Alright guys need some help. 2001 audi a4 1.8t has 2 codes. Code for CAS P0340 and code for MAF P0102 (low output).

- Checked all wiring for MAF according to diagram and it all checks out good however when i run live data on it theres absolutely 0 output from MAF. tried changing it and problem still occurs.

- Been told the CAS code was probably due to a bad tensioner. checked it and tensioner was bad also causing timing to be offer a bit. changed tensioner and reset timing correctly and still having the same problem. Also tried changing the CAS and didnt fix it.

Literally have no idea what else to do. Somebody help me out. Car idles fine. Havent been able to drive it much but from what i have driven it, it was fine. Previous owner knew absolutely nothing about the car, but said both these codes were on it when he bought it and drove it like this for 6+ months