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BMW fault code 190F08: fuel tank ventilation fault
Tank ventilation fault. What the code means, its most common causes and what to do.
Codes in this family
Six-digit BMW codes stored by the engine control unit (DME). The same code appears in this form in ISTA and in the MOSTUNED app.
| Code | Meaning |
|---|---|
| 190F08 | Fuel tank ventilation system: Malfunction |
| 190302 | Fuel tank ventilation system and purge air system: Micro-leak greater than 0.5 mm detected |
| 191001 | Tank vent valve, activation: Short circuit to B+ |
| 191002 | Tank vent valve, activation: Short circuit to ground |
| 191004 | Tank vent valve, activation: Open circuit |
What does 190F08 mean?
Fuel vapour from the tank is collected in a charcoal canister, and the tank vent valve feeds it to the engine in a controlled way. The DME tests the system for leaks and checks the valve. If it finds a leak or a valve fault, these codes are stored.
Most common causes
Top to bottom, starting with what is easiest to check.
| Cause | What to check |
|---|---|
| Fuel cap | A cap not fully closed or with a worn seal is the simplest cause of a micro-leak code. |
| Tank vent valve | A valve stuck open also affects the mixture; for electrical codes, the valve and wiring are checked. |
| Hoses | Cracked or loose hoses between the valve and the intake. |
Can you drive with this code?
It usually does not affect driving; if there is a fuel smell or a mixture code alongside it, have it checked without delay.
How it relates to tuning
Tuning does not touch the tank ventilation system. Because a valve stuck open can upset the mixture, we ask for this code to be cleared before tuning.
Read the code yourself, free
- 1 Install MOSTUNED on your iPhone.
- 2 Connect to the car with an ENET cable or WiFi-ENET adapter.
- 3 Open “Fault Codes” under Diagnostics; stored codes are listed with their descriptions.
- 4 Note the code, fix the cause, then clear it from the same screen and read again to confirm.
Frequently asked questions
What does BMW fault code 190F08 mean?
Fuel vapour from the tank is collected in a charcoal canister, and the tank vent valve feeds it to the engine in a controlled way. The DME tests the system for leaks and checks the valve. If it finds a leak or a valve fault, these codes are stored.
Can I drive with code 190F08?
It usually does not affect driving; if there is a fuel smell or a mixture code alongside it, have it checked without delay.
Does clearing 190F08 fix the problem?
Clearing removes the entry, not the cause. If the cause remains, the code returns when the conditions occur again. The right order is: read the code, fix the cause, clear it and read again to confirm.
How do I read code 190F08?
You read it for free with the MOSTUNED app: connect your iPhone to the car with an ENET cable or WiFi-ENET adapter and open Fault Codes under Diagnostics. Bluetooth OBD (ELM327) adapters do not provide this connection.
Does tuning cause this code?
Tuning does not touch the tank ventilation system. Because a valve stuck open can upset the mixture, we ask for this code to be cleared before tuning.
I cannot find the cause. What should I do?
Send us your car model, the code and a Logger recording if you have one on WhatsApp and we will look at it together. Related codes: 190302, 191001, 191002, 191004.
Next step
- All BMW fault codes — B48 / G-series code guide
- Download the app — Fault reading and clearing are free
- ENET cable and adapter guide — What you need to connect
- Using the Logger — Narrow down the cause with live data
- BMW 320i 300 HP — Torque, 100–200 and price
- BMW 320i tuning — €750 package in Ataşehir
- BMW 520i tuning — G30
- Blog — Tuning guides
Contact
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