There are a few signs that your oxygen sensor may be failing. In general, it is difficult to diagnose problems with the sensor, unless all of the other components in the fuel injection system have been checked and determined to be operating correctly. Some of the symptoms of a failed oxygen sensor system are:

-Irregular idle during warm-up
-Irregular idle with warm engine
-Engine will not accelerate and backfires
-Poor engine performance
-Fuel consumption is high
-Driving performance is weak
-CO concentration at idle is too high or too low
-Check engine light is illuminated

In general, if the oxygen sensor is not working, the car will be running very poorly and will also be outputting a lot of harmful emissions. If the signal received by the computer is out of its normal range, the 911 Carrera’s computer will almost always give a warning signal that lights up the check engine lamp. Sometimes the computer may output an error code stating that the oxygen sensor is reading out of range, when in reality the values are out of range because there is something else wrong with the fuel injection system. Prior to replacing the oxygen sensors, make sure there are no other codes being recorded that may affect the O2 sensor readings.

If looking for O2 sensors for your 996, click HERE to view Bosch sensors.

If doing the install yourself, preview our step-by-step DIY article:
Replacing Your 911 Carrera Oxygen Sensors

Mark/Pelican Parts