Failed MOT on lambda, ideas needed please!

Soldato
Joined
25 Oct 2002
Posts
4,198
Location
Derbyshire
GF's 1.4 k reg just failed on lambda of 16.something.

It had a new exaust sensor about 6 weeks ago due to problems running and engine light comming on and black plugs. I did the paperclip and it said :-

44Oxygen sensorAir/Fuel mixture too lean (weak)


I changed the lambda sensor and power came back and plugs cleared up

Today it failed the MOT on high lambda readings so what could it be? Did i need to reset the ECU after the last fault? if so how?
 
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