worry only about your challenger. buy the service manual CD. it has everything needed to completely repair your challenger. it has step-by-step diagnostic routines with full diagrams. this is what the dealer tech uses to work on these cars.
you can buy it from dodges website. it cost $120.
https://techauthority.gltghosting.com/webapp/wcs/stores/servlet/ItemDisplay?catalogId=10051&storeId=10051&itemId=29461&langId=-1&searchtype=keyword&skuSearchField=4&skuSearchParam=service%20manual&qty=0
and if you wait, sooner or later the bootleg version will show up on Ebay for $5.
you can buy it from dodges website. it cost $120.
https://techauthority.gltghosting.com/webapp/wcs/stores/servlet/ItemDisplay?catalogId=10051&storeId=10051&itemId=29461&langId=-1&searchtype=keyword&skuSearchField=4&skuSearchParam=service%20manual&qty=0
and if you wait, sooner or later the bootleg version will show up on Ebay for $5.