P0302: Cylinder 2 Misfire Detected

The P0302 error code stands for "Cylinder 2 Misfire Detected." This code indicates that the engine control module (ECM) has identified a misfire in cylinder 2. A misfire occurs when the combustion process in the cylinder is incomplete or not occurring at all, which can result from issues with fuel delivery, ignition or compression.

Importance of addressing P0302

It's crucial to address error code P0302 because a misfiring cylinder can lead to various engine performance problems. Ignoring the issue can result in reduced fuel efficiency, increased emissions, and potential damage to the catalytic converter. Additionally, persistent misfires can cause severe engine damage and lead to costly repairs.

Can I safely drive my car with error code P0302?

Yes, you can drive your car while showing error code P0302, but it's not advisable. Driving with a misfire can cause further engine damage and may leave you stranded if the problem worsens. It is best to have the issue diagnosed and repaired promptly to prevent more significant problems.

Common symptoms of P0302

Some signs that your engine may be suffering a misfiring cylinder include:

• Check engine light is on

• Rough idle

• Engine stalling

• Lack of power and acceleration

• Poor fuel economy

• Engine hesitation during acceleration

Diagnosing P0302

Diagnosing the P0302 error code involves several steps:

• OBD-II scanner: You or a mechanic will use an OBD-II scanner to retrieve the trouble code and any related codes.

• Visual inspection: The ignition system, including spark plugs, ignition coils and wiring, is inspected for signs of wear or damage.

• Compression test: A compression test is performed on cylinder 2 to ensure it has adequate compression.

• Fuel system check: The fuel injectors and fuel pressure are tested to ensure they are functioning correctly.

• Leakdown test: A leakdown test may be performed to check for any issues with the cylinder head, valves or piston rings.

Repairing P0302

Some common ways to address the P0302 error code include:

• Replace spark plugs: Worn or fouled spark plugs in cylinder 2 should be replaced.

• Replace ignition coils: Faulty ignition coils should be replaced to ensure proper spark delivery.

• Repair or replace fuel injectors: Malfunctioning fuel injectors in cylinder 2 should be repaired or replaced.

• Fix compression issues: Any issues with compression, such as faulty valves or piston rings, should be repaired.

• Check and repair wiring: Damaged wiring or connectors related to the ignition and fuel systems should be repaired or replaced.

• Clear the code: After repairs, the mechanic will clear the code from the vehicle's computer and perform a test drive to ensure the issue is resolved.

Related reading

Follow the link below to reach our diagnostic check engine trouble codes catalog:
On-board diagnostics (OBD-II) trouble code directory