The P0303 code means that cylinder 3 is misfiring or is randomly misfiring Start by checking for intake leaks and if no leaks are found the next step is to replace the spark plugs on cylinder 3 If the problem persists more tests need to be done to diagnose the problem, see "Possible Causes" Trouble Codes Turn On Your Check Engine Light If your "Check Engine Light" is on, it means your vehicle has one or more OBD II Trouble Codes The "Malfunction Indicator Lamp" (or MIL ) comes on to warn you when the Onboard Diagnostic System (OBD II) detects a problem that cold cause your vehicle's emissions to exceed 15 times the legal limitRossTech, LLC 1 Sumneytown Pike Lansdale PA , USA Tel 1 267 638 2300
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