2012 Peugeot 3008 1.6 HDi (SID807) – Persistent DPF Warning Despite Healthy Live Data

[Chrismileham]

I'm looking for some technical advice regarding a persistent DPF warning on my 2012 Peugeot 3008 1.6 HDi.

Symptoms

- "Risk of particle filter clogging" warning appears intermittently.
- Vehicle drives perfectly with no loss of power.
- No limp mode.
- Warning sometimes disappears by itself after the vehicle has been left overnight.

Diagnostics

I've recently installed Diagbox 7.57 with a Lexia interface.

A full Global Test completed successfully and the only engine fault present is:

P1490 – Particle Filter fault

No other engine faults are present.

Live DPF Data

With the engine running:

- Calculated soot load: approximately 0.44 g
- Estimated ash load: approximately 26 g
- Differential pressure across the DPF at idle: approximately 3 mbar

These figures suggest the DPF is flowing very well and is not physically blocked.

Other Information

- The vehicle is still consuming Eolys additive, indicating regeneration attempts are occurring.
- The engine starts instantly and runs smoothly.
- No excessive smoke.
- Fuel economy appears normal.
- Engine performance feels completely normal.

Diagbox Observation

Within the diagnostic information I also noticed a parameter reporting pre-heating glow plugs: non-activation.

As the engine starts immediately from cold, I'm unsure whether this simply means the ECU isn't requesting the glow plugs, or whether a glow plug fault could prevent regeneration while still allowing the engine to start normally.

Current Thoughts

Given the very low soot loading, modest ash loading and extremely low differential pressure, I don't currently believe the DPF itself is blocked.

I'm beginning to wonder whether:

- a previous regeneration has left a counter uncleared,
- the additive (Eolys) ECU or DPF ECU requires an adaptation or reset,
- there is a historical fault causing the warning,
- or another regeneration prerequisite is not being met.

I'm continuing to investigate with Diagbox and plan to examine the additive ECU, regeneration history and any DPF reset/adaptation functions.

Has anyone experienced P1490 with such low soot loading, low differential pressure and an apparently healthy DPF? If so, what was the eventual cause?

[PaulC5]

How many miles has the car done ? Something to read that might help, this P1490 turned out to be a blocked dpf viewtopic.php?t=70122

[Chrismileham]

187000 miles. I do have it booked into a performance centre for a dpf clean. But there is no real sign of blocked dpf, and everything else suggests healthy filter, even though the risk of dpf clogging warning comes and goes.