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Poor fuel economy + running rich = new lambda sensors??

1218 Views 7 Replies 4 Participants Last post by  andrewr, 
A
I've been told before that my car could be running a bit rich and recently I've noticed the fuel economy drop.

Is it likely the lambda/oxygen sensors needs replacing?
How many and where are they on the V6?
Where is best to get them from?
Are they easy to replace?

thanks
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M
Not sure if any help but my ST failed its last MOT on emissions, about 3 times above what they should be, MPG had been pretty steady though.

The garage did a diags on the engine and showed both lamda's had failed, these were replaced and it then sailed the emissions, mine lasted about 120k so if you car is on a similar mileage could be an issue.
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