FAQs

In many cases, if a reputable DPF Cleaner additive is added to the fuel soon after the DPF warning light is triggered, the light will clear during subsequent driving. This is in response to a reduction in the soot loading in the DPF due to efficient regeneration enabled by the catalyst particles provided by the additive. However, there are a few scenarios in which a DPF additive would not put out the warning light:

1. If there is a mechanical problem with the DPF. For example, if the filter has been physically damaged or if there is a fault with one of the sensors.
2. If it has been left too late. If an overwhelmingly large amount of soot has built up in the filter then it may not be possible to regenerate using an additive alone. The DPF may need to be removed from the vehicle for an external cleaning treatment.
3. If the problem is due to significant ash build up in the filter. Over long-term use, the DPF will accumulate incombustible ash (mostly from the engine oil). As a result, an external clean may be required every 100,000 miles or so.
4. In some vehicles the DPF warning light will not clear by itself, even if there is no longer a problem. In this case, the vehicle will need to be taken to a workshop for the warning light to be reset.

In most cases, it would be worth trying a DPF Additive to solve a DPF problem indicated by the warning light. If this proves insufficient to clear the warning light, then more expensive and time-consuming solutions would need to be considered.