Hi, so I have a 2003 Skoda Octavia that was my mum's from 6 months old but it always had an intermittent problem of revving itself when sitting at traffic lights etc.   My mum had many people look at it over the years and never got a clear answer and despite having some work done (I think it had a new sensor at one point but not sure which) it always came back.   When I took the car over 2 and a bit years ago I wanted this sorted so got a diagnostic check and made enquiries and got told it may be the intake manifold gaskets, so I had them replaced and this seemed to fix it until last week.   Now I have had another diagnostic and the errors P1516, P0101 and P0172(intermittent) have all come up, the mechanic who ran the diagnostic does not think the gaskets would be at fault again so soon but was not sure what the 3 codes combined could mean.   Does anyone have experience of these 3 codes all appearing together and found a solution which may help us possibly pinpoint my issue, please?   Thanks in advance for any suggestions.

Try cleaning throttle body or buy a used one from eBay / scrapyard

Try these. 

http://wiki.ross-tech.com/wiki/index.php/17924/P1516/005398

 

http://wiki.ross-tech.com/wiki/index.php/16556/P0172/000370

 

http://wiki.ross-tech.com/wiki/index.php/16485/P0101/000257

 

@ggpowell2 - Step for a hint; what engine is this?

5 minutes ago, KenONeill said:

@ggpowell2 - Step for a hint; what engine is this?

1.6 Mk 1 Octavia, is that what you mean or do you mean more detail?

On 28/12/2018 at 15:40, ggpowell2 said:

1.6 Mk 1 Octavia, is that what you mean or do you mean more detail?

That'll do it. I'm not sure how you can be getting a P0101 on a 1.6, (that's very definitely a fault on a turbocharged engine) but the other two strongly suggest an N156 valve fault. Specifically, the P1516 says to do further diagnostics on the N156, and the P0172 is caused by the mixture issues from the N156.

On 28/12/2018 at 15:57, KenONeill said:

That'll do it. I'm not sure how you can be getting a P0101 on a 1.6, (that's very definitely a fault on a turbocharged engine) but the other two strongly suggest an N156 valve fault. Specifically, the P1516 says to do further diagnostics on the N156, and the P0172 is caused by the mixture issues from the N156.

P0101 points to MAF sensor. 

On 29/12/2018 at 21:08, Skoda_Driver1972 said:

P0101 points to MAF sensor. 

OP has a 1.6 non-turbo, and they usually have MAPs.

Pretty much every car has a maf. Turboed or not. My old 1.2 cordoba had one in there.

 

Erratic idling is almost signposting a maf problem too..

14 hours ago, KenONeill said:

OP has a 1.6 non-turbo, and they usually have MAPs.

They’re more likely to have a MAF on an efi they normally have MAP on turbo cars.