What does the Volkswagen fault code 'Incorrect Throughput in Fuel Tank Exhaust System' mean?
2 Answers
Leakage or blockage in the activated carbon canister. Reading method: The fault code is displayed using the flashing pattern of the 'Check Engine' light on the dashboard. Most electronic control fuel injection system fault codes are displayed this way. When the system enters the fault code reading state, the self-diagnosis system controls the number of flashes and the duration of the 'Check Engine (CHECK ENGINE)' light to indicate the fault code. Decoder: The car dashboard will display some basic fault indications, but these are only a small part. The main faults need to be read using an instrument—a decoder. There are many types of decoders, such as the X-43KT300, but their working principles and the faults they read are the same.
When your Volkswagen displays this fault code, I understand you might feel a bit confused. The fuel tank venting system is actually the part that prevents gasoline vapors from escaping randomly, acting as the car's environmental guardian. An incorrect flow rate usually indicates poor gas circulation or a leak. Common causes could be dust or debris clogging the vent, or a faulty valve causing gas blockage. If ignored, it might lead to increased fuel consumption or a persistent emission warning light—seemingly minor but impactful. I recommend first checking if the fuel cap is securely tightened, as a loose cap can sometimes trigger false alarms. If the issue persists, it's best to visit a professional repair shop for diagnosis—they can pinpoint the exact fault code faster using scanning tools. Remember, this system is delicate, so avoid disassembling it yourself to prevent further issues.
