Lambda Sensors / Probes

Lambda sensors (also widely known as Oxygen sensors) on your Porsche are fitted to measure the oxygen level in the emission gasses. They are designed to help your Porsche's engine to constantly monitor the efficiency of your cats and fuel to air ratio in the intake system to help the engine run smoothly. If one of those sensors was to fail on your Porsche it could trigger poor performance and abnormally higher emissions from your engine.

It is also advised to get new oxygen sensors if you are up for a change of the exhaust system on your car as often the thread shears off and refit of old sensors is not possible.