MAF sensor wiring S70

[mkr5000]

1998 S70 T5 and I've replaced the MAF sensor with a part from another
car that it is known good.

Yet, I still get a check engine light after driving for a while so
definetly not the sensor.

Is that harness often faulty?

Is it easy to replace?

Anything else that's a possibility?

It may be heat related the way it's acting and I saw on some earlier
cars there is a thermostat that controls the air filter temp?.....but
see nothing like that on my 1998.

Appreciate any thoughts. Thanks.

 

[mkr5000]

Also, has anyone seen the "altitude" or barometric pressure sensor go
bad?

The code I get actually refers to this part but like I say, the check
engine light will go out with the MAF sensor cold and
the battery disconnected.

I can run for days/hours before it comes back on -- unpredictable.