Generic scanner better than INPA and Bmwscanner?
 

So a friend with E46 (330i 2003) same M54 engine tells me her car doesn't drive forward, only in reverse. But if codes are cleared, the car will drive forward for a bit.
I come and start scanning for codes.
INPA has no transmission error codes and some O2 codes, that's it.
Bmw scanner has more codes.
But none of them show the throttle body code which my cheap scanner showed.
P1632 which is a throttle body.
I feel this is exactly the issue, as the car will drove very slowly, maybe 10kmph, but will not accelerate much.
How can a generic scanner find an error better than bmw specific INPA?

https://i.ibb.co/ccHxgTd/20201121-174708.jpg https://i.ibb.co/sm4qD5q/20201121-174821.jpg https://i.ibb.co/zJ22gyk/20201121-175217.jpg https://i.ibb.co/dKN1cs0/20201121-175226.jpg

The usual answer to the question is complexity. The more advanced the scanner the more avenues for getting lost.

My wife's car would only pulse the gas I could coax 7-8 mph out of it but gas pedal inputs were completely ignored. I figured either throttle position sensor or gas pedal sensor was shot. Turned out to be something caught in the throttle body plate.

Had very similar happen to my car (both X5) I got an error that my IAC valve was shot turned out to be a giant vacxum leak.

In neither case were error codes of much help at all and standard sleuthing found the problem.

Look for massive intake air leak and look for throttle position sensor and pedal position real-time data. Start there see If one of the mission critical elements is out of whack.