How to Change a Lambda Sensor in an Alfa Romeo

Updated April 17, 2017

The lambda sensor, or what is commonly referred to as an oxygen sensor, measures the amount of air in the exhaust stream. It transmits this information to the engine control unit to analyse and modify how much fuel enters the engine. If the amount of air is minimal it restricts fuel flow; if air flow is high, the fuel injectors remain open for a longer period of time. The sensor is very sensitive to soot and heat; as a result, it can fail over the course of thousands of miles of use. If the oxygen sensor in your Alfa Romeo is bad, replace it immediately so that your engine runs smoothly and efficiently.

Open the bonnet and prop it up.

Unplug the oxygen sensor at the connector by pushing down on the tab and pulling outward.

Place a spark plug socket on your ratchet. Slip it over the oxygen sensor and loosen.

Remove the oxygen sensor and thread in the new one. Tighten it with a ratchet.

Reconnect the electrical connector by pushing it into the other electrical connector.


Before threading the oxygen sensor back into the exhaust manifold, place anti-seize onto the threads to facilitate removal of the oxygen sensor.


Wear safety glasses when working on your Alfa Romeo.

Things You'll Need

  • Ratchet
  • Spark plug socket
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About the Author

Shayrgo Barazi is a college graduate with a degree in automotive engineering technology (B.S.c.) from Ferris State University. He is a successful writer and has taken a college level technical writing course. He currently works for Time Wave Media writing automotive DIY articles. He has an intuition for technology and has the capacity to write, too.