P0410, P1411 and P0740

The other day I got codes P0410 & P1411 (SAI Banks 1 & 2). I had gotten these codes before, after I replaced the secondary air injection pump due to a terrible whine sound. After I replaced the pump, I had inadvertently plugged in the power cable for the pump in backwards and assumed I got this error due to the pump being polarized and spinning backwards; I quickly fixed this, cleared the codes, enjoyed being rid of the terrible screaming / whining sound from the pump and minded my own business for a couple months; now I'm back with P0410 and P1411, I tested the pump and it seemed to run perfectly when the car was started up. At this point I gave up trying to diagnose this any further myself and brought the car into the mechanic, they diagnosed the codes, tested the pump and air hoses connected to it without issue. They did, however, note an additional pending fault P0740 - transmission torque converter clutch circuit. For reference, I just had the transmission serviced (car just hit 100k miles) at a different mechanic about 3-4 months ago. Anyhow, the mechanic tested and tested again the pump / air hoses, drove the car 20 miles after clearing the codes and the SAI system check was incomplete. They noted "during the extended test drive in order to set emissions monitors we noticed that the engine temperature was too low - as if the thermostat was stuck open". I spoke with the mechanic on the phone about this and he believes that this may be the culprit to the SAI codes, and could possibly cause the P0740 code - I am not at all mechanically experienced and was looking for your inputs into this matter, and wanted to see if this sounded correct. I had searched online here and 6speed for similar issues with the thermostat possibly causing these issues to no avail, though I did see that the P0410 & P1411 codes are potentially related to engine temperatures being out of range - for P0740 I am completely in the dark. Any help or information is greatly appreciated, thanks!

Im pretty sure the tip is similar to the gt3 with a trans cooler. There is a valve that opens and closes for the trans cooler and when it sticks open the engine water temp stays real low. U should be able to search and find some info to see if it could be your issue.

P0410 P1411 are SAI codes and need repaired to pass Smog tests... PIWIS has a program to run the SAI test in the "drive links" section...This forces it to either pass or fail the test... Since you have both bank 1 and bank 2 your problem is likely from the valve that bolts on top of the crankcase back to the pump itself with includes the vacuum valves and vacuum lines...Someone who knows the system well can test all of it with a simple handheld vacuum pump.... Code P0740 is indeed the Torque Convertor lock-up clutch, common problem on the ZF Tip. Most people just live with the code since they hardly ever notice any symptoms.( and the repair is a new torque convertor due to a 10 cent o-ring that fails internally).....

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I am fairly certain that they tested these lines and valve already, but I will double check to confirm tomorrow. Regarding the torque converter, I haven't had any issues driving the car when it shifts, the only issue I've had is a slight shake when I'm driving 80+ MPH is probably due to the suspension which I am planning on addressing soon, it still has the stock suspension that hasn't been touched and I'm told the rear drivers side shock is leaking... But I digress as that is a different beast entirely.

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If this is indeed the case very interesting, I will bring it up with the mechanic tomorrow and have them check this out.

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Well Okie Dokie then.....maybe I should have said "I" could test all the components with just a handheld vacuum pump...

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Something was indeed wrong with the (main) thermostat, replacing it has solved the temperature issues, however I still have P0740. I connected my simply ODBII reader to the car after the mechanic as the check engine light returned about 5-10 miles of driving after their shop and I immediately saw 4 codes (P0740, P0411, P1411 - all 3 confirmed and a new P1130 - pending). I did not clear any codes. About 5 minutes later I read the codes from the car again, all of the codes except for P0740 had vanished and I have checked and checked again for a couple days now and I am still only seeing P0740. I am a bit confused as to what happened for those codes to disappear? I may just live with the P0740 code, as I have not noticed any issues at all with driving. I could try to fabricate something about when downshifting into X gear it takes 0.08 seconds longer than the others... But really it seems to be not any different from when I got it about 3-4 years ago now. For reference, I had the transmission "serviced" at a different mechanic about 2 months ago. I am no longer using this mechanic for various reasons, but one of which is that they claimed they completed servicing on a Mercedes-Benz automatic transmission for my car ('01 C2) so I am skeptical as to their "servicing". Now my memory is seemingly returning to me... A year or so ago (a couple years after I had the motor rebuilt) I believe I had seen the P0740 code as pending randomly as I was testing my ODBII device. I'd asked about it at a different shop that had rebuild the motor and they explained that code was common, and from his experience driving my car there I shouldn't worry about it since there was no issues driving, pretty much what you told me, which is what sparked my memory because I knew it sounded familiar. So I honestly believe now that I've had this code for a while, probably about 1.5 to 2 years. I guess my next question is, if I did want to address this check engine light by replacing the torque converter, what would the process entail in terms of labor time and cost for parts? I saw a used torque converter on eBay for about $490, or should I avoid this part as used at all costs?

Quotes source post: 18714140

Something was indeed wrong with the (main) thermostat, replacing it has solved the temperature issues, however I still have P0740. I connected my simply ODBII reader to the car after the mechanic as the check engine light returned about 5-10 miles of driving after their shop and I immediately saw 4 codes (P0740, P0411, P1411 - all 3 confirmed and a new P1130 - pending). I did not clear any codes. About 5 minutes later I read the codes from the car again, all of the codes except for P0740 had vanished and I have checked and checked again for a couple days now and I am still only seeing P0740. I am a bit confused as to what happened for those codes to disappear? I may just live with the P0740 code, as I have not noticed any issues at all with driving. I could try to fabricate something about when downshifting into X gear it takes 0.08 seconds longer than the others... But really it seems to be not any different from when I got it about 3-4 years ago now. For reference, I had the transmission "serviced" at a different mechanic about 2 months ago. I am no longer using this mechanic for various reasons, but one of which is that they claimed they completed servicing on a Mercedes-Benz automatic transmission for my car ('01 C2) so I am skeptical as to their "servicing". Now my memory is seemingly returning to me... A year or so ago (a couple years after I had the motor rebuilt) I believe I had seen the P0740 code as pending randomly as I was testing my ODBII device. I'd asked about it at a different shop that had rebuild the motor and they explained that code was common, and from his experience driving my car there I shouldn't worry about it since there was no issues driving, pretty much what you told me, which is what sparked my memory because I knew it sounded familiar. So I honestly believe now that I've had this code for a while, probably about 1.5 to 2 years. I guess my next question is, if I did want to address this check engine light by replacing the torque converter, what would the process entail in terms of labor time and cost for parts? I saw a used torque converter on eBay for about $490, or should I avoid this part as used at all costs?

Do you really want to pull the engine, split it from the gearbox, and then put a "used" torque converter back in ?

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So definitely a new one then. And to answer your question; no, in fact I don't want to do any of this to begin with

And so far your mechanic and a seasoned porsche mechanic have said u dont need to do it at all. Just pretend that u dont have the code or is that the real problem?

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You're right, I'm a bit of a hypochondriac with this car and any little noise that comes from the vicinity of the engine that I haven't heard before sends a chill down my spine and I tend to assume the worst. I think it's time for me to see some counseling

I'm fairly certain you're right on this one, I need to have that valve checked out when I get a chance. I've just been living with these codes for now. Is that valve something that I could easily access myself? As for the tip code, I cleared it and it hasn't come back. I seem to remember doing this all before... in fact, a couple years ago close to when I got the car I did do the same thing, my memory is just so bad that I forgot about that completely.