Right part, first time
Live data separates a sticking valve from an air leak or a sensor.
Exhaust gas recirculation faults
EGR faults diagnosed — valves, coolers & solutions
Rough idle, smoke, loss of power, an engine light that keeps coming back — the EGR system is one of the most common causes on modern diesels. We test it properly and tell you whether it needs cleaning, a part or a calibration fix.
Live datanot guesswork
Clean or replacewe tell you which
On siteat home or work
EGR solutions
What goes wrong with EGR systems
The EGR valve feeds a measured amount of exhaust gas back into the intake to cut combustion temperature and NOx. Over time soot and oil vapour coke the valve and the intake, the valve sticks, and the engine management starts to complain.
Symptoms overlap with turbo, injector and DPF faults, which is why parts get replaced unnecessarily. We use live data — commanded versus actual valve position, air-mass readings, cooler temperatures — to pin it down before you spend money.
Most road cars need a clean, a valve or a cooler. For off-road, motorsport and export vehicles we can supply EGR solutions in software — never for a vehicle used on UK roads.
The law, plainly: removing or disabling a DPF, EGR or AdBlue/SCR system on a vehicle used on UK public roads is illegal and is an MOT failure. We diagnose and repair the fault first. Removal solutions are supplied only for off-road, motorsport and export vehicles, and we will ask you to confirm that before any work is done.
The result
Why diagnose before you buy parts
Lower bills
A clean is often enough where a new valve was quoted.
Protect the DPF
A healthy EGR system stops the particulate filter loading up.
Clear answers
You see what we see before deciding anything.
How it works
From first message to road test
- 01
Book a diagnosis
Tell us the car and the symptoms.
- 02
Test the system
Fault codes, valve position, air mass and temperatures.
- 03
Fix it properly
Clean, part or calibration — explained before we start.
Questions
EGR solutions — your questions answered
Can a dirty EGR valve be cleaned?
Often, yes — it depends how heavily coked it is and whether the motor or position sensor has failed. We test before advising.
Is EGR removal legal?
Not on a vehicle used on UK roads. EGR solutions are supplied only for off-road, motorsport and export vehicles.
Why does my EGR fault keep coming back?
Often because the cause — oil vapour, a breather problem or short journeys — has not been fixed. We look at the whole system.
Can a remap fix EGR faults?
Not a mechanical fault. A calibration can help with some driveability issues once the hardware is healthy.
Do you come to me?
Yes — diagnosis and most fixes are done at your home or workplace.
Mobile · we come to you
Get the EGR fault found, not guessed.
Send the reg and symptoms and we will book a diagnosis at your door.