Ford Transit: OBD diagnostics for a working van
A van that stops working costs money by the hour, which changes the diagnostic priority from curiosity to prediction. Three readings forecast most Transit downtime.
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Blog
Freeze frame or live data: which one answers your question
One is a photograph of the moment a fault occurred, the other is a film of what is happening now. Choosing the wrong one is why people stare at healthy numbers for an hour.
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Fuel gauge reading wrong: sender, float or instrument cluster
A gauge that sticks, jumps or reads empty with a full tank is nearly always the sender inside the tank. How it misbehaves tells you which part of the sender failed.
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Automatic gearbox slipping: what to check before a rebuild quote
Revs rise, speed does not. Before accepting a four-figure quote, three checks separate a fluid problem from a worn clutch pack — and they are all cheap.
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Genesis, Infiniti and Acura: OBD on the premium Asian brands
Three premium badges built on Hyundai, Nissan and Honda foundations. The mainstream mechanical documentation applies directly — the premium layer is what needs different tools.
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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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Grinding when braking: how far past the pads you already are
A squeal is a warning. A grind is the sound of metal on metal, which means the warning stage is over and the bill has already grown.
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Haval and Great Wall: OBD diagnostics on Chinese SUVs
These read fine on generic OBD-II, and that matters more than usual: independent workshop familiarity is thin, so owner-side data does more work here than on established brands.
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Headlights dim at idle: charging system or ground fault
Lights that brighten when you rev are telling you the alternator cannot meet demand at low speed. Whether that is the alternator, the belt or a bad ground is decided by one measurement.
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Honda Civic and Accord: common OBD faults by generation
Honda engines are famously durable, so the recurring faults cluster around the systems bolted to them — VTEC oil pressure, catalyst efficiency and, on turbo models, oil dilution.
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Hyundai Tucson and Santa Fe: OBD diagnostics on the SUV range
Hyundai SUVs share engines and modules with Kia, so the fault list transfers directly. The GDI engines have a documented history worth understanding before buying.
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ISO-TP (ISO 15765-2): how long diagnostic messages travel on CAN
A CAN frame carries eight bytes. A VIN is seventeen. ISO-TP is the layer that solves that, and understanding it explains several otherwise baffling adapter behaviours.
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