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On certain vehicles, there is not sufficient space between the plunger and the barrel of the fuel injector, due to improper assembling process of the injector, and the O-ring is deformed and/or damaged, losing sealing efficiency, in which case fuel can mix into engine oil. If this problem is left unattended, the oil amount in the oil pan may increase, and consequently, fuel mixed engine oil may enter into the inlet pipe through the blow by hose, in which case the engine revolutions could increase.

The surfaces that the nuts securing the rear axle stabilizer shackle face are not plane, and therefore the nut may become loose causing abnormal noise.

On certain vehicles, the valve spring seat on the vacuum brake booster pump is not properly installed. If left unfixed, backflow of air at the time of engine stop may move the valve spring seat, and in the worst case, the valve could malfunction resulting in reduced braking efficiency.

On certain vehicles, the frame bracket securing the steering rack is not at the correct position, and therefore the joint between the steering rack and the intermediate gear is not at the correct position. If left unfixed, the joint may become loose, and in the worst case the serrated sections may wear, making steering impossible.