#warning lights
10 posts in Car Diagnostics blog about "warning lights" — OBD-II diagnostics, DTC codes, repair. ← All posts
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ABS and traction lights on together: one sensor, three warnings
Several lamps arriving at once looks like several faults. It almost never is — they share one data source, and finding which wheel is lying takes ten minutes.
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AdBlue warning countdown: what happens when it reaches zero
The countdown is not a suggestion. At zero the engine will not restart, and that behaviour is written into emissions regulation rather than chosen by the manufacturer.
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Airbag light on: causes, and why generic scanners often miss it
An illuminated SRS lamp means the airbags are disabled and will not deploy. The cause is usually a connector under a seat, and the code is usually invisible to a basic reader.
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DPF light on: the drive that clears it and the one that does not
The filter needs about twenty minutes of sustained motorway speed to burn off soot. Most people give it ten minutes of town driving and wonder why the light stays.
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Glow plug light flashing on a diesel: not about glow plugs
A steady coil symbol means preheating. A flashing one is the diesel equivalent of a check engine light, and glow plugs are rarely what it is complaining about.
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Oil light flickering at idle: pressure, sensor or wear
The red oil lamp is a pressure warning, not a level warning. A flicker at idle on a hot engine is the earliest signal of wear you will ever get — and the cheapest to act on.
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Power steering warning light: electric and hydraulic causes
Electric and hydraulic systems fail in completely different ways and give completely different warnings. Knowing which one you have decides whether this is a fluid check or a scan.
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TPMS light will not reset after inflating the tyres
You checked every pressure and the light is still on. Whether your car uses sensors in the wheels or infers pressure from wheel speed changes what the fix is entirely.
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Dashboard warning lights: what stops the journey and what waits for the workshop
The colour is the priority. Which lights mean stop now, which allow you to drive on carefully, and why a lamp that never illuminates is the worst of all.
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Peugeot 308 Dashboard Warning Lights: Complete Guide to All 16 Signals
Complete reference guide to the 16 dashboard warning lights on a Peugeot 308: colour coding, what each signal means, and the exact action you should take — from the red STOP light to the amber low-fuel indicator.