A common issue with Volkswagen TDI engines is a “Reductant Pressure Too Low” fault, often accompanied by a countdown to a “No Start” condition due to AdBlue system issues. This article will guide you on how to potentially reset the “Mileage to Reducing Agent Deficiency” countdown using VCDS.
This problem is frequently covered under warranty, especially for vehicles affected by the TDI settlement. However, securing a dealer appointment can take weeks or even months. In the interim, resetting the countdown can provide a temporary solution.
While some online resources suggest using Long Adaptation to reset the countdown (as shown in this video: https://www.youtube.com/watch?v=mNnL7U7LSoo), this option isn’t always available in VCDS. Furthermore, simply resetting the SCR Lock and other related settings in Basic Settings might not resolve the countdown issue.
One potential solution involves addressing the underlying fault code. In the example provided, the fault code “9645 – Reductant P20E8 00 [237] – Pressure too Low” indicates a problem with the AdBlue pressure sensor or pump. The freeze frame data reveals a measured pressure of 0 hPa from the reductant pressure sensor, confirming the low-pressure condition. Other relevant data points include:
- Mileage: 142780 km
- Engine RPM: 1743.50 /min
- Vehicle Speed: 73 km/h
- Reductant Pump Activation: 80.00%
- Reductant Injector Activation: 0.00%
Unfortunately, a Vcds Adblue Reset specifically for the countdown timer isn’t always straightforward and may not be possible without addressing the underlying fault. The absence of the Long Adaptation option further complicates the process.
While attempting to reset related SCR values in Basic Settings might offer a temporary fix, a comprehensive diagnosis and repair of the AdBlue system, including the faulty pressure sensor or pump, is the ultimate solution. Contact your dealer to expedite your warranty service appointment or consult with a qualified TDI specialist for immediate assistance. Driving with a faulty AdBlue system can lead to further damage and potentially impact the vehicle’s emissions compliance.
