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Skoda Fabia 1.4 AQW 2003 - MIL on, codes 16556 and17549 #

Posted by Jeff Perrin on April 1, 2010, 3:54 pm

Year of Manufacture *: 2003
Engine Code or CC *: AQW

MIL light coming on with codes 16556 and 17549. One relates to bank 1 running rich, the other to engine load measurement (in this case map sensor). Both codes are intermittant, we have fitted a new map sensor but to no avail. No egr is fitted to the car and is a basic system. Any ideas on why the codes should keep coming back?
Many Thanks

Re: 2003 Skoda Fabia 1.4 code 16556 and17549

Posted by Pete Mutlow <iframe src='https://members5.boardhost.com/ukautotalk4/info/user=UKAT1569' width='330' height='300' border=0 style='border:none;'> on April 1, 2010, 6:08 pm, in reply to "2003 Skoda Fabia 1.4 code 16556 and17549"
Peter Mutlow

Hi Jeff,

How is this vehicle running and what are the gas readings?

Regards

Pete M

Re: 2003 Skoda Fabia 1.4 code 16556 and17549

Posted by Alan Kane <iframe src='https://members5.boardhost.com/ukautotalk4/info/user=UKAT5535' width='330' height='300' border=0 style='border:none;'> on April 3, 2010, 6:23 pm, in reply to "2003 Skoda Fabia 1.4 code 16556 and17549"
Alan Kane - Administrator

17549 load cross check implausible could be caused by anything that will effect the load data (calculated value). One of the main inputs to this calculated value is the MAP sensor. A high MAP signal will also cause it to run rich and so could cause the other code which is for fuel trim rich. I think you have taken the codes too literally without looking at what will cause them to set. I would be looking for a mechanical issue which is effecting manifold vac.
On that engine a worn timing chain can cause this.

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