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Drive a 2014 tdi jetta. Fully deleted and tuned, hit a pothole and as soon as i put it under a decent amount of load it goes into limp mode and throws a p0299 underboost code. Checked for vacuums leaks and there were none. Maf is at 15g/s at idle and seems high even though its brand new also has a p0135 o2 heater code that popped up afterward. All boost pipes look fine and it only usually happens when i hit around 60-70 while hammering it.
How long has your 2014 Volkswagen Jetta had this problem?
More than a month
1 Reply
Hello, I’m Pete from the Car Genius team at RepairPal. I’m sorry you’re dealing with this concern on your Jetta. Based on the information provided with how the vehicle is acting as well as the codes that are coming up and when this concern occurred these can all point to a boost leak that may not be visual to the naked eye, a wiring concern leading to the boost pressure sensor and oxygen sensor, or possibly even an internal electrical fault in the ECM itself. In some cases finding a boost leak can require the use of a smoke machine. I recommend having the vehicle checked and tested for a boost leak as well as wiring checked over for any concerns. If no issues are found then further testing will need to be performed to help pinpoint the component at fault. I wish I had some better news to give you on this. If you’d like to find a trusted, certified repair shop in your area, you can check here: https://repairpal.com/certified. If you need more advice, or have any further questions about your vehicle, we’re here to help. Just give us a call at 877-913-1554 where we will be happy to assist!