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Instructions for Removing the Lambda Sensor on Smart Fortwo 451

Model: Smart Smart 451 - Years 2007-2015
Part: Oxygen sensor

In this tutorial, you will see instructions that will allow you to remove the lambda sensor, or oxygen sensor, on a Smart Fortwo 451. The sensor is located on the catalyst of the exhaust, which is found at the rear; to access it comfortably, you will need to remove the rear bumper. Once removed, locate the lambda sensor and unscrew it using a spanner; after removing it, disconnect the sensor's electrical connector and replace it with the new one. Simply screw it in by hand first, then tighten with the spanner and reconnect the electrical connector!

Updated on 2 April 2026 by ScegliAuto

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