The Bluetooth OBD2 would probably be a good investment, $15-$25, assuming you have a smart phone that can run FREE APPs
Live Data can save you lots of time, you can see the voltage or data from each sensor in real time , just like computer is seeing it, so can see if its a sensor issue
Live Data can save you lots of time, you can see the voltage or data from each sensor in real time , just like computer is seeing it, so can see if its a sensor issue