C0721 Engine Error Code
When you check engine light came on code C0721 the reason should be . However your vehicle's manufacturer may have a different definition for the C0721 OBD-II Diagnostic Chassis (C) Trouble Code. So you should chech it on your car models.
C0721 Code Symptoms
Parts or components should not be replaced with reference to only a DTC. The vehicle service manual should be consulted for more information on possible causes of the fault, along with required testing.
Disconnected, dirty or fouled spark plugs are common causes for engines that won't start. Spark plugs typically need to be replaced every season or 25 hours of use. You should also check that the spark plug gap is set properly. If your spark plugs look good, problems with your ignition system can also preventing a spark. These can range from a faulty spark plug lead, shorted kill switch or flywheel key damage.
C0721 OBD-II Diagnostic Chassis (C) Trouble Code Descriptionso you have to check ODB-II Engine Error Code list.
C0721 Code Review :The reason of C0721 OBD-II Engine Error Code is .
C0721 Code Dictionary Meaning:
c - Chassis Code - Problem is controller area network wiring bus and modules.
0 - SAE - Generic
7 - Ignition System Or Misfire
2 - Cruise Control Servo Indicates Low
1 - PCM Stack Overrun