'I’m a mechanic – making this simple mistake could be extremely costly for drivers'

Expert Mechanic Warns Diesel Owners of Costly AdBlue System Mistake

Diesel vehicle owners are being cautioned against a common error this spring that could lead to significant damage and expensive repairs to their AdBlue systems. A prominent mechanic, Craig from Walsall Wood Tyre and Service, has emphasized that attempting to economize by incorrectly managing a vehicle’s AdBlue system can result in serious and unforeseen complications.

Risks of Substituting Water for AdBlue Solution

Craig alerted motorists that introducing water into the AdBlue tank instead of the designated AdBlue solution can cause substantial problems within their vehicles. This action is likely to trigger fault codes, necessitating professional intervention. Garages are expected to levy considerable charges for diagnosing and rectifying issues arising from water contamination in the AdBlue system, presenting a financial setback for vehicle owners. The warning was initially shared by Craig and Walsall Wood on TikTok, a platform they utilize to provide regular guidance and address queries from drivers.

Mechanic’s Explanation of AdBlue System Vulnerability

In response to a motorist’s query about the potential consequences of using water in place of AdBlue, Craig clarified the system’s sensitivity. He stated, “Yes, the car will detect the difference. When the system injects fluid and monitors the nitrogen oxide (NOx) levels in the exhaust, it anticipates a reduction in these emissions. Introducing water instead of AdBlue will fail to achieve this reduction.”

Expected Fault Codes and Repair Expenses

Craig further explained the likely outcome of using water:

• “This will trigger the common fault code P2OEE, indicating a general denox system malfunction.”
• “Subsequently, determining the cause of the fault and initiating repairs can become a costly undertaking for the vehicle owner.”
• “Therefore, it is strongly advised against introducing water into your AdBlue system. It will not function as intended, and correcting the resulting issues will incur significant charges.”

Understanding Modern Diesel AdBlue Systems

AdBlue systems are integrated into numerous contemporary diesel vehicles manufactured after September 2015. This technology serves as an emissions control measure, designed to diminish harmful nitrogen oxide emissions released from the vehicle’s exhaust.

Accessibility and Importance of AdBlue

AdBlue is readily available throughout the UK, accessible to motorists at petrol stations, vehicle service centers, and automotive retail outlets.

Consequences of Depleted AdBlue Levels

Automotive experts at the AA (Automobile Association) emphasize the importance of maintaining adequate AdBlue levels. Operating a vehicle with an empty AdBlue tank can lead to performance compromises. The AA stated, “If you deplete your AdBlue supply while driving, the engine’s power and overall performance will be diminished to restrict emissions output. Critically, once the engine is switched off with an empty AdBlue tank, it will be impossible to restart until the system is replenished.”