This 2017 Peugeot 3008 was scanned before and after dealer repair. Several important systems reported normally afterwards, but faults concerning the diesel fuel-additive/PAT pump and additive circuit were still recorded. The job was to establish what the evidence showed—not to call the vehicle fixed because some warnings had changed.
What the comparison established
The pre-repair scan recorded 29 issues at 100,970 miles. The later scan recorded 32 entries at approximately 102,099 miles. Those totals cannot be treated as a simple score: some entries may be stored communication events, and the useful evidence lies in which systems changed and which faults remained.
What improved after dealer repair
The later diagnostic report showed normal status for the engine ECU, gearbox, airbags and electric power steering. That was meaningful improvement, but it did not make the complete post-repair scan clean.
What remained unresolved
Diesel fuel-additive/PAT pump and additive-circuit faults were recorded before and after the dealer repair. A fault entry does not automatically prove that the named component has failed, but a persistent entry does justify targeted diagnosis.
The evidence-led next step
The report recommended diagnosing the additive/PAT system, assessing DPF live data, reviewing relevant network and BSI events, then clearing faults, road-testing and rescanning. It did not prove that the DPF was blocked or authorise automatic parts replacement.
The lesson
A dashboard improvement and a completed repair are not always the same thing. Comparing scans can show what changed, what did not and where the next diagnostic work should begin.
QUESTIONS THIS CASE ANSWERS
Questions this case helps answer
What is a Peugeot diesel-additive or PAT pump fault?
It is a recorded fault relating to the fuel-additive system used to support diesel particulate-filter operation on applicable vehicles. The code guides testing; it does not prove the pump itself must be replaced.
Does an additive-system fault mean the DPF is blocked?
No. The diagnostic report in this case did not prove that the DPF was blocked. DPF live data and the additive system should be assessed before recommending cleaning or replacement.
Why compare diagnostic scans before and after a repair?
A comparison separates faults that have cleared from those that persist and helps prevent an improved dashboard from being mistaken for a fully verified repair.