Which of the following circumstances may indicate bad technical condition of a passenger car?
Show the correct answer
Correct answer
A. Emission of black, blue or white thick fumes.
Explanation
Emission of thick black or blue exhaust fumes may indicate poor technical condition of the car - answer A. Colourless fumes (B) are normal, and a red oil pressure light before starting the engine (C) is a normal check of the warning lights.
Black smoke means that the fuel mixture is too rich or the injection is faulty, blue smoke - that oil is being burnt, for example because of worn piston rings or valve seals; thick white smoke after the engine has warmed up may indicate coolant getting into the cylinders. Such an engine loses power, pollutes the air and risks a serious failure. The Road Traffic Act requires that the vehicle does not emit harmful substances above the permitted standards and does not endanger safety; a smoking car will also not pass the technical inspection.
Legal basis: Art. 66 para. 1 point 1 and 3 of the Road Traffic Act (Prawo o ruchu drogowym)