Symptoms of a Bad Nissan Titan Oxygen Sensor
The Nissan Titan oxygen sensor primarily measures the air/fuel ratio in your combustion system. Your truck has two sensors, and the first one is found in front of the catalytic converter and serves the main function. After it measures the air/fuel ratio, it sends a signal to the computer, which uses this information to try and get the needed mixture. The other oxygen sensor, meanwhile, is found behind the catalytic converter. Aside from measuring the air/fuel ratio, it also checks if the catalytic converter is working. If either of these oxygen sensors turn faulty, then your truck's engine will start to go bad. So if you experience any of the following symptoms, then it's time to take a look at the oxygen sensor.
Rough engine idle
If your truck has a bad oxygen sensor, its engine will often run irregularly. This component contributes to the engine's different functions, including fuel mixture, timing, and combustion intervals. If the oxygen sensor turns faulty, then these functions can get disrupted and cause a rough engine idle. If you are experiencing this, run some function tests to diagnose the component.
If a bad oxygen sensor causes an engine's air/fuel ratio to become too lean or restricted, then the explosions within the combustion system will be altered. Normally, a mixture that has too much air and not enough fuel will cause the engine to misfire. This condition is normally experienced during idle or at lower speeds.
On the other hand, if the air/fuel ratio is too rich in all of the engine's cylinders, then the oxygen sensor might already be dead. If this component has stopped working entirely, this could prevent the computer from going into closed loop and allow the ratio to lose its balance.
If a bad oxygen sensor is aligned with the ignition system, it can either slow down or speed up the ignition timing, which can cause the engine to ping. This sound occurs when the engine's combustion gases are ignited at the wrong times.
Poor gas mileage
Depending on which oxygen sensor is faulty, the fuel delivery and the fuel combustion systems can be thrown off or made irregular by a bad sensor. If too much fuel is injected into the combustion system or the faulty part disturbs the delicate air/fuel mixture of your truck's engine, then gas mileage will suffer.