5 Signs Your DPF Could Be Blocked And What to Do Next

If you drive a diesel car or van it’s important to know how your vehicle’s Diesel Particulate Filter (DPF) works – and what can go wrong if it becomes blocked. A DPF is designed to trap and remove harmful soot particles from your exhaust emissions, helping to reduce pollution. However, if the filter becomes clogged, it can cause a range of issues that affect your vehicle’s performance and reliability. At Peter Watson Garage, we are proud members of The DPF Doctor Network, a nationwide group of specialists in DPF diagnostics and repairs. This means we are fully trained and equipped to properly assess and resolve any DPF problems before they become more serious – and costly. In this blog, we’ll explain five common signs that your DPF could be blocked, and what you should do next if you notice them.

1. Warning Lights on the Dashboard

One of the first and most obvious signs of a DPF issue is a warning light on your dashboard. Many vehicles have a dedicated DPF warning light, which typically looks like a box with dots inside it. You might also see the engine management light appear if the blockage is more severe. If you notice either of these warning lights, it’s essential not to ignore them. Continuing to drive with a DPF warning can lead to the vehicle going into limp mode to protect the engine, significantly limiting performance and requiring urgent attention.

2. Loss of Power and Poor Performance

A blocked DPF can have a direct impact on how your vehicle drives. You might notice a lack of power when accelerating, slower throttle response, or a general sluggishness that wasn’t there before. This happens because a clogged DPF increases back pressure in the exhaust system, making it harder for your engine to breathe properly. In some cases, your vehicle might feel as though it is struggling or being held back, particularly when driving uphill or carrying a heavy load. If you notice any loss of performance, it’s important to get it checked out before further damage is done.

3. Strange Smells from the Exhaust

Another sign that your DPF might be blocked is a strange smell coming from the exhaust. When soot builds up and cannot properly regenerate or burn off, it can produce a noticeable odour, often described as hot, acrid, or oily. This can be particularly noticeable when the vehicle is stationary or shortly after starting a journey. If you notice any unusual smells that you haven’t experienced before, it could be an early warning that your DPF needs professional attention.

4. Increased Fuel Consumption

If you’ve found yourself filling up the tank more often than usual, a blocked DPF could be the culprit. When the DPF is clogged, your engine has to work harder to force exhaust gases through the filter, leading to a noticeable drop in fuel efficiency. You might notice that your miles per gallon (MPG) has decreased, or that your range is significantly less than you would normally expect for the same amount of driving. Keeping an eye on your fuel consumption can be a useful early indicator that something isn’t quite right with your vehicle’s emissions system.

5. Difficulty Starting the Vehicle

In more severe cases, a badly blocked DPF can even make it difficult to start your vehicle. This is because the exhaust gases are unable to flow freely, putting additional strain on the engine during ignition. If your diesel car or van is becoming hard to start – particularly when it previously had no issues – it’s important to get it looked at quickly.

What to Do Next

If you notice any of these warning signs, the best thing you can do is to have your DPF assessed by a trained specialist. At Peter Watson Garage, our expert team have the right knowledge and uses advanced diagnostic equipment to perform a thorough DPF Assessment, identifying the root cause of the problem and recommending the most effective solution. Whether your DPF needs a clean, replacement or whether another fault is causing your DPF to block, you can trust us to give you honest advice and high-quality service. Thanks to our membership of The DPF Doctor Network, you can be confident that your vehicle is in the safest hands.

Final Thoughts

Blocked DPFs are a common problem, especially for drivers making lots of short journeys. However, catching the issue early can prevent more serious damage and save you money in the long run. If you suspect your DPF might be blocked, don’t wait for it to get worse – get in touch with Peter Watson Garage today to book your expert DPF Assessment. Based in Skipton and trusted by drivers across the Dales and surrounding villages, we offer honest advice and reliable solutions for all kinds of car issues, from diagnostics to general servicing and MOTs. Contact us today to book your next service and/or MOT by using our online form or calling us on 01756 792911.