EGR Diagnostics & Repairs in Sunbury-on-Thames
The exhaust gas recirculation system feeds a controlled amount of exhaust back into the intake to reduce NOx emissions. Carbon build-up and sticking valves are common, especially on diesels.
We diagnose EGR faults and repair them correctly.
Common signs
Symptoms worth checking
- Engine warning light
- Hesitation or poor performance
- Rough idle
- Black smoke
- Coolant loss on engines with EGR coolers
What an EGR valve does
By lowering combustion temperatures, EGR reduces NOx. If the valve sticks open or closed, or the cooler leaks, running and emissions suffer.
Cleaning can help in some cases; replacement is needed in others.
What we check
- EGR valve position data
- Carbon build-up
- EGR cooler leaks
- Intake condition
What we can do
- EGR valve cleaning or replacement
- EGR cooler replacement
- Intake decarbonising where needed
How it works
The process
- 01
Scan and test.
- 02
Inspect.
- 03
Repair.
- 04
Verify.
Why The Factory
Main-dealer capability, independent service
A Master Technician-led workshop with seven mechanical ramps, a dedicated MOT ramp and dealer-level diagnostics. Faults are shown to you and additional work is quoted before it goes ahead.
We stand behind the work we carry out. Parts and workmanship are covered in accordance with your statutory rights and any applicable manufacturer or supplier warranty. Please ask us for details relevant to your repair.
- Diesel diagnostics
Free local collection & return
Available by arrangement within approximately five miles of our Sunbury-on-Thames workshop. Further afield? Just ask us.
FAQs
EGR Repairs: your questions answered
What does an EGR valve do?
It recirculates exhaust gas into the intake to reduce NOx emissions.
What are the symptoms of an EGR fault?
Warning lights, hesitation, rough idle and smoke.
Can a faulty EGR cause poor performance?
Yes.
Can EGR faults trigger an engine warning light?
Yes.
Do you delete EGR systems?
No. We diagnose and repair EGR systems correctly and do not delete or code out emissions equipment.
Related services
DPF Diagnostics & Cleaning
Proper diagnosis of DPF warnings, cleaning and repair — never deletion.
AdBlue / SCR Repairs
Legitimate diagnosis and repair of AdBlue warnings and countdowns.
Emissions Diagnostics
MOT emissions failures, smoke and emissions warnings diagnosed.
Need help with egr repairs?
Send your registration and a quick description on WhatsApp, or call the workshop.
The Factory, Harris Way, Sunbury-on-Thames TW16 7EL