24 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHFailed CA Smog
Reported or suspected cause
$10 rubber tube
Reported cause
No successful repair reported for this finding.
1
Identified cause
0
Suspected cause
0
Reported fixes
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Reported cause · Original poster
I threw a bunch of money into new parts like the MAF Sensor, Oil Cap and Gas Cap, and my problem was a $10 rubber tube.
Leading evidence: '$10 rubber tube' (1 discussions report identifying this cause; no attributable repair resolution). Across 1 matching discussions, the most frequently mentioned possible cause is '$10 rubber tube' (1 discussions; 1 report identifying it and 0 suggest it). The most frequently discussed action is 'Check extensively' (1 discussions). For that action, 0 discussions report a resolution and 0 report an unsuccessful attempt. No action has an explicit, attributable resolution report under the current rules. These are forum reports and suggestions, not a confirmed diagnosis.
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Reported cause · Original poster
After all of the work and diagnostics, in my case it was the AOS Bellows Tube.
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Performed · outcome unconfirmed
Sounds like you checked extensively for vacuum leak.
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Performed · outcome unconfirmed · Original poster
I checked the OBDII before the test and there were zero codes and all readiness monitors were OK.
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Performed · outcome unconfirmed · Original poster
The OBD disconnected from the DMV twice during the test.
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Suggestion
The normal solution to this is to disconnect the battery to clear the fuel trim data, but doing so will also set you back to square 1 for emissions readiness.
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Outcome without a verified action link
A new Oil Cap, Gas Cap and MAF Sensor did not solve the problem.
I have a 1999 Carrera Coupe with 56k miles.
All stock.
I took it in to get smogged today.
Car was properly warmed up and it passed the emissions part of the test with no problems.
It failed the OBD System Checks.
I checked the OBD the other day and everything was clear, no codes.
All readiness monitors were complete
The OBD disconnected from the DMV twice during the test. Not sure if that is relevant.
Now, after failing, I have the O2 sensor codes 1124 and 1126 and the check engine light is on.
Not sure where to go from here.
Any input would be appreciated.
This one could be potentially frustrating. Good luck. Macster is also on this forum.
http://www.renn-list.com/CEL-issues_10411389.html
https://www.6speedonline.com/forums/...124-p1126.html
http://pedrosboard.com/read.php?7,18159,18181
Clear the codes, drive it for a couple of days check for pending codes or if it throws codes again you might have to bite the bullet and buy some o2 sensors.
Before you reset the OBDII, try to read the emission readiness flags ( SAI, O2 sensors, evap, etc) and see if any of them is not set. When you reset the OBDII, the readiness flags will be reset at the same time. You need those flags to be set to pass smog.
1124 & 1126 are not O2 sensor codes. Those codes are telling you the DME is trying to compensate for a lean running engine (at idle) by enriching fuel, on both banks. Most likely caused by air intake leak, clogged fuel filter and bad fuel regulator. Not sure how intrusive the smog inspection was but it's entirely possible a vacuum line was knocked off which caused air leak.
thanks for the replies.
I�m trying to hunt down a vacuum leak, but not sure how to do it other than spraying carb cleaner around.
I checked the OBDII before the test and there were zero codes and all readiness monitors were OK. I was good to go.
The smog tech kept trying to start the car in second gear and stalled it 4 or 5 times during the test. The OBDII cable fell out twice and disconnected from the state computers.
I don�t know if it is a coincidence or not, but watching my car get abused for 15 minutes and then having a CEL and new codes, I find a bit strange.
Usually the best way to find a vacuum leak is to do a smoke test. There are lots of info and videos on how to do it, from using a professional smoke machine, to a DIY homemade machine, to using cigar smoke and a rubber tube.
Visually check all the vacuum hoses. Remove the oil filler cap when the engine is idling. The engine should stumble and race. If not, there is a gross leak. Check the oil filler tube for cracks. Also check where the airbox connects to the throttle body for good seal.
Reset the OBDII and drive the car for a few days and see what codes come back.
I had a smoke test done by NARW in Reseda when I had a CEL and codes 1123/1125. Turned out my Fabspeed Intake was the cause, not a vacuum leak. DME was trying to compensate for a lean condition caused by turbulence around the MAF as the FS intake didn’t have the return elbow. Put the stock intake back on and voila, all good. Are you running a stock airbox?
Thanks for the replies.
Pulled the oil cap and engine stumbled. Can�t find any cracks in the oil filler tube. I will clear the codes. They will cause a fail in the next smog attempt anyway.
I will look into a smoke test and try to get that done.
Everything is bone stock except for fabspeed mufflers.
I cleared the codes today and drove for a good bit. I also cleaned the MAF yesterday.
None of the codes came back and the CEL has stayed off.
The car runs really well.
6 of the 8 readiness monitors are OK and the other two should be OK soon.
I will update this post after my next run at the smog check.
Thanks for all of the replies so far.
Same thing happened to me right after having it serviced. Mechanic had reset codes but car needed running, on frewwway and in town for about 150 miles before settings allowed smog to pass
Took it for a drive yesterday and the CEL came back on with 1124 and 1126 codes.
I ran a smoke test yesterday with a a cigar and hand pump from Harbor Freight. I was able to pressurize the system with smoke and could not find any leaks.
I will try a new MAF. Oil and Gas caps on order as well, they are cheap and easy.
It would be so satisfying to sort this out by myself before I bring it to a Porsche Mechanic.
I will update this thread with results in a day or two.
Thanks.
Note that the car may run poorly after installing the new MAF. The normal solution to this is to disconnect the battery to clear the fuel trim data, but doing so will also set you back to square 1 for emissions readiness.
Thanks for the tip. I got and extension on my temporary tags, so I�m okay waiting for the readiness codes while I drive and enjoy the car.
The car runs great, so I�m not convinced it�s the MAF, but what the heck do I know? 😀
A new Oil Cap, Gas Cap and MAF Sensor did not solve the problem.
I finally replaced the AOS Bellows, which had several holes and was leaking.
I now have 200 plus miles with no codes.
I will update this thread if the codes come back.
Otherwise, I'm hoping this was the answer.
Thanks to all who replied.
I believe you have found the culprit, the bellows was leaking in unmetered air which caused the fuel trim to go to the rich limit. Running a crankcase vacuum test (AOS test) would have shown LOW vacuum, instead of the usual HIGH vacuum like when the AOS diaphragm is busted.
BTW props to you on your home-made smoke machine
Wow, is that whole thread current for me right now.
Picked up my car from the mechanic, started to idle rough, went to get it smogged, idle between 800-1200. Passed smog, leak clearly audible.
On the way back to the mechanic it threw a CEL, 1124 and 1126. We did smoke test the while engine, no leak. Now we think it is the AOS that failed, or it could be the bellow just as here?
My car had increased oil consumption over the last few thousand miles.
Anyways, I read this thread yesterday morning, and now again, it now feels like a weird deja-vue.
I didn't want to let this thread die without a definitive answer to my problem.
While trying to find an answer to my situation, I searched and read many threads from different forums about the 1124 and 1126 codes, but it seemed like not many of the thread starters ever came back to post their solution.
My car passed smog today with no problems.
After all of the work and diagnostics, in my case it was the AOS Bellows Tube.
If you have found this thread from searching for codes 1124 and 1126, have a look at your AOS Bellows Tube!
I threw a bunch of money into new parts like the MAF Sensor, Oil Cap and Gas Cap, and my problem was a $10 rubber tube. Easily replaced with some skinned knuckles and a lot of cussing.
The positive is that I now have some good spares for the above mentioned and my home made smoke machine was really cheap ( $7 for the pump at Harbor Freight and $2 for a cheap cigar)
Thanks you to all of those who replied and helped.
