Rough running

[Vintagesteak88]

Hi everyone

I’m new here and have been having some issues with my car recently. It is a Seat Leon SC Fr 1.4ecotsi 150ps. The other day the car threw up a fault for stop/start system, drove fine after stop/start was deactivated via the button, yesterday it started running rough on idle, drove home from work approx 15miles and the idle issue was worse to the point car almost cut out. I have Carista so plugged in and got a number of codes under engine which are apparently manufacturer specific, these are 04166 and 20572. Can anyone shine a light on what these two codes relate to? I tried to start car this morning to see how goes and it will start, runs very rough then cut out. Any help would be greatly appreciated.
Tia

 

[SuperV8]

20572 looks like Intake air temp sensor. (P0113)
Can't see any information on 04166.

 

[RUM4MO]

Unfortunately you are discovering what is the "weakness" of Carista, given time they might expand on what these "unique to specific manufacturer" fault codes are, I've had that issue on what might have been an "emergent" AC compressor fault code, they got the actual component/part correct but the actual description of the fault was way out or random or just an error on their part. Scanning your car with a proper VW Group compliant scan tool like VCDS would give a correct answer to what these fault codes are.

Okay most buyers of Carista are not really into diagnosing all possible faults, just the "regular" ones, and it is good enough for that, I only use it for "on the road" fault diagnosing and have VCDS for working on our family cars back home, so for me, limiting its use to that works okay for me.

 

[Vintagesteak88]

Thankyou for the help, I have RAC on the way to have a look also, I will keep you all updated on how that goes