P0302: Cylinder 2 Misfire Detected
Updated November 12, 2026
The engine computer has detected that cylinder 2 isn't firing properly. The same checks as any single-cylinder misfire apply: spark, fuel and compression.
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🔧 Want to check this yourself? An OBD2 scanner reads the code; models with live data also show the sensor readings used in the checks below. See code readers and scanners from $24.99 ↓ · Which scanner do I need?
Common causes
- A worn spark plug
- A failing ignition coil or plug wire
- A clogged or failing fuel injector
- A vacuum leak near cylinder 2 or low compression
Code meanings can vary slightly by manufacturer. Use these as a starting point and confirm with your vehicle's service information or a mechanic before replacing parts.
Symptoms
- Rough idle or shaking
- Loss of power
- A flashing check engine light when the misfire is severe
Is it safe to drive?
If the check engine light is flashing, avoid driving to protect the catalytic converter. With a steady light, it's usually OK to drive gently to a shop, but fix it soon.
How to check it with a scanner
- Plug an OBD2 scanner into the port under the dashboard and read all stored codes and the freeze-frame data (the conditions when the code set).
- Swap the cylinder 2 coil with another cylinder and see if the misfire follows it.
- Inspect the spark plug.
- Check the injector and do a compression test if spark is good.
- After a repair, clear the code and drive normally for a few days to confirm it doesn't come back.
A basic code reader shows the code; scanners with live data let you watch sensor readings, which is what you need for most of the checks above. See OBD2 scanners under $100.
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Questions
What does P0302 mean?
P0302 is the generic OBD2 code for "Cylinder 2 Misfire Detected." The engine computer has detected that cylinder 2 isn't firing properly. The same checks as any single-cylinder misfire apply: spark, fuel and compression.
Is it safe to drive with P0302?
If the check engine light is flashing, avoid driving to protect the catalytic converter. With a steady light, it's usually OK to drive gently to a shop, but fix it soon.
How do I check P0302 myself?
Read the code and freeze-frame data with an OBD2 scanner, then: Swap the cylinder 2 coil with another cylinder and see if the misfire follows it. Inspect the spark plug. Check the injector and do a compression test if spark is good.
Related codes
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