Does a Faulty Three-Way Catalytic Converter Increase Fuel Consumption?

[AsherMarie]

Yes, a damaged three-way catalytic converter increases fuel consumption. Here is some information about the three-way catalytic converter: 1. The three-way catalytic converter primarily affects vehicle emissions. Lower emissions indicate more complete fuel combustion and better fuel efficiency. When the catalytic converter is damaged, gasoline cannot burn and be utilized efficiently, naturally leading to higher fuel consumption. 2. The function of the three-way catalytic converter is to convert harmful gases from vehicle exhaust into harmless gases. The main harmful gases in vehicle exhaust include carbon monoxide (CO), nitrogen oxides (NO), and hydrocarbons (HC). The three-way catalytic converter uses certain chemical agents to undergo a series of chemical reactions with the harmful gases in the exhaust, converting them into harmless gases.

[VonEthan]

My car's catalytic converter was previously broken, and indeed the fuel consumption increased significantly. Originally, it consumed about 8 liters per 100 kilometers in city driving, but it soared to 11 liters, and I felt like the fuel gauge was dropping rapidly. After the catalytic converter got clogged, the exhaust flow was obstructed, and the engine had to work harder to maintain operation, which was like dragging a big rock—very strenuous. I consulted with the mechanics, and they said that a faulty catalytic converter not only increases fuel consumption but also affects acceleration performance and can even cause the vehicle to fail emissions tests during annual inspections. They suggested that if abnormal fuel consumption is noticed, the catalytic converter and related sensors should be checked first. After replacing the faulty parts, everything returned to normal, saving a lot on fuel costs. Regular maintenance is also important—avoid using low-quality fuel to prevent faster carbon buildup and clogging.

[McLondyn]

When the three-way catalytic converter malfunctions, fuel consumption often increases. This is what I've observed from my car repair experience. A clogged catalytic converter restricts exhaust flow, increasing engine load, which requires burning more fuel to compensate. I've personally encountered several vehicles with this issue, one of which saw its fuel consumption rise from 10 liters to 15 liters per 100 km—quite noticeable. Additionally, a failed catalytic converter can lead to foul-smelling exhaust, increasing environmental pollution. Repairing it not only reduces fuel consumption but also protects the air. I recommend regularly using an OBD scanner to check for trouble codes; early detection can prevent additional expenses.

[VanJude]

A faulty catalytic converter definitely increases fuel consumption because it's responsible for purifying exhaust gases. Once clogged, it obstructs the engine's exhaust system. I noticed abnormal fluctuations in fuel consumption while driving, such as worsened efficiency in eco mode where fuel was being used up unusually fast. A damaged converter may also affect other components, like causing oxygen sensor malfunctions, indirectly worsening fuel economy. Regarding maintenance, keeping the engine running smoothly is crucial, and timely repairs can save both fuel and money.

[VonDaniel]

I think a faulty catalytic converter definitely makes the car consume more fuel. My friend's car had the same issue – the fuel consumption suddenly skyrocketed, and after inspection, it turned out the catalytic converter was clogged. When the engine's exhaust is blocked, it has to inject more fuel to maintain power, which is similar to stepping hard on the gas in traffic jams. Related effects also include slower acceleration and reduced power, but after the repair, the fuel consumption stabilized. I suggest not delaying the fix to avoid major repairs, and it's also a good idea to check the air filter and spark plugs to ensure overall efficiency.