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My check engine light came on and error codes P1123 and P1125 came up.  I replaced the MAS, cleared the codes and the same codes came back on fairly quickly.  

 

Any ideas?

 

Thanks

Chris

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17 minutes ago, wisemoney said:

My check engine light came on and error codes P1123 and P1125 came up.  I replaced the MAS, cleared the codes and the same codes came back on fairly quickly.  

 

Any ideas?

 

Thanks

Chris

 

Yes, you went after the wrong thing.  Both codes indicate an overly rich condition that the system cannot compensate for, possibly from a high fuel pressure issue, leaking injectors, or a stuck EVAP purge valve.  Lesson here is to learn what the codes are telling you before reaching for a credit card...…………..

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Posted (edited)

Thanks.  I have the Bluedriver diagnostic tool and their top rated fix was to replace MAS.  Next they have replace fuel pressure regulator,  replace crankcase ventilation and replace EVAP.  See picture attached.

 

Any ideas of next best steps?

 

Thanks

Chris

IMG_2324.PNG

Edited by wisemoney

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16 minutes ago, wisemoney said:

Thanks.  I have the Bluedriver diagnostic tool and their top rated fix was to replace MAS.  Next they have replace fuel pressure regulator,  replace crankcase ventilation and replace EVAP.  See picture attached.

 

Any ideas of next best steps?

 

Thanks

Chris

IMG_2324.PNG

 

I'd start by checking the fuel pressure, then looking at the EVAP purge valve (they can often be cleared with a quick blast of compressed air).  I would also look at the fuel trims.   I have no idea why they list the MAF, it is not even mentioned in the factory  OBD II manual for the car decision tree for diagnosing the codes.  Once of the biggest issues with a generic OBD II scanner is they often list fixes that may have worked on a Ford Fiesta, but totally do not pertain to your Porsche. For example, while they do point out valid possibles, I have no idea how replacing a brake booster is going to help an overly rich A/F mixture issue...………..

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Posted (edited)

I blasted the EVAP purge valve i believe - see pictures from left top of engine bay (i dont think it did anything). 

 

Not sure how to check the fuel pressure.  I notice at idle the RPMs surges up and down a bit around the 1000 mark, but once moving the car seems to be running well.

 

Am i to reset codes every time i do something to see if it worked?

 

Getting frustrated. lol  I wish i could get it fixed.

 

Thanks

Chris

IMG_2326.jpg

IMG_2327.jpg

Edited by wisemoney

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39 minutes ago, wisemoney said:

I blasted the EVAP purge valve i believe - see pictures from left top of engine bay (i dont think it did anything). 

 

Not sure how to check the fuel pressure.  I notice at idle the RPMs surges up and down a bit around the 1000 mark, but once moving the car seems to be running well.

 

Am i to reset codes every time i do something to see if it worked?

 

Getting frustrated. lol  I wish i could get it fixed.

 

Thanks

Chris

IMG_2326.jpg

IMG_2327.jpg

 

Does that purge valve stay closed (hold vacuum or pressure)?  You check the fuel pressure by attaching a fuel pressure test gauge to the test port on the fuel rail, and then check your pressures running and shut off.  Can you use your OBD device to read fuel trims?

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Thanks but i do not have any of those tools to test those two issues.  I guess its off to Porsche.  Thanks anyways for your quick replies.

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Update - i reset the code after blowing out the purge valve and the check engine light has not come back on yet.  Keeping my fingers crossed.  I ordered one off ebay for $45 as a backup which is much cheaper than taking to Porsche for diagnostic.

Edited by wisemoney

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It'd be a good idea to get a Porsche specific scanner ( Durametric comes to mind). Rich and/or lean running conditions are really bad for the M96 platform and can/will lead to much bigger problems. I recommend reading up on them (without hyping the potential horrors) before throwing money/plastic at the problem(s). Proper diagnosis will save you big $ in the long run. Good luck

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The Durametric tools seem very expensive.  What one would you recommend for all round use?  I also see icarsoft brands that i had for my mercedes.

 

What would be the best value make and model from all the brands?

 

Thanks

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13 minutes ago, wisemoney said:

The Durametric tools seem very expensive.  What one would you recommend for all round use?  I also see icarsoft brands that i had for my mercedes.

 

What would be the best value make and model from all the brands?

 

Thanks

 

No such system exists.   Just about every OEM has areas of “proprietary code” which require a dedicated system to pull codes and conduct diagnostics.   Porsche is one of the worst in this respect, with several major systems “off limits” to many diagnostic systems.  As far as the Durametric seeming expensive, the next step up in Porsche diagnostic systems, the current version of the PIWIS system, starts at $20,000 a year.

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