Hello everyone,

I have been experiencing a higher than usual gas consumption lately and a very slight rough idle intermittently, I scanned it and returned no errors, I still cleaned the MAF and throttle body just in case and few weeks later, the service engine light came on and scanned it and got codes P0101 and P01B
I cleared the codes and it has been a week and so far the codes never came back on

Is there a way to test the MAF to determine which one is defective or if both defective?
note: there is not vacuum leak

I also found some aftermarket cheap options on Amazon, around 30$ , are these any good if I end up needing to replace mine, or should I go for OEM for this, the OEM is around $250-$300 each

Thanks in advance