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01 Reported symptoms

The vehicle shakes while idling, especially when stopped at traffic lights. The check engine light is active, and the provided OBD code is P0302. P0302 usually indicates a misfire detected in cylinder 2.

02 Most likely causes

03 Safety assessment

This issue should not be ignored. A misfire can damage the catalytic converter if the vehicle is driven for too long. If the check engine light is flashing, stop driving and have the vehicle inspected as soon as possible.

04 Can you keep driving?

Short local driving may be possible if the vehicle is stable and the check engine light is not flashing. However, continued driving with a misfire can increase repair costs. A mechanic should inspect the vehicle soon.

05 What to check first

• Inspect spark plug on cylinder 2
• Swap ignition coil from cylinder 2 to another cylinder and see if the misfire follows
• Check fuel injector operation
• Inspect wiring and connectors
• Perform compression test if the issue remains

06 Questions to ask your mechanic

• Can you confirm whether the misfire is still on cylinder 2?
• Can you test or swap the ignition coil before replacing multiple parts?
• Are the spark plugs worn or oil-fouled?
• Is the injector working properly?
• Is a compression test needed?

07 Common unnecessary repairs to avoid

Do not replace expensive parts before confirming the basic causes of the misfire. Avoid replacing the catalytic converter, ECU, or multiple sensors unless proper testing confirms they are faulty.

08 Mechanic brief

The vehicle has rough idle, shaking, check engine light, and OBD code P0302. Please inspect cylinder 2 ignition coil, spark plug, injector operation, wiring, and compression before replacing expensive components.

09 Final notes

This report is based only on the information provided by the user. It is not a certified mechanical diagnosis and does not replace inspection by a qualified mechanic.