Code P0402 reports excessively low air flow in the EGR circuit. On the Citroën Berlingo 1.6 HDi it shows up as a loss of performance and the engine warning light coming on.
- System
- Fuel injection
- Component
- Wastegate actuator hose and turbocharger boost pressure control hose
- Fault
- Loss of performance, with the engine warning light coming on.
- Typical symptoms
-
- Loss of performance
- Engine warning light on
- Vehicles affected
-
- Citroën Berlingo 1.6 HDi
- Main code
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- P0402 EGR circuit, air flow too low
- Solution
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See the repair procedure verified on Sema Repair.
The cause and the repair are on Sema Repair
On Sema Repair this code is linked to verified case studies, with the confirmed cause case by case, the job step by step, indicative times, the manufacturer's notes and a photograph of the component with the point of intervention highlighted.
Frequently asked questions about P0402
Does P0402 mean the EGR valve is dirty?
That is the first assumption and it is often the wrong one. The code says the flow measured in the EGR circuit does not match the expected value: the valve is one of the components that can cause this, not the only one.
Does cleaning the EGR valve fix it?
If the valve is not the cause, the code comes back after a few drive cycles with the valve clean and the invoice already written. On the Citroën Berlingo 1.6 HDi the documented case points elsewhere.
Can the vehicle be driven with P0402 active?
The vehicle is driveable, with a noticeable loss of performance. The repair should be scheduled, not postponed indefinitely.