三元催化器是一種用於控制有害氣體排放物的重要裝置，主要用在汽油發動機，三元催化器緊靠發動機安裝，一般安裝在汽車排氣管中，以便利用來自燃燒室的熱量來引發催化劑起作用，使二元催化劑的反應更為迅速。三元催化器根據催化器的類型不同，通常可以控制 2~3 種有害的排放物如果二元催化器出現故了汽車會有哪些表現呢?
三元催化器壞了故障表現一 發動機動力性能下降 燃油消耗增加
汽車在行駛過程中三元催化器很容易受到路面的作用，產生拖底或強烈振動，造成催化轉化器的碰撞致使二元催化轉化器載體破碎，容易阻塞排氣通道，造成動力性能下降、燃油消耗增加、排放惡化等
三元催化器壞了故障表現二 排氣通道阻力增大 排放惡化
由於供油系統、點火系統等的故障，發動機過熱、回火，造成催化轉化器載體燒結、剝落，排氣阻力增大，同樣也會產生排氣通道阻力增大，排放惡化不良影響。
三元催化器壞了故障表現三 發動機混合氣濃度混亂點火困難或燃燒不完全
三元催化器損壞的話第二級氧感測器將不能正確提供資料給行車電腦ECU，這樣發動機混合氣濃度就會出現過稀或者過濃,過稀會造成點火困難、行駛無力、發動機放炮等，過濃會增加油耗、燃燒不完全、汽缸、火花塞積碳嚴重等。出現此故障時發動機故障燈會點亮。
三元催化器壞了故障表現四
發動機過熱發動機沒勁有怪聲尾氣難聞
發動機回饋系統失靈，也可能導致發動機本身狀態不正常，以至於發動機過熱、早期磨損過度，發動機沒勁，有時候有怪聲，放炮之類的聲音，排氣怪味難聞等等
三元催化器故障總結
在不平的路面行駛時一定要注意:因為三元催化器裝在汽車底部，路況不好時很容易造成拖底，損壞一元催化器。
對發動機起動困難的故障一定要及時維修。因為發動機起動時，噴油器可能一直在噴油，但如果燃油沒有燃燒，就會積聚在三元催化器中。當發動機運行溫度上升時，這些燃油會使三元催化器溫度過高而損壞，造成三元催化轉化器載體燒結，從而引發三元催化器故障.
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A three-way catalytic converter is an important device used to control harmful emissions, mainly in petrol engines. The three-way catalytic converter is installed close to the engine, usually in the vehicle's exhaust pipe, so that the heat from the combustion chamber can be used to trigger the catalyst to work and make the binary catalyst react more quickly. Depending on the type of catalytic converter, the binary catalytic converter can usually control 2 to 3 harmful emissions.
Binary catalytic converter failure performance one Engine power performance decreased and fuel consumption increased
When the car is in motion, the catalytic converter is easily affected by the road, resulting in bottom dragging or strong vibrations, causing the catalytic converter to collide with the carriers, resulting in the exhaust channels being easily blocked, resulting in reduced power performance, increased fuel consumption and deteriorating emissions.
Binary catalytic converter failure performance two exhaust channel resistance increased emissions deterioration
Due to the failure of the fuel supply system and ignition system, the engine overheats and backfires, causing the catalytic converter carrier to sinter and peel off, increasing the exhaust resistance, which also results in increased exhaust resistance and worsening emissions.
The three-dimensional catalytic converter is bad performance three engine mixture concentration chaotic ignition difficulties or incomplete combustion
If the three-dimensional catalytic converter is damaged, the second oxygen sensor will not be able to correctly provide information to the car computer ECU, so the engine mixture concentration will appear too thin or too thick, too thin will cause ignition difficulties, driving powerless, engine gun, etc., too thick will increase fuel consumption, incomplete combustion, cylinder, spark plugs, such as serious carbon accumulation. The engine fault light will illuminate when this fault occurs.
Three yuan catalytic converter is bad fault performance four
Engine overheating engine engine no energy with strange sound exhaust gas smell
Engine feedback system failure, may also lead to the engine itself is not normal, so that the engine overheating, early wear and tear too much, the engine is not strong, sometimes there is a strange sound, the sound of the gun, exhaust gas smell bad, etc.
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