Audi TT 2016: Unsteady engine, black smoke and starting difficulties

Hey, I once had a very similar case with my 2014 Audi A4, it's really bad! Yes, good guess, it was the lambda sensor. It gave up the ghost on mine. There were also several warning signals and the engine was running rough. My garage mechanic checked it immediately and fitted the new sensor. It cost me €375. So, I don't have much experience yet and could be wrong, but maybe that could be the problem for you too? For more specific info, it would be great if you could share more details about the engine and mileage. Hope that helps you!

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Hey, thanks for your reply! That sounds a lot like what I'm going through right now. My Audi TT has about 63865 km on it now. Never really had any problems with it before. The lambda sensor could indeed be the culprit, that makes sense to me. I'll probably have to visit the garage as soon as possible and have it checked before the problem gets any worse. Thanks for the tip!

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Hey, no problem, to be honest, I was pretty relieved when it was all behind me. So if your TT shows similar symptoms, then that could well be the cause. The lambda sensor mixture preparation makes perfect sense. What I would definitely recommend is that you don't wait too long to visit the workshop if you notice that something is wrong with the mixture. It's better to invest a little in the service before something else happens to the engine and the whole thing becomes even more expensive. In my case, the workshop visit was definitely worth it. Sure, the €375 was a lot of money at first, but since then the bike has been running like clockwork again. Plus, the reassuring feeling that everything is sorted out is also worth something. I'll keep my fingers crossed that it goes just as smoothly for you! Keep us up to date. Cheers!

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Hey, thanks for the encouragement! I think I'll follow your advice and not wait any longer to visit the garage. The 375 € sounds like a lot at first, but if it helps my TT to run smoothly again, it's definitely worth it. thanks for sharing your experience.

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Hi, I urgently need help with my Audi A4 B8 (built in 2008, 1.8 TFSI). I'm really desperate and hope someone has some advice. The problem: My car displays the error codes P227900 (air intake system leak) and P017100 (fuel equipment, bank 1 - fuel too lean). In addition, the check engine light is illuminated and the engine jerks from time to time. What I have already done: 1. replaced the following parts: - Lambda sensor - Mass air flow sensor - temperature sensor - Crankcase ventilation 2. further steps: - I sprayed all the relevant points with brake cleaner to find a leak. - At the same time, I monitored the lambda sensor values in the readout device. Observation: The lambda sensor always equalizes the value to around 6.54 in the long term. I no longer know what to do. Does anyone have any ideas as to what else it could be or what I should check? Any help would be great!

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Given the error codes and the steps you've already taken, it seems like there might be a vacuum leak somewhere in the system. This could be due to a cracked or loose hose, a faulty gasket, or even a problem with the intake manifold. I would suggest using a smoke machine to find any potential leaks, as this method is often more effective than using brake cleaner. After you've done this, please update us on your progress.

Hi, thanks for the quick feedback! I have now also checked the entire system with a fog machine, but couldn't find any leaks. Do you have any other ideas on what I could check or try? I would be grateful for any tips!

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Since you've already checked for leaks and replaced several parts, the next step could be to inspect the fuel system. The error code P017100 indicates that the fuel mixture is too lean, which could be due to a faulty fuel pump, fuel pressure regulator, or fuel injectors. I recommend having these components checked by a professional, as this involves dealing with high pressure fuel. Please keep us updated on your progress.

Hello, after replacing a timing chain, the error message P017100 is displayed. What could this be? Thank you LG

(Translated from German)

The error code P017100 indicates a lean condition, meaning that there's too much air and not enough fuel in the air-fuel mixture. This could be due to a vacuum leak, a faulty mass air flow sensor, or problems with the fuel system. However, since this issue occurred after replacing the timing chain, it's possible that the timing is off. I would recommend checking the timing first, as an incorrect timing can cause a variety of issues, including a lean condition. Please let us know how it goes.