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My mpg has took a nose dive from 30 average to 24, same driving etc. I'm doing an oil change to see if that helps but I'm concerned it's a faulty lambda sensor. Any way of diagnosing this without a diagnostic machine?

Was imformed.during mot that it had to be revved until red hot to pass emissions

I was thinking maybe doing a cruise control run on the motor way to see what mpg it returns after oil change, what should I expect? Car engine isn't modified only has hks and miltek without map.

Any help? Thanks!
 
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