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Urgent Help Needed the car is at the garage for MOT

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Happy new year guys, please advise on the following,

The car is now at the dealer, with the following serious issues:

1. Huge Fuel Consumption (avg 50 liters / 100 KM) - 4.7 MPG

2. Extremely high emissions on the exhaust, like 10 times more than normal, plus smoke. White/bluish smoke.

They are not sure what it is, the car has been there for 2 weeks, please give me something to tell them at least... they are so incompetent, it is unbelievable.

I was supposed to renew the MOT, but with these emissions, there is NO WAY !

What could it be ?

So far, the coils and sparks turned out OK, whatever else they verified they said it checked ok... still the smoke, high emissions and 4.7 MPG.

Edited by poleposition
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The car was serviced only at Porsche Dealer, no major repairs, before this MOT, everything was fine.. well, i've noticed a bit of smoke when the engine was cold, but that was it.

Head-gasket is ok, coolant level ok.

They mentioned a few hours ago the lambda probes, but this morning they said they were ok. Sorry, it is 9PM here :)

So they can't give me an answer for the 4.7 MPG fuel consumption... or could this be from the lambdas ?

I hope they will give me some error codes for me to post.


Edited by poleposition
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If it developed a misfire due to a faulty coil pack and it has now been replaced, clear all codes and road test the vehicle to complete at least one drive cycle. You might be trying to repair a problem that doesn't exist due to the fact that the DME is still adapting from the misfire fault.

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Just got a call from the garage:

They told me the emissions are now perfect, what they've done was, and i quote "a reset/self cleaning procedure on the lambda probes", and all is fine now. And of course the car passed the MOT.

Do you have any idea what that means ?

Edited by poleposition
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