ABS light after a wheel change: what you disturbed
The lamp appeared right after the tyre fitter finished. That timing is not a coincidence, and the cause is usually something knocked rather than something failed.
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Audi Q3 and A5: shared VAG hardware, specific complaints
Two different body styles on the same group engines and gearboxes. Almost nothing on the fault list is exclusive to Audi, which makes documentation easy to find.
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Automatic headlights stopped working: sensor or setting
Before assuming a fault, check the switch position and what is stuck to the windscreen. Both explain more of these than any failed component.
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B0001 to B0100: airbag and restraint system codes explained
The one system where a warning lamp means a device may not deploy when you need it. Generic OBD-II usually cannot even see these codes.
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Bang on lift-off: exhaust backfire and what it means
A pop from the exhaust when you lift off is either an aftermarket calibration doing it deliberately or unburnt fuel reaching a hot catalyst. Those are very different.
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The battery monitoring sensor: the small box that decides your charging
Clamped to the negative terminal, it measures every amp in and out. Ignore it when replacing a battery and the new one lives a much shorter life.
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Belt squeal on a cold start: tensioner, pulley or contamination
A few seconds of squeal on a damp morning is a warning rather than an emergency — but the belt drives the water pump, and that changes the stakes.
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BMW B47 and B48: the modular generation and what it actually breaks
BMW rebuilt its engine range around a common 500cc cylinder module. The result addressed the previous generation problems and introduced a shorter list of its own.
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BMW F30 3 Series: OBD diagnostics and the known weak points
The F30 generation is well documented, which makes it easy to diagnose and easy to check before buying. Three items dominate the fault list.
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BMW N20 and N26: timing chain, oil filter housing and boost
A well-regarded engine with one documented failure that determines whether a used example is a bargain or a liability. The check takes thirty seconds.
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Boot or tailgate will not open: latch, switch or module
A tailgate that refuses to open has a small set of causes, and one of them is a wiring loom that flexes every time you use it.
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Brake pedal sinks to the floor: stop driving and read this
A pedal that keeps travelling under steady pressure means the hydraulic system is not holding. This is the one fault on the site that justifies a recovery truck.
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