Mod Details
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Euro 4 Lambda Exhaust
Remove the rear panels and the crash bar. Spray both lambda sensors with PlusGas before attempting to remove with a 22mm spanner. The upstream sensor in in the upper elbow.
![](/wp-content/uploads/smartengine/exhaust/451/lambda/lambda1.jpg)
The 2nd is in the silencer. This uses the same 22mm spanner.
![](/wp-content/uploads/smartengine/exhaust/451/lambda/lambda2.jpg)
Disconnect the wiring to the upstream lambda sensor, this is easiest to access by opening the engine flap in the boot. The connection has a clip that is pushed in, the plug then pulls out.
![](/wp-content/uploads/smartengine/exhaust/451/fitting/exhaust2.jpg)
Do the same on the downstream lambda sensor.
![](/wp-content/uploads/smartengine/exhaust/451/fitting/exhaust3.jpg)
Undo the sensors. Anticlockwise (counterclockwise) to remove them. Replacement codes can be found here.
Euro 5 Exhaust Lambda Sensors
Remove the rear panels and the crash bar. Spray both lambda sensors with PlusGas before attempting to remove with a 22mm spanner. The upstream sensor in in the upper elbow. The 2nd is in the silencer. This uses the same 22mm spanner.
![](/wp-content/uploads/smartengine/exhaust/451/euro5/eurofive7.jpg)
Disconnect the wiring to the upstream lambda sensor, this is easiest to access by opening the engine flap in the boot. The connection has a clip that is pushed in, the plug then pulls out.
![](/wp-content/uploads/smartengine/exhaust/451/fitting/exhaust2.jpg)
Do the same on the downstream lambda sensor.
![](/wp-content/uploads/smartengine/exhaust/451/fitting/exhaust3.jpg)
Undo the sensors. Anticlockwise (counterclockwise) to remove them. Replacement codes can be found here.