The Quick Answer above is the generic definition. What follows is the model-specific detail for the BMW models that log P0454.
DTC/P0454·BMW
P0454 on BMW: Causes, Symptoms and Fix Cost
Quick Answer
Low SeveritySafe to drive (short-term)BMW
P0454 on a BMW means the ECU detected an intermittent fault in the EVAP system fuel tank pressure (FTP) sensor signal. The sensor is typically mounted on top of the fuel tank or in the fuel pump module and reports tank pressure to the ECU during EVAP self-tests. Intermittent codes usually point to wiring issues, a flaky connector, or a sensor in early failure.
Typical repair cost, all makes€60 - €900
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BMW 3 Series
2005-2024BMW E90/F30 fuel tank pressure sensor is integrated with the fuel level sensor on top of the tank. Access requires removing the rear seat cushion. The connector is a known intermittent failure point after exposure to road salt and moisture. BMW sells the sensor separately for around 80 EUR, no need to replace the full module.
What causes P0454 on a BMW?
Beyond the generic causes listed on the main P0454 page, these are the patterns noted for BMW models:
BMW 3 SeriesIntermittent connector contact on E90/F30 fuel level sender assembly
BMW 3 SeriesWater intrusion under the rear seat after sunroof drain blockage
How to diagnose P0454 on a BMW with OBD2
Follow these steps to pinpoint the root cause of P0454:
- Read freeze frame data to see what the FTP sensor reported when the code set. Compare to atmospheric pressure (around 101 kPa). Wild swings or readings far from atmospheric indicate sensor or wiring issues
- Access the FTP sensor. On most vehicles it is on top of the fuel tank, requiring you to drop the tank or access through a service hatch under the rear seat. Inspect the connector for moisture or corrosion
- Wiggle-test the connector and harness with the engine running while watching the tank pressure reading. Some cars report it as standard OBD2 live data; on others it needs manufacturer-level software. Sudden jumps in the reading during the wiggle confirm a connection fault
- Measure sensor reference voltage (typically 5V) and ground at the connector with the key on. Missing voltage or ground means the harness or ECU side has the fault
- If wiring is good, swap in a known good FTP sensor and clear the code. Drive several cycles to confirm the intermittent fault has cleared
How much does P0454 cost to fix on a BMW? (EUR)
Estimated repair costs for P0454 in EUR, compiled across makes. Expect BMW parts and labour towards the upper end of each range.
Prices estimated as of March 2026. Costs vary by region, vehicle, and shop.
Codes related to P0454
These codes are often seen alongside P0454 or point to related issues, on any make:
Looking for the full P0454 reference (all makes, full diagnosis flow, complete repair cost matrix)?
See the main P0454 guideSkanyx · BMW
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