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Engine guides and mods

451 Lambda Sensors

These sensors measure the air/fuel mixture ratio and adjust the engine parameters. If either of these are faulty you can have an engine light on, poor running or bad mpg.

Modification Details

The 451 has 2 lambda sensors.

The upstream sensor is located in the exhaust manifold over on the right.

The downstream lambda sensor is located in the middle of the exhaust can.

Follow the wiring to the connections and disconnect before undoing the sensors.

These can both be removed using a 22mm spanner and they spin out in an anticlockwise direction.
It is always a good idea to spray them with PlusGas before removal to free them a bit.
Also, a dab of copper grease can save them from seizing up next time.

On refitting, retighten the sensors to 40Nm if you have the correct tools.
If not, just make sure it is tight, you don't need to swing on the spanner though.

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