Peugeot 5008 Dashboard Warning Light Bible (2026)

⚠️ Issue: Engine/emission fault. Common on 5008: 1.2 PureTech timing belt degradation (belt particles clog oil pick-up), 1.5 BlueHDi AdBlue system, O2 sensor, EVAP leak.

📋 Symptoms: Rough idle, loss of power, stop-start disabled, fuel smell, or no symptom.

🔍 EXTENDED DIAGNOSIS:

• Step 1 – OBD2 scan: Record all codes (P codes). Freeze frame data (RPM, coolant temp, load).
• Step 2 – 1.2 PureTech specific: Remove oil filler cap; if you see rubber particles, timing belt is disintegrating. Also check oil pressure with manual gauge.
• Step 3 – Live data: Monitor fuel trims (STFT & LTFT > ±10% = vacuum leak), O2 sensor switching, MAF g/s (3-7 g/s at idle).
• Step 4 – Smoke test: Pressurise intake system to find evap or vacuum leaks (common on 1.2/1.5).
• Step 5 – Coil pack test: Swap coils between cylinders to see if misfire moves.
• Step 6 – Fuel pressure test: High-pressure pump on diesel (1.5 BlueHDi common rail pressure faults).

💰 Repair cost: €80 (diagnosis) – €2500 (timing belt + engine flush + oil pump if 1.2 PureTech severe)

⚠️ Issue: Wheel speed sensor, tone ring, or ABS pump. Rear sensors on 5008 suffer from corrosion.

📋 Symptoms: ABS light on, speedometer may drop, hill start assist inactive.

🔍 DIAGNOSIS:

• Scan ABS codes (C1300, C1310 etc). Check live data for each wheel speed while driving – erratic reading = bad sensor or ring.
• Remove rear sensor, inspect tip for metal debris. Measure resistance (800-2000 ohms typically).
• Inspect tone rings on rear hubs for cracks or rust build-up (common).
• Check ABS module fuse and relay. On some 5008, pump motor can fail internally.

💰 Cost: €80 (sensor) – €450 (ABS pump rebuild)

⚠️ Issue: Faulty seat occupancy sensor (passenger), clock spring, or belt tensioner. Common under-seat connector corrosion.

📋 Symptoms: Airbag light stays on, passenger airbag off light may flash.

🔍 DIAGNOSIS:

• Use SRS-capable scanner (Diagbox) – read codes B1xxx. Look for “front passenger seat occupancy sensor” high resistance.
• Inspect yellow connectors under front seats – disconnect, clean with contact cleaner, apply dielectric grease.
• Clock spring test: check continuity between steering wheel harness (horn, cruise control). If no continuity, replace.
• Pretensioner resistance check: 2-5 ohms (never use multimeter on deployed unit).

💰 Cost: €90 (clean contacts) – €600 (occupancy mat + labour)

⚠️ Issue: Low pressure, sensor dead, or indirect system needs reset. 5008 after 2015 uses indirect ABS-based system (no internal sensors) but some have direct sensors.

📋 Symptoms: Light on after driving, no pressure displayed.

🔍 DIAGNOSIS:

• Set all tyres to correct pressure, then reset via touchscreen (Driving / Tyre pressure reset). If light stays, system has fault.
• For indirect: check wheel speed sensor data – if one wheel shows different speed, may be due to wrong tyre size or sensor issue.
• For direct sensors: use TPMS tool to trigger each sensor (ID and pressure). Replace dead sensor (battery life 5-7 years).

💰 Cost: €0 (reset) – €250 (set of 4 sensors + coding)

⚠️ Issue: Low AdBlue, faulty NOx sensor, pump failure, or tank crystallisation. 5008 BlueHDi models: AdBlue heater failure (wiring harness chafing).

📋 Symptoms: Countdown distance (engine start prevented after 0 km), reduced power, warning beep.

🔍 DIAGNOSIS:

• Top up with quality AdBlue. If light remains, read codes (P20E8, P204F). Check freeze frame.
• Inspect AdBlue tank wiring harness under vehicle – common chafing causing heater short.
• Test NOx sensors (upstream/downstream) using diagnostic graphing.
• Check AdBlue injector (doser) for blockage using endoscope.
• Perform tank heater resistance test (4-8 ohms).

💰 Cost: €15 (AdBlue) – €1400 (tank + pump + labour)

⚠️ Issue: Filter blocked, differential pressure sensor failed, additive (Eolys) low. 5008 1.6/2.0 HDi: frequent short trips prevent regeneration.

📋 Symptoms: Reduced power, high oil level (fuel dilution), regeneration too frequent.

🔍 DIAGNOSIS:

• Read soot load (g/l) and ash load via scan tool. >40g/l = blocked.
• Check differential pressure sensor hoses for blockage/leak. Voltage at idle ~0.3-0.5V, at 3000rpm ~1.5-2.5V.
• Check additive level (Eolys) – reservoir behind left rear wheel. Low level prevents regeneration.
• Perform forced regeneration (requires Diagbox with engine >80°C, driving or stationary).

💰 Cost: €80 (forced regen) – €1600 (DPF + additive tank)

⚠️ Issue: One or more glow plugs failed, relay stuck, or control module faulty. Hard cold start, white smoke.

🔍 DIAGNOSIS:

• Measure resistance each plug (terminal to engine ground). 0.5-2 ohms good, OL = open, 0 = short.
• Check glow plug relay: listen for click when ignition on (cold engine). Use multimeter at plug connector: 12V for few seconds after ignition.
• Scan for glow control module codes – some 5008 have separate module near battery.

💰 Cost: €40 (DIY) – €250 (all plugs + relay)

⚠️ Issue: System not available – battery low, sensor fault, or engine not ready.

📋 Symptoms: ECO light off or flashing, message “Stop‑start not available”.

🔍 DIAGNOSIS:

• Check battery state of charge (needs >75%) and condition (AGM battery test).
• Scan BSI for “stop‑start inhibited” codes – often due to brake pedal switch or steering angle sensor.
• Check voltage at battery current sensor (LIN bus communication).

💰 Cost: €120 (battery) – €300 (current sensor)

⚠️ Issue: Faulty latch switch, broken wire in tailgate hinge boot (common).

📋 Symptoms: Light on with all doors closed, interior lights stay on, alarm won’t set.

🔍 DIAGNOSIS:

• Identify which door via instrument panel display (if equipped).
• Open tailgate and inspect rubber boot between body and tailgate – look for broken wires (usually black/white). Repair with solder.
• Test latch microswitch with multimeter (open/close continuity).

💰 Cost: €20 (solder) – €180 (latch assembly)

⚠️ Issue: Front or rear pads below 3mm, wear sensor wire broken.

📋 Symptoms: Light on, sometimes “check brake pads” message.

🔍 DIAGNOSIS: Visually inspect pads through caliper. Check sensor continuity (two wires, closed loop when not worn, open when worn). Replace pads and sensor.

💰 Cost: €120 (front pads + sensor) – €350 (all pads + discs)

⚠️ Issue: Gasoline particulate filter clogged (mainly 1.2 PureTech GPF). Short trips cause soot buildup.

📋 Symptoms: Reduced power, warning light, regeneration active message.

🔍 DIAGNOSIS: Scan for differential pressure sensor values, perform forced regen. Check if oil overfilled (fuel dilution).

💰 Cost: €100 (forced regen) – €1200 (GPF replacement)

⚠️ Issue: Blown bulb (low beam, tail light, indicator) or LED module failure.

📋 Symptoms: Message “Check dipped beam”, light on dash.

🔍 DIAGNOSIS: Visually inspect all exterior lights. On full LED headlights, scan BSI for failure (often requires headlight replacement).

💰 Cost: €10 (bulb) – €800 (LED headlight unit)