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Not every buyer comes in with a make and model in mind — sometimes you've just heard a noise, seen a warning light, or felt a shudder. These pages work backwards from the symptom to every engine and transmission we've found it on, across every brand.

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VARIES BY ENGINE — SOME MINOR, SOME SERIOUS Rattling Noise on Cold Start 9 known causes across brands MODERATE TO SERIOUS — GET IT CHECKED PROMPTLY CVT Shudder or Hesitation 5 known causes across brands VARIES — MOSTLY MANAGEABLE, SOME SEVERE Oil Consumption / Blue Exhaust Smoke 7 known causes across brands SERIOUS IF IGNORED — CAN LEAD TO OVERHEATING External Coolant Leak From the Head Gasket 3 known causes across brands MODERATE — USUALLY DRIVING-PATTERN RELATED DPF / EGR Warning Light (Diesel) 9 known causes across brands CRITICAL — DO NOT DRIVE THE CAR FURTHER Engine Seizure or Rod Knock 3 known causes across brands MODERATE TO SERIOUS, DEPENDING ON THE TRANSMISSION Dual-Clutch Transmission Hesitation or Jerky Shifting 3 known causes across brands MODERATE — COSTLY BUT RARELY DANGEROUS Air Suspension Sagging or Warning Light 5 known causes across brands