SAE J1979-2 (OBDonUDS): why your scanner suddenly reads less
A newer car that returns fewer parameters than an older one is not faulty and your adapter is not broken. The legislated data moved to a different protocol.
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Blog
SEAT Ibiza and Arona: the small VAG platform in detail
Mechanically a Polo and a T-Cross with different bodywork. That is genuinely useful — every fault is already documented somewhere else in the group.
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Security gateway modules: why your adapter can read but not command
A module between the diagnostic connector and the vehicle network decides what a tool is allowed to do. Reading is usually permitted. Acting often is not.
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Skoda Scala and Yeti: two eras of the same engineering
The Yeti belongs to an earlier VAG generation and the Scala to the current one. Same group hardware, different specific concerns.
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Smart alternators: why your voltage swings and that is correct
Charging voltage that drops to 12.5 V under acceleration and jumps to 15 V on the overrun looks like a fault. On a modern car it is the design working.
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Speedometer stopped: sensor, cluster or bus
A dead speedometer takes cruise control, the gearbox and sometimes ABS with it. What else stopped working tells you where the fault is.
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Push-button start does nothing: brake switch, fob or module
Nothing at all when you press the button is a different fault from cranking and not starting. The list of causes is short and mostly cheap.
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"Steering assist reduced": voltage before you condemn the rack
Electric power steering draws heavy current. That is why a message about the steering is so often a message about the battery.
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Steering wheel off centre after alignment: what went wrong
A wheel that sits crooked while the car tracks straight is not cosmetic. It means the alignment was done incorrectly, and it affects the safety systems.
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STN chipsets versus ELM327 clones: what actually differs
Two adapters that look identical and cost ten times apart. The difference is real, and it shows up precisely when you need the tool to work.
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Surging at a constant speed: fuel trim, torque converter or EGR
A gentle rhythmic pulsing at a steady cruise, with your foot still. The frequency of the pulse points at which system is hunting.
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Suzuki Jimny and SX4: simple hardware, specific checks
Mechanically straightforward vehicles where most of the maintenance value is in drivetrain oils that nobody changes.
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