering codes like B173D or B180E. If your brake lights aren't working or seem inconsistent, replacing the brake pedal switch is an inexpensive repair that has helped some owners resolve intermittent starting faults. : The fault is often listed as "intermittent,"
Reconnect, wait another , then turn on the side lights and ignition without starting for a minute to allow the BSI to re-initialize. In keyless start systems, the BSI relies on
Understanding Fault Code B173D in Peugeot and Citroën Vehicles
Frequent alerts on the dashboard even when the key is in the ignition or reader. Occasional starting: The car might start fine one moment and fail the next. Top Causes and How to Fix Them
The most common cause for "key not detected" warnings.