P0303

[PO303] The scan tool indicates Diagnostic Trouble Code (DTC) P0303: Cylinder 3 misfire detected.

NOTE: If some of the DTCs listed below are stored at the same time as a misfire DTC, troubleshoot those DTCs first, then troubleshoot the misfire DTC.

PO1O6: MAP sensor
P0171, P0172: Fuel supply system
PO4O1, P1491, P1498: EGR system
P0441: EVAP incorrect purge flow
P1359, P1361, P1362: TDC sensor
P1381, P1382: CYP sensor

Possible Cause
- Fuel injector: clogging, fuel leakage, air leakage
- Fuel injector circuit: open or shorted
- Injector resistor: malfunction
- Spark plug: carbon deposits, fouling, malfunction
- Ignition wires: open, leaking
- Distributor: malfunction
- Compression: low
- Valve clearance: out of spec