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[Mark Appleton]

I replaced the filter and elbow and the car no longer smells of fuel after a journey, but the trims have skewed toward positive. I’m told that this is to be expected while the ECU adjusts to the new setup.

I found a full set of pre and post-cat sensors for £35, so I might just change them all – the car has done 82,000 miles, and while 100,000 is the common interval, I’ve already got the tool.

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