DPF
Diesel advice
What a DPF warning light can be telling you
Why regeneration can be interrupted and when carbon build-up deserves investigation.
Read guide →EGR
Engine air flow
Common signs of EGR carbon build-up
How soot around the EGR and intake can contribute to everyday running symptoms.
Read guide →H₂
Treatment
How hydrogen carbon cleaning works
What the non-invasive treatment is intended to do — and what it cannot repair.
Read guide →