A1 MOTORTECH ST ALBANS
DPF, EGR & AdBlue
Specialist DPF cleaning, EGR servicing and AdBlue system repairs for diesel vehicle owners in St Albans, Hemel Hempstead, Watford, Stevenage, Hatfield and Welwyn. A1 Motortech helps restore diesel emissions systems to correct operation.
DPF, EGR & AdBlue in St Albans
What you can expect when you book DPF, EGR & AdBlue with A1 Motortech.
DPF (diesel particulate filter) diagnostics, forced regeneration and cleaning
DPF pressure sensor, temperature sensor and lambda sensor replacement
EGR valve cleaning, repair and replacement for all diesel vehicles
EGR cooler inspection and replacement where required
AdBlue system diagnostics and fault code investigation
AdBlue pump, injector and NOx sensor repair and replacement
AdBlue system reprogramming and reset after component replacement
Serving St Albans, Hemel Hempstead, Watford, Stevenage, Hatfield and Welwyn
Frequently Asked Questions
A Diesel Particulate Filter (DPF) captures soot and particulate matter from your exhaust gases to reduce harmful emissions. Over time, the filter becomes blocked and must regenerate — either passively on long motorway runs or actively triggered by the engine management system. A blocked DPF will cause a warning light and, if left unaddressed, can lead to significant engine damage and an expensive replacement.
DPF blockages are most commonly caused by frequent short journeys that prevent the filter from reaching the temperature needed for passive regeneration. Low-quality fuel, a faulty EGR valve, oil contamination or a failing fuel injector can also contribute to premature DPF failure.
The Exhaust Gas Recirculation (EGR) valve recirculates a portion of exhaust gases back into the engine intake to reduce NOx emissions. EGR valves can stick open or closed due to carbon build-up, causing rough idling, poor performance and increased fuel consumption.
AdBlue is a diesel exhaust fluid used in Selective Catalytic Reduction (SCR) systems to reduce NOx emissions in diesel vehicles fitted with this technology. If AdBlue runs out completely, many vehicles will refuse to restart as a regulatory requirement. Warning lights will appear before it runs out to give you time to top up.
