P0301 is an error code that indicates a misfire in cylinder 1. This can happen for a variety of reasons, including a faulty spark plug, a dirty air filter, or a problem with the fuel injector. If the problem is not fixed, it can lead to engine damage.
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- error code p0301
- p0301
1. Replace the spark plugs and wires
- Remove the hood and front fascia of the car.
- Disconnect the negative battery cable.
- Remove the four screws that hold the coil pack cover in place.
- Remove the coil pack cover.
- Remove the spark plugs and wires.
- Replace the spark plugs and wires.
- reconnect the battery cable.
- Replace the coil pack cover.
- Restore the screws that hold the coil pack cover in place.
2. Check the ignition coil
- Remove the battery cable.
- Disconnect the negative battery cable.
- Remove the spark plugs.
- Remove the coil cover.
- Check for fouled or damaged coils. Replace any damaged or fouled coils.
- Reattach the spark plugs and battery cable.
- Test the engine by starting it and then turning it off and on.
3. Clean the fuel injectors
- Remove the air filter.
- Remove the fuel injectors.
- Clean the injectors with a solvent and a brush.
- Reinstall the fuel injectors.
- Replace the air filter.
- Replace the fuel cap.
4. Check the engine compression
- Park the car in a secure location with the engine off.
- Remove the air cleaner assembly.
- Remove the spark plugs.
- Compress the engine oil to 30 psi.
- Check the compression on each cylinder.
- Replace the spark plugs, air cleaner assembly, and engine oil if necessary.
5. Check for vacuum leaks
- Check for any vacuum leaks on the air bag system.
- Replace the air bag if necessary.
- Reconnect the vacuum hoses.
- Reinstall the air bag.
If you didn't find success with an option above, then try:
- Replace the fuel filter.
- Check the oxygen sensor.
- Adjust the idle speed.