AdBlue Repair and Delete in Dorking

The most common issue is a persistent AdBlue warning light, often amber or red. This indicates the system has detected a fault.

It could be a simple fluid level issue, but it frequently points to a deeper problem with a sensor, the pump, or the injector. Ignoring this light is not advisable as it will almost certainly lead to a more severe warning, such as a no start countdown.

We can diagnose the specific fault code and recommend the correct AdBlue repair.

This is the SCR system's most severe warning. The vehicle will display a message indicating it will not restart after a certain number of miles or ignition cycles.

This is designed to force the driver to seek a repair and prevent the vehicle from being driven with a non-compliant emissions system. If you see this warning, contact us immediately.

We can often reset the system and perform a permanent fix or AdBlue delete on site, preventing the non-start event.

The SCR system uses one or more NOx sensors to measure the level of nitrogen oxides in the exhaust gas, both before and after the catalyst. This data is used to calculate the correct amount of AdBlue to inject.

These sensors are exposed to extreme temperatures and can fail, sending incorrect data to the ECU. A faulty NOx sensor is a common cause of AdBlue system errors and requires specialist diagnosis to confirm before replacement.

The AdBlue fluid can crystallise over time, especially with low-quality fluid or in cold temperatures. These crystals can block the delicate pump mechanism or the fine nozzle of the injector.

This prevents the correct amount of fluid from reaching the exhaust, leading to an SCR efficiency fault. We can test these components and, in some cases, clean them, though often a replacement is the most reliable AdBlue solution.

The ECU constantly monitors the effectiveness of the SCR catalyst by comparing readings from the pre-catalyst and post-catalyst NOx sensors. If the reduction in NOx is below the expected threshold, it will log a fault code for "catalyst efficiency".

This can be due to a genuine catalyst failure, but it is often triggered by an upstream issue like a faulty injector or sensor providing inaccurate data. A proper diagnosis is key.

The dosing module or control unit is the brain of the AdBlue system. It communicates with the main engine ECU and controls the pump, heater, and injectors.

Like any electronic component, these modules can fail, causing a complete breakdown in SCR system operation. We have the equipment to test these modules and determine if they are the source of your AdBlue fault.

In many cases, we can reprogram or replace them on site.

It is not uncommon for customers to contact us after visiting a main dealer. A dealer might replace one component, such as a NOx sensor, only for the warning light to reappear soon after.

This often happens when the true root cause was not correctly identified. Our comprehensive diagnostic approach aims to find the primary fault, saving you time and the cost of replacing parts unnecessarily.

We get the job done right the first time.

AdBlue fluid begins to freeze at minus 11 degrees Celsius. To combat this, SCR systems are fitted with heaters in the tank and lines.

If one of these heaters fails, the fluid can freeze and crystallise, causing blockages and sometimes damaging the pump. This is a common problem during UK winters and requires a thorough check of the entire heating circuit to resolve properly.