Motor Vehicle Mechanics case studies
Motor Vehicle Mechanics · Put your knowledge to work in context.
This page is an independent study resource for candidates preparing for the City & Guilds Motor Vehicle Mechanics qualification, commonly referenced by the code 3902. It is aimed at learners and apprentices working on vehicle maintenance and repair skills, and at technicians consolidating knowledge for assessment. The Motor Vehicle Mechanics case studies are 5 cases and about 2,972 words.
1Flashing P0301 After Parts Swaps: Compression or Ignition?
2016 compact sedan, 1.4 L turbocharged petrol, 96,000 km, arrives with a flashing MIL and P0301 (cylinder 1 misfire) under acceleration. Spark plugs were replaced 10,000 km ago; the coil and injector from cylinder 1 have already been swapped to cylinder 4 by another shop, and the misfire stayed on cylinder 1.
625 words, about 3 min2Brake Judder 8,000 km After Rotor Replacement
2018 mid-size SUV, 62,000 km, complains of steering-wheel shake when braking from 90 km/h, worst between 80 and 60 km/h, pedal feels normal. Front rotors and pads were replaced 8,000 km ago at another shop.
562 words, about 3 min3Intermittent Battery Drain on a Pickup With an Aftermarket Camera
2019 pickup, 3.5 L V6, 74,000 km, battery goes flat after 2–3 days parked. Battery is 8 months old and passes a conductance test at 78% state of health; charging system holds 14.1 V at idle with loads on.
619 words, about 3 min4Highway-Only Overheating With a Large Radiator Temperature Drop
2013 2.0 L four-cylinder diesel, 185,000 km, overheats only at steady 100–110 km/h; around town the gauge stays at 90 °C. Coolant is full, no external leaks, and the thermostat and housing were replaced two weeks ago.
594 words, about 3 min5Repeated DPF Regeneration on a Short-Trip Diesel Van
2018 2.0 L diesel van, 80,000 km, used for 5–8 km stop-start deliveries five days a week. DPF warning lamp is on; the dealer has performed two forced regenerations in 3,000 km.
572 words, about 3 min