I have a Bugeye WRX which had been idling at around 400-500 rpm instead of about 650-750 as it used to. There is a slight hesitation at low revs which i understand could be the lambda sensor, but i was wondering if this dodgy lambda sensor could be causing the idle to drop so low?!! Anyone got any ideas

 

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This may be useful to see if there are any fault codes

 

I have had the car hooked up to the main dealers comp and no fault codes are showing, I just wondered if a dodgy lambda may cause the car to idle low when hot? But cheers for the link, plenty to read on there