Real cases · Anonymised
Case studies
Every case is a verified repair — stripped of customer-identifying information and turned into structured training. Students diagnose interactively: evidence is revealed stage by stage, and reasoning is compared to MechanIQ's.
Customer-identifying information is hidden. VINs, plates and customer names are removed before publishing.
BMW · 2014EXPERT
N20 Cold-Start Rattle
320i (anonymised) · Engine / Timing
Cold-start timing-chain rattle for 2–3 seconds, then silent. Intermittent MIL for timing deviation.
Diagnose interactively
Audi · 2013ADVANCED
2.0 TFSI Oil Consumption
A4 (anonymised) · Engine / Piston rings
1 L oil per 800 km, no external leaks, occasional misfire on cyl 2.
Diagnose interactively
Toyota · 2019EXPERT
Corolla HV Inverter Insulation Fault
Corolla Hybrid (anonymised) · Hybrid / HV
HV system MIL, 'Check Hybrid System', no ready mode after rain.
Diagnose interactively
Audi · 2017INTERMEDIATE
A4 Parasitic Draw — Sleep Event
A4 (anonymised) · Electrical
Battery flat after 2 days standing; replaced battery twice.
Diagnose interactively
Ford · 2016ADVANCED
EcoBoost Low-Pressure Fuel
Focus (anonymised) · Fuel
Long crank when hot, P0087, slight stumble under load.
Diagnose interactively
Land Rover · 2021INTERMEDIATE
Defender EAS Valve Block
Defender (anonymised) · Suspension / EAS
Rear sags overnight, occasional 'Suspension will lower when parked' message.
Diagnose interactively