After extensive cross-referencing with OEM (Original Equipment Manufacturer) catalogs and aftermarket supplier databases (including Bosch, Valeo, and Sogefi), the identifier Peugeot 098C most commonly points to one of three things:
For the purpose of this deep-dive, we will focus primarily on the starter motor interpretation, as it is the most common and actionable search intent behind the keyword.
While the 098C never saw production, its DNA reappeared in fragmented form:
If you are a hobbyist, you can rebuild the 098C. Kits are available for €15–€25. peugeot 098c
For completeness, we must address the second meaning. If you plug a Peugeot Planet 2000 (PP2000) diagnostic tool into a 2001–2008 Peugeot (like a 607 or 807), you might see a fault log reading: "BSI fault: 098C - Intermittent communication with comfort VAN".
In this context, Peugeot 098C is a hexadecimal error code. It indicates that the Body Control Module (BSI) lost contact with the climate control panel or the window lift module.
Solution to this error:
Instructions: Answer all questions. Write clearly; show calculations or reasoning where applicable. Total time: 90 minutes. Total marks: 100.
Section A — Short answer (20 marks — 2 marks each)
Section B — Technical knowledge (30 marks)
6. Explain the typical operation and purpose of a common-rail diesel fuel system (8 marks). Include a simple labelled diagram (describe labels in words).
7. Describe the function and failure symptoms of a diesel particulate filter (DPF) and outline one safe method to attempt regeneration and one reason forced regeneration may be necessary (8 marks).
8. Explain how turbocharger issues can affect engine performance and list three diagnostic checks you would perform to confirm turbo health (6 marks).
9. Describe the role of the mass airflow (MAF) sensor and how a faulty MAF can impact fuel-air mixture (8 marks). For the purpose of this deep-dive, we will
Section C — Fault finding and practical tasks (30 marks)
10. You receive a Peugeot with the 098C designation complaining of rough idle, low power, and a DPF warning light. Outline a step-by-step diagnostic procedure (include tests, expected readings, and pass/fail criteria). (12 marks)
Example steps to include: visual inspection, OBD scan, live-data checks (rail pressure, EGTs, boost pressure), smoke/leak tests, DPF differential pressure sensor reading, test drive to observe regeneration behavior.
Section D — Practical knowledge and calculations (20 marks)
13. Given: a common-rail system shows measured rail pressure of 300 bar at idle when the specified nominal rail pressure at idle should be 700 bar. List five possible causes and describe one prioritised test to identify the cause. (8 marks)
14. A DPF differential pressure sensor shows 200 mbar at idle and 1200 mbar under steady highway speed (values hypothetical). Interpret these readings and state whether DPF is likely blocked; recommend immediate action. Show reasoning. (6 marks)
15. Calculate: If a turbocharger produces 0.6 bar boost and atmospheric pressure is 1.0 bar, what is the absolute intake manifold pressure? If the engine’s displacement is 2.0 L and the volumetric efficiency at that boost is 110%, compute the effective air mass entering per intake stroke (assume air density 1.2 kg/m^3 and 4-stroke engine). Show formulas and result. (6 marks)
Answer sheet: space for answers provided beneath each question (not included here). Section B — Technical knowledge (30 marks) 6