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.