Symptoms of a faulty DPF and EGR
What is a EGR?
In a diesel engine-air mixture which burns with a surplus of oxygen, NOx is released. NOx is harmful to the environment and emissions from new engines must be reduced according to the directives.
By feeding back a portion of the exhaust gases that are low in oxygen, the combustion temperature is reduced which in turn decreases NOx emissions. The EGR actually works in part load, if for example the vehicle is set to 100 km/h on the cruise control. At full load, the valve is simply closed.
Due to the action of the EGR, the combustion in the engine is less complete (e.g. because of reduced oxygen content), which may lead to the occurrence of more hydrocarbons, and therefore more particles. This leads to the build-up of a lot of deposits in the intake manifold and EGR regulating valve, sometimes so much so that engine failure reports and other problems appear. The regulating valve will tend to remain suspended and then remain in the open position, so that also during full load, a lot of exhaust gases will be incorporated into the combustion air. This is how accelerating with a diesel vehicle produces the notorious black soot plume.
What is a DPF?
A DPF (Diesel Particulate filter) is a filter on your exhaust that is used to remove soot particles from the engine prior to exhausting into the atmosphere, it’s a metal box that looks like an exhaust silencer e.g back box or resonator.
If your DPF is working correctly it can remove around 85% of soot particles from your engine, sometimes even 100%.
To remove this soot that has been filtered and is now sitting in the dpf the car will perform a DPF regeneration.
This is done either by using a Catalyst or a fuel burner which heats to over 600c to oxidize the accumulated ash.
What problems do a EGR and DPF cause?
Due to your EGR staying open this can cause several issues for your vehicle.
One is lack of performance, you may notice your vehicle is less powerful than it was and this could be the reason why.
This is the same with a blocked DPF once the DPF senses that its blocked you should get an engine management light on the dash and the car will go into limp mode.
They can both also cause a drop in fuel efficiency, especially when underpowered as your always putting your foot to the floor to make up for a lack of power.
A blocked DPF can cause lasting damage to your turbocharger as well, as the heat cannot be expelled from the engine quick enough this heats up the housing around the turbo causing leaks.
What are the solutions to EGR and DPF issues?
With an EGR you can replace them, however, this is often expensive due to the labour and parts involved you’re also never guaranteed to not have an issue with it again.
We offer an EGR delete service which guarantees you will never have an EGR problem with your vehicle again. Your vehicle will still pass your MOT fine and emissions will not be affected.
With a DPF your first option should be a motorway run. Take your vehicle on the motorway for an hour’s run to try and clear the DPF.
If this doesn’t work then there are 2 options.
1. Take it to a garage and get it replaced.
2. We can remove it and map the DPF out of your ECU leaving you with n0 DPF problems ever again. To do this we initially take the DPF off of your vehicle, cut across the top of the DPF, and remove the internal filter, as well as any soot build-up.
We then reprogram the ECU by telling it, it doesn’t have a DPF so therefore by the car thinking there is no DPF, it won’t give you any DPF problems! All our work is carried out to the highest standard.
Please note this is strictly for off-road use vehicles only!
By deleting your DPF you will have the following advantages:
- Better fuel economy
- Increased performance
- No more DPF issues
- A longer lasting engine
DPF Fault Codes Fix
Fault Codes Fix:
- P0472 Diesel Particle Filter Differential Pressure Sensor – Signal too low – Defective
- P2453 Diesel Particle Filter Differential Pressure Sensor
- P2002 Particulate Trap Bank 1 Efficiency Below Threshold
- P2452 Diesel Particle Filter Differential Pressure Sensor
- P2463 Diesel Particle Filter Restriction: Soot Accumulation
- P2458 Diesel Particulate Filter – Regeneration Duration
- P2454 Diesel Particle Filter Differential Pressure Sensor