The thing is.....Magnuson Moss while helpful, doesn't always save everyone. There very well can be multiple causes for a problem...or possibilities for a problem...and one could be related to something you did, one could be related to something else. Depending on the problem, they could possibly get away with saying it was something you did when in fact it wasn't at all or fully due to that.
Another factor...all these wonderful parts in car (OEM parts)...there are bad parts here and there...obviously...and sometimes one of these parts fails just because it's bad...of course if it's something that fails and could have, under normal circumstances, been damaged due to your driving habits combined with work you've done to the car yourself....well then it's a scapegoat for them.
Another factor...all these wonderful parts in car (OEM parts)...there are bad parts here and there...obviously...and sometimes one of these parts fails just because it's bad...of course if it's something that fails and could have, under normal circumstances, been damaged due to your driving habits combined with work you've done to the car yourself....well then it's a scapegoat for them.