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Fix 3: Replace Glow Plug Control Module

If your 4-cylinder Peugeot shows P306D

, it is likely a generic communication error or a software glitch. Always verify with live data.

• 1.6 THP (EP6) – very prone to injector clogging and carbon on valves. P306D is almost always injector or carbon.
• 1.2 PureTech (EB2) – wet belt degrades, clogging oil strainer, then causing variable valve timing issues – can mimic P306D. Check oil pressure first.
• 1.6 HDi (diesel) – rare for P306D (usually glow plug or injector return line). If appears, suspect failed injector #3.

fuel economy, reliability, or modification

What is your main goal ()?

Sensor Contamination:

Dirt or oil on the throttle body sensor or the MAP (Manifold Absolute Pressure) sensor can cause mismatched readings.

Engine Management Light (EML):

The dashboard warning light activates.

Driving experience and long-term ownership

• Performance in naturally aspirated diesel variants was modest—acceleration was leisurely, but torque delivery at low RPMs made city-and-country driving manageable. Turbo diesel variants improved flexibility and responsiveness.
• Maintenance considerations: routine servicing, timing belt replacements (where applicable), and attention to the fuel system and injection components are essential for longevity. When well-maintained, 306 diesel engines can cover high mileages reliably.
• Common aging issues: corrosion on older examples (especially in climates with salted roads), wear to suspension bushings, and electrics/immobiliser faults on some late-1990s models.