The Fabia was built with very different engines, and their problem lists barely overlap. A breakdown by version, so you do not go hunting somebody else's faults on your own car.
Cooling systems are designed with margin, but that margin is eaten away over years: a clogged radiator, old coolant, a fan that engages late. What to check in May so you are not on the hard shoulder in July.
The most widespread advice before a test is to clear the codes. That is precisely the action that guarantees failure: the readiness monitors drop to not ready, and the inspector sees it immediately.
The RAV4 has a reputation for reliability and it is earned — but two topics repeat across generations. What diagnostics can see, and what still has to be checked on the dipstick.
The automatic is stuck in third, the manual will not select a gear, the dual-clutch judders. Diagnosis by transmission type, why fluid is usually to blame, and what to read before clearing anything.
The most common network code. Somebody on the bus stopped hearing the engine control module — and that almost never means the module itself has died. Causes from a voltage sag to a broken bus wire.
Cam timing codes almost never start with mechanics — they start with oil. A blocked control valve screen, pressure that will not hold, a cam that refuses to move on command. Why this is the cheapest repair among those that look expensive.
The TSI timing chain, TDI swirl flaps, the DSG mechatronic unit, and oil consumption — four topics that account for most Passat conversations of these generations. What diagnostics can see of each.
The code points at a sensor and the sensor is fine. The code vanishes and returns a week later. Why that happens, how to tell a real fault from a side effect, and why the freeze frame decides more than the code does.
Winter does not break cars — it exposes what was already broken. A weak battery, slow warm-up, and a small vacuum leak are invisible in summer and become a morning call-out in the cold.
The bodywork was welded and painted, but the electronics remember everything. How to use OBD-II to find a silent airbag module, a donor unit from another car, uncalibrated driver assistance, and the fingerprints of flood damage.
The seller clears the fault memory five minutes before you arrive, and your scanner reports a clean bill of health. Here is the seven-step order that catches it: readiness monitors, pending codes, freeze frame, a cold start, and the module roll call.