Problem with oxygen sensor or other sensor ..?

Greetings I recommend that you review the gasoline pressure regulator this is in the injector rail generally gives that minimal failure since it does not maintain the right pressure and makes that 1 or more injectors Goteen. The oxygen sensor goes to the exhaust seeks from the exhaust to the exhaust tube seeks before and after the ranking if I do not remember that car model they take it to the naked eye at the exhaust downer I do not remember if your year of vehicle carries it to 2001 if I do not review one recently

The vehicles of the nineties onwards have sensors in the air filter or serca of the llamos flowers when this sensor fails a lot of problem with the Mescla and produce a lot of black smoke, I wait for you, serve you.

Hamigo generally the vehicles of the nineties onwards have sensors in the air filter or the serca of the call them flowers when this sensor fails gives a lot of problem with the Mescla and produce a lot of black smoke I hope it serves you.

Excuse me, I meant under the exhaust multiple cover but serca from the engine