Here are the potential reasons behind it: 1. Lambda sensor. The lambda sensor (oxygen sensor) often dies from leaded gasoline, covered with lead oxides. Because of this, the ECU begins to pour more gas than necessary, the mixture is re-enriched, the CO content in the exhaust increases (which is one of the indirect signs of a malfunction of the lambda probe). A malfunction of the lambda probe can also be detected using computer engine diagnostics. The lambda probe must either be replaced, which is expensive – a new one costs about $ 400 in most modern cars. 2. Spark plugs Replacing spark plugs- one of the options to combat increased fuel consumption. Over time they can start to deteriorate. To choose the correct spark plugs you should check the manual of your vehicle. Secondly, it is better to purchase reputable brands from a good store. Otherwise, replacing them might not give any effect. There are fakes being sold. 3. Filters fuel air oil. They should be looked at for clogging and, if necessary, replaced. Very often this is what helps to decrease the fuel consumption. 4. Compression Measure compression in order to check the condition of the engine. Of course, not only the flow rate depends on the condition of engines, as well as on the condition of other units of your car. In any case, it is possible and necessary to carry out diagnostics – both by yourself and trust the specialists. It is possible and necessary to deal with breakdowns and malfunctions in a car (if there is a budget, time and desire); but there are other factors that are not a reason to visit the diagnostic centre, but affect (sometimes very significantly, sometimes not very) the expense. 5. Engine size and car class Of course, it is foolish to expect a small fuel consumption from a large SUV or, for example, from a large executive class sedan. In this case, increased consumption can be considered a kind of payment for comfort. But there is a small paradox: on machines of the same class with the same driving style, the consumption for engines with a smaller engine capacity is greater. At the same speed, the engine with a larger volume will work with less load and, accordingly, consume less fuel. 6. Driving style For those who like to get off the traffic light, “drown” the gas pedal, often uses kick-down, fuel, of course, is consumed faster. Therefore, if you are worried about the expense, think about how you drive. Especially in the city. 7. Mileage With age, the condition of the car, of course, worsens. And with the deterioration of the state of the units, an increase in consumption is logical. Thus, you can see that the fuel consumption on your car depends on a large number of factors – perhaps not on the location of the stars in the sky. The main question is how to deal with increased fuel consumption and whether to fight at all? Very often, any repair, designed to reduce consumption, will cost you in such an amount that can pay for a long-term drive by car with thereby increased consumption. In addition, there is not always a guarantee that repairs will bring the desired effect. It is worth considering whether your expense is really as large as it seems to you and whether it is worth fighting it. Most of the times consumers complain about fuel prices but following these steps would help decrease fuel usage. If you have an old car that consumes too much fuel, you may consider selling it to a Sydney Car Buyer. You can always contact Sydney Car Buyer to sell your car for cash and also get a free car removal.