![]() ![]() ![]() Keep in mind, however, that these issues can also have other causes that have no relation to the health of a vehicle’s oxygen sensors. Other symptoms of a bad oxygen sensor include a rough idle, a misfire, and/ or hesitation when trying to accelerate. The downstream or diagnostic sensors only monitor the exhaust leaving the catalytic converter and will not cause such an issue. Such a swing in A/F ratio is a sign that an upstream or control sensor is faulty. This can happen because of a fuel mixture that is either too lean or too rich. In turn, the vehicle itself will often display physical symptoms due to a sensor that is not functioning properly.Ī decrease in fuel efficiency can be a telltale sign that an O2 sensor is not performing as it should. If a failing or dead sensor is the issue, there are several OBDII codes in particular that will be set off (more on this in the following section). This sensor is doing its job and does not need to be replaced. ![]() An oxygen sensor that reports a lean fuel mixture, for example, will certainly set off a code. It is first important to understand that an OBDII code in itself is not indicative of a failed oxygen sensor. ![]()
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