N visible symptoms, L flat-looking tires or uneven tire wear, N audible symptoms – TOYOTA 2011 Yaris Sedan User Manual
Page 307: L changes in exhaust sound, L excessive tire squeal when cornering, L strange noises related to the suspension system, L pinging or other noises related to the engine, N operational symptoms, L engine missing, stumbling or running rough, L appreciable loss of power

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