Hyundai Ioniq 5 and Kia EV6: E-GMP diagnostics for owners
A dedicated 800 V electric platform. Almost nothing OBD-II was designed to read exists here, so knowing what does matter is the whole skill.
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Blog
IUMPR: the ratio that proves your monitors actually run
A monitor that says "ready" once is not the same as a monitor that runs regularly. IUMPR is how the regulator closed that gap, and it is readable.
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Iveco Daily: van diagnostics where the load never stops
A ladder-chassis van built for real payloads, which means its faults come from work rather than from age. Two readings predict most of them.
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K-line and ISO 9141: diagnosing cars built before CAN
Vehicles from roughly 1996 to 2007 often use a single-wire protocol that many cheap adapters handle badly. Knowing which one you have avoids blaming the car.
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Key fob range suddenly short: battery, aerial or interference
Having to stand next to the car to unlock it is a symptom with a short list of causes, and one of them costs less than a coffee.
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Kia Picanto and Stonic: small Kias and the checks that pay
Two of the more dependable small cars available, where the useful diagnostic work is mostly confirmation rather than investigation.
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Lexus RX and NX: premium Toyota hardware and the extra modules
Toyota mechanicals with a premium electronics layer. The engine documentation transfers directly; the module density is what differs.
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Long crank on the first start: pressure that leaked away overnight
Three seconds of cranking on the first start and instant restarts all day. That pattern points at fuel pressure, and there is a two-minute test for it.
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Mazda 3 and CX-30: SkyActiv-X, mild hybrid and knock behaviour
Mazda went the opposite way from everyone else on engine design. That produces a genuinely different fault profile, and one reading matters more than usual.
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Mercedes OM651: injectors, timing chain and the delete myth
The four-cylinder diesel in half the Mercedes range for a decade. Two documented issues dominate, and one of them is measurable before it becomes a symptom.
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Mercedes W204 and W205 C-Class: the fault list by generation
Two generations of the same car with different engines, different electronics and different weak points. Knowing which you are looking at matters.
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MG ZS and HS: what OBD reads on the reborn badge
A British badge on SAIC engineering. Generic OBD-II reads them normally, which matters because independent workshop familiarity is still building.
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