If your Renault Trafic or Vauxhall Vivaro has suddenly displayed “Check Injection” or “Check Anti Pollution System”, many people immediately assume the worst:
- DPF failure
- Injector problems
- Turbo failure
- Expensive repairs
While those faults can trigger these warnings, there’s one surprisingly common cause that is often overlooked:
A Blocked Upstream Turbo Pressure Sensor Pipe
On many Renault Trafic / Vauxhall Vivaro 1.6 diesel models, we regularly see these warnings caused by a simple blockage in the small upstream turbo pressure sensor pipe.
Over time, soot and carbon deposits can restrict or completely block this pipe, preventing the pressure sensor from reading correctly.
When this happens, the ECU receives false boost pressure data and assumes there is a serious injection or emissions fault.
This can trigger:
- Check Injection
- Check Anti Pollution
- Engine management warning light
- Reduced engine power
- Limp mode
Why It Gets Misdiagnosed
Because the dashboard message sounds serious, many owners (and sometimes even garages) jump straight to replacing expensive parts like:
- Injectors
- DPF sensors
- EGR valves
- Turbo components
- DPF cleaning
when the real issue may simply be incorrect pressure readings caused by a blocked sensor feed.
Common Symptoms
If this is your issue, you may notice:
- Loss of power
- Intermittent limp mode
- Warning lights appearing under acceleration
- Poor boost response
- Fault codes relating to boost pressure or injection
Proper Diagnosis Matters
This is exactly why proper diagnostics are critical.
At Carbon Clean Co, we don’t rely on guesswork.
Our diagnostic process includes:
- Full fault code diagnostics
- Live boost pressure analysis
- Pressure testing for leaks
- Sensor checks
- DPF system assessment
- Emissions fault diagnosis
This allows us to identify the real cause before expensive parts are replaced unnecessarily.
Mobile Diagnostics for Renault Trafic & Vauxhall Vivaro
If your van is showing Check Injection or Check Anti Pollution, don’t assume the worst.
Carbon Clean Co provides professional mobile diagnostics and emissions fault finding across Leicester, Nottingham, Derby, and surrounding areas.
Sometimes the fault is far simpler — and far cheaper — than people expect.