What the exhaust system does
Your exhaust directs gases safely out of the engine, reduces noise, and helps emissions equipment do its job. On modern vehicles it may include catalytic converters, DPFs, oxygen/NOx sensors and AdBlue/SCR systems.
What we check
- Leaks, broken hangers and damaged joints
- Condition of silencers/back box and flexi sections
- Emissions-related faults (EGR/DPF/sensors) where applicable
- DPF soot load / regeneration history (vehicle dependent)
- Boost/exhaust leaks affecting performance
Common symptoms
- Loud exhaust, blowing noise, fumes
- Rattles under the car
- Engine management light, limp mode
- DPF warning light / frequent regens
- Strong smells or smoke
MOT relevance
MOT includes checking the exhaust for leaks/security and assessing emissions. If your system is blowing or the warning light is on, it’s worth checking before the test.
DPF note: A blocked DPF is often a symptom, not the root cause. We’ll look at the reason it’s not regenerating properly.