Check Engine

Check Engine lights on me, and consumes a lot of gasoline, the code it gives is P 0420 already changed the two oxygen sensors of the entrance and exit of the catalyst and it remains the same, someone could help me.

Friend, it may be that your catalyst is failing.
When reading the 1 sensor is similar to that of the 2 sensor the Catalitian fails, which lights the light of the check.
Luck

Hello friend, as Roberto@5 says, everything indicates that the catalyst is damaged, which will not remedy change oxygen sensors. Now, I suggest that you clean the injectors in a site that they do it conscientiously, because in our daily work we generally find that vehicles with excessive fuel consumption during the leakage test of the injectors, in which it should not miss a single drop for 60 seconds under working pressure, they are jets and it is not uncommon that instead of counting in drops, the count has to be done in cubic centimeters. We found it all the time. Obviously all excess fuel is not burned during the combustion of the cylinders and some part goes to the oil, and another part (surely the largest) comes out of the escape, which inevitably damages the catalyst, (and your pocket too).
Then summarize to ensure that they make a good intonation we recommend:
1. Make service to the fuel system of your vehicle (injector cleaning, acceleration body cleaning, gasoline filter replacement, correct pressure verification of the gasoline pump, correct work verification of the fuel pressure regulator).
2. Compression take to the cylinders.
3. Verification of spark plugs and calibration.

Eye: Take the injectors to a site where they do drip, flow, flow and uniformity before and after having cleaned them with ultrasound so that you can see the difference. What matters least is that they are clean on the outside and the re-establishment of normal injector work patterns can and should be recorded numerically.
I have annexed a type diagnosis that we make as a standard in our workshop and a couple of videos to be easier to understand what I tell you.
Regarding the catalyst, if as Roberto@5 says, the two oxygen sensors read the same, it only remains to be replaced. But first correct the injection problem because if the new catalyst would be damaged.

Hello friend, as Roberto@5 says, everything indicates that the catalyst is damaged, which will not remedy change oxygen sensors. Now, I suggest that you clean the injectors in a site that they do it conscientiously, because in our daily work we generally find that vehicles with excessive fuel consumption during the leakage test of the injectors, in which it should not miss a single drop for 60 seconds under working pressure, they are jets and it is not uncommon that instead of counting in drops, the count has to be done in cubic centimeters. We found it all the time. Obviously all excess fuel is not burned during the combustion of the cylinders and some part goes to the oil, and another part (surely the largest) comes out of the escape, which inevitably damages the catalyst, (and your pocket too).
Then summarize to ensure that they make a good intonation we recommend:
1. Make service to the fuel system of your vehicle (injector cleaning, acceleration body cleaning, gasoline filter replacement, correct pressure verification of the gasoline pump, correct work verification of the fuel pressure regulator).
2. Compression take to the cylinders.
3. Verification of spark plugs and calibration.

Eye: Take the injectors to a site where they do drip, flow, flow and uniformity before and after having cleaned them with ultrasound so that you can see the difference. What matters least is that they are clean on the outside and the re-establishment of normal injector work patterns can and should be recorded numerically.
I have annexed a type diagnosis that we make as a standard in our workshop and a couple of videos to be easier to understand what I tell you.
Regarding the catalyst, if as Roberto@5 says, the two oxygen sensors read the same, it only remains to be replaced. But first correct the injection problem because if the new catalyst would be damaged.

Hello friend, as Roberto@5 says, everything indicates that the catalyst is damaged, which will not remedy change oxygen sensors. Now, I suggest that you clean the injectors in a site that they do it conscientiously, because in our daily work we generally find that vehicles with excessive fuel consumption during the leakage test of the injectors, in which it should not miss a single drop for 60 seconds under working pressure, they are jets and it is not uncommon that instead of counting in drops, the count has to be done in cubic centimeters. We found it all the time. Obviously all excess fuel is not burned during the combustion of the cylinders and some part goes to the oil, and another part (surely the largest) comes out of the escape, which inevitably damages the catalyst, (and your pocket too).
Then summarize to ensure that they make a good intonation we recommend:
1. Make service to the fuel system of your vehicle (injector cleaning, acceleration body cleaning, gasoline filter replacement, correct pressure verification of the gasoline pump, correct work verification of the fuel pressure regulator).
2. Compression take to the cylinders.
3. Verification of spark plugs and calibration.

Eye: Take the injectors to a site where they do drip, flow, flow and uniformity before and after having cleaned them with ultrasound so that you can see the difference. What matters least is that they are clean on the outside and the re-establishment of normal injector work patterns can and should be recorded numerically.
I have annexed a type diagnosis that we make as a standard in our workshop and a couple of videos to be easier to understand what I tell you.
Regarding the catalyst, if as Roberto@5 says, the two oxygen sensors read the same, it only remains to be replaced. But first correct the injection problem because if the new catalyst would be damaged.