P0300

DTC P0300: Random Misfire Detected and Any Combination of the Following:

DTC P0301: No. 1 Cylinder Misfire Detected

DTC P0302: No. 2 Cylinder Misfire Detected

DTC P0303: No. 3 Cylinder Misfire Detected

DTC P0304: No. 4 Cylinder Misfire Detected

NOTE:
- If the misfiring is frequent enough to trigger detection of increased emissions during two consecutive driving cycles, the MIL will come on, and DTC P0300 (and some combination of P0301 through P0304) will be stored.
- If the misfiring is frequent enough to damage the catalyst, the MIL will blink whenever the misfiring occurs, and DTC P0300 (and some combination of P0301 through P0304) will be stored. When the misfiring stops, the MIL will remain on.

1. Troubleshoot the following DTCs first if any of them were stored along with the random misfire DTC(s):
P0107, P0108, P1128, P1129: Manifold absolute pressure (MAP) sensor
P0131, P0132: Primary heated oxygen sensor*
P0171, P0172: Fuel system
P0335, P0336*4 (P0339)*5: Crankshaft position (CKP) sensor
P0340, P0341: Camshaft position (CMP) sensor ('03 model)
P0401*4, P1491*4, P1498*4 (P0404, P0406)*5: Exhaust gas recirculation (EGR) system*3
P0505*4 (P0506, P0507)*5: Idle control system
P1149*4, P1162*6, P1163*3, P1164*3, P1165*3 (P0133, P2A00)*5: Air fuel ratio (A/F) sensor*2
P1259 (P2646, P2647)*5: VTEC system*3
P1361, P1362: Top dead center (TDC) sensor ('01-02 models)
P1591*4 (P0511, P0506, P0507)*5: Idle air control (IAC) valve

*1:D17A1, D17A2 engines
*2:D17A6 engine
*3:D17A2, D17A6 engines
*4:'01-03 models
*5:'04 model
*6:'01 model

2. Test-drive the vehicle to verify the symptom.




3. Find the symptom in the chart, and do the related procedures and checks, in order listed, until you find the cause.