P0452
LowP0452 — Fuel Tank Pressure Sensor (EVAP): Low Signal
Description
What the Code Means
P0452 sets when the fuel tank pressure sensor reports a value below the expected range. The sensor monitors pressure in the evaporative emissions (EVAP) system and lets the control module detect leaks. A low input signal can come from a faulty sensor, wiring problems, or a large leak in the system.
Symptoms
Symptoms
- Check Engine Light is on
- Fuel smell
- Rough idle possible
Causes and fixes
Diagnosis and Repair
- Check the fuel tank pressure sensor wiring.
- Check sensor voltage: reference voltage is 5V, and the signal should change.
- Replace the sensor if faulty (OEM BMW
16147276055). - Check the EVAP system for leaks.
Possible secondary damage
Secondary Issues
- Fuel vapor leaks can cause handling problems.
- Increased fuel vapor emissions make the exhaust more harmful.