B+ motorhomes

happyjack2 - I purchased a Scan Gauge II that plugs into the connector right where the steering column disappears under the dash. This little device displays 4 different selectable readouts. It will read your "check engine" code and you can then look up the real cause. Often times it is nothing more than a loose gas cap. You can also clear the check engine light and wait to see if it returns. I paid $159.95 to have it delivered to my door. I find it useful to monitor engine RPM for best fuel mileage (happens to be 2,350), watching the intake air temperature, ignition timing, battery voltage etc. I especially like the portability to different vehicles.

Another option, take the RV to either a "AutoZone", "O'Reilly", or "Advance Auto" and they will usually loan you a tester and show you how to read the code and clear it.