The increasing fuel consumption of cars may or may not be caused by the problem of the oxygen sensor; in fact, there are too many conditions that cause the fuel consumption of the engine to increase with use, and the problem of the oxygen sensor is only one of them;
In fact, cars, like many other industrial products and electrical appliances, will continue to increase their power consumption with continuous use. This is an inevitable and almost irreversible phenomenon!
Therefore, the increase in fuel consumption is a normal phenomenon with the continuous increase of the service cycle and mileage of the car;
And there is no need to actually replace a certain part or reason. To be honest, even if the oxygen sensor is not broken, the fuel consumption of the car will still show an increasing trend;
Sometimes this is the case, car owners feel that fuel consumption is getting higher and higher, and when they go to the repair shop, they are advised to change the oxygen sensor, clean the carbon deposits, etc., but the repairs are completed, and the fuel consumption still cannot come down. This is a common phenomenon!
With the use of the engine, the power drops
This is an actual state, that is to say, as the engine is used day after day, the power is showing a downward trend. Even if carbon deposits and oxygen sensors are eliminated, the power of the engine is still declining. This is actually related to the engine. Aging is related;
With the continuous use of the machine, the gap between the various parts will continue to increase, resulting in excess vibration, increasing noise, and secondly, the air tightness decreases, resulting in a decrease in power;
In this regard, the all-aluminum engine is the most obvious, because the expansion coefficient of aluminum alloy is larger and the margin between parts is larger!
With the continuous decline of engine power, it is actually a process of increasing power consumption, which is close to the use of many electrical appliances;
For example, TVs, refrigerators, etc., are used more and more electricity. With the decline in cooling efficiency of refrigerators （without considering the lack of freon）， in order to achieve the previous cooling effect, the compressor must be started more frequently, and the compressor must be started. More frequent, naturally more power!
The same is true for car engines. As the power used continues to decline, more fuel must be sprayed to obtain the previous power, so the car always becomes more and more fuel-intensive as it is used!
The increasing fuel consumption of cars is a comprehensive problem
After writing this, friends should understand that the higher and higher fuel consumption of cars as they are used is a comprehensive problem, mainly due to the performance degradation of the engine itself;
Secondly, it may be caused by increased carbon deposits, severe ablation of spark plugs, low tire pressure, constant full load, blockage of the carbon canister, and damage to the oxygen sensor;
Therefore, the increase in fuel consumption of old cars does not necessarily have to be a problem with the oxygen sensor. In other words, a problem with the oxygen sensor will definitely lead to abnormal fuel consumption, but the increase in fuel consumption is not necessarily due to a problem with the oxygen sensor. The problem of increased fuel consumption!
Actual performance of oxygen sensor damage
The oxygen sensor is actually a tool for checking the oxygen content of automobile exhaust. It is divided into an upstream sensor and a downstream sensor. The two sensors are installed at both ends of the three-way catalytic converter （as shown in the figure above）。 The upstream sensor monitors the exhaust gas. Oxygen content, the signal sent to ECU to adjust the air-fuel ratio;
The downstream sensor is responsible for monitoring the working status of the three-way catalyst, and adjust the air-fuel ratio according to the working status of the three-way catalyst. Simply put, when the downstream sensor finds that the exhaust gas passing through the three-way has a high oxygen content, it will control the air-fuel ratio. Make adjustments, because the high oxygen concentration affects the conversion efficiency of the ternary!
The principle of the upstream sensor is also very simple. When the exhaust gas oxygen content is found to be low, the judgment result is that the mixture is too rich （air-fuel ratio is lower than 14.7）， and the ECU will be issued a command to reduce the fuel injection volume, thereby re-raising the air-fuel ratio. ; When the exhaust gas oxygen content is found to be high, the judgment result is that the mixture is leaner. At this time, the ECU will issue an instruction to increase the fuel injection volume, and then reduce the air-fuel ratio to around 14.7 （14.7 is the ideal air-fuel ratio, but not the maximum air-fuel ratio. Fuel ratio）;
Therefore, the damage of the oxygen sensor is not only manifested as the increase in fuel consumption, but will produce a series of problems such as black smoke from exhaust, unstable idle speed, weak acceleration, and substandard exhaust gas. Therefore, only the increase in fuel consumption cannot prove the oxygen sensor. damaged!
In fact, the oxygen sensor is really not that easy to break. Generally speaking, as long as the internal ceramic components of the original oxygen sensor are not broken and the resistance element has no leakage problems, then the oxygen sensor actually only needs to be cleaned, and there is no need to replace it. （It’s the best solution if it’s not bad for money）。
The cleaning method is not complicated, and 12% ferric chloride can be combined with hydrochloric acid （hydrochloric acid can be replaced by Jie Toilet Ling）。 Generally, the oxygen sensor after cleaning can be restored to good use status;
All in all, the increase in fuel consumption of old cars is not necessarily due to a problem with the oxygen sensor. On the contrary, a problem with the oxygen sensor produces a series of consequences, not just a fuel consumption increase!
Recommended reading:crankshaft sensor crankshaft position sensor coolant temperature sensor