Amazon has the Autel MaxiScan MS300 OBD-II Code Reader for $22 with free shipping on $25+. Compatible with 1996 and later OBD II-compliant vehicles, reads and displays Diagnostic Trouble Codes (DTCs). Now you'll know whether you need a new engine or you're just low on wiper fluid.
Does not play well with VW/AUDI
Worked for me on a Passat.
worked fine on my dodge truck.
worth it.