Help with error code

[Petermark1972]

Hi guys, hope someone can help. My engine warning light came on a while back so I invested in a 'cheap' OBDII reader (think it's a U480). I plugged it in and the reading says:

N/A
01/01

Does that mean it doesn't work on my car or does it mean that it's some sort of MAF error? The handbook isn't very clear.

Any help much appreciated

PS: I reset the code but it came back after about 100 miles or so...

Pete