Written by 9:47 am Sports

Why Does My Car Rpm Go Up And Down When In Park?

The reason why your car is doing this is because you have a sensor that is not sensing correctly. If the O2 sensor goes bad, it will make your car run rich (too much fuel) and if it goes bad in the other direction, it will make your car run lean (not enough fuel). The O2 sensor is monitoring the amount of oxygen that is present in the exhaust gases as they exit your engine. This allows the computer to adjust how much fuel should be injected into each cylinder based on how hard you are pushing the pedal.

The easiest way to tell if this is happening to you is to get an O1/O2 tester at any auto parts store and plug it into one of your O2 sensors. If your car fails the test, then you most likely have a bad O2 sensor which can be replaced for about $20-$30, depending on what type of vehicle you have.

There are two types of tests that can be performed with an O1/O2 tester: 1) A live test and 2) A plug-in test. The live test involves hooking up a probe from the tester directly to one of your sensors while driving down the road at various speeds (or idling). The plug.

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Last modified: September 11, 2022

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