Alright time to call in the troops. Throwing both p2196 and p0137 codes in my mkv gti FSI. Car is running like crap, irregular idle, rpms sometimes go as low as 500 and almost stall. Seems to be running excessively rich and my fuel mileage reflects that. I've replaced my upstream o2 sensor and that made no difference. What should my next step be in resolving this? Maf sensor, vacuum leaks? Also, could my post cat o2 be the cause of this? I figured the post cat o2 was only there to make sure that the cat was working and wouldn't really affect the performance. Any help is greatly appreciated, I just want my bitch to be healthy again!
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