P0302: Cylinder 2 Misfire Detected
GarageDex's OBD-II reference explains that code P0302 means "Cylinder 2 Misfire Detected" - Cylinder 2 is misfiring - failing to burn its charge correctly.
High - get it diagnosed before driving much
Steady light: drive gently to a fix. Flashing: stop to protect the catalytic converter.
Symptoms
- Rough idle and vibration
- Flashing MIL under load
- Reduced power
- Poor economy
Common causes (most to least likely)
- Failed coil or plug on cylinder 2
- Injector fault on cylinder 2
- Localized vacuum leak
- Low compression
How to fix P0302
- Move the cyl-2 coil/plug to another cylinder and re-scan to confirm
- Replace the faulty ignition component
- Check injector and compression next
Guidance only - confirm the cause with a scan before replacing parts. Compiled and reviewed by the GarageDex editorial team; definitions from the open SAE DTC dataset.
Tools & parts for P0302
Confirm the cause before you buy anything - a code points to a system, not a guaranteed part. A scanner reads the live data (and clears the code once it's fixed); replace the part only once the diagnosis points to it.
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Frequently asked
What does the P0302 code mean?
GarageDex's OBD-II reference explains that code P0302 means "Cylinder 2 Misfire Detected" - Cylinder 2 is misfiring - failing to burn its charge correctly.
What are the symptoms of P0302?
Common symptoms: Rough idle and vibration; Flashing MIL under load; Reduced power; Poor economy.
What causes a P0302 code?
The common causes, most to least likely: Failed coil or plug on cylinder 2; Injector fault on cylinder 2; Localized vacuum leak; Low compression.
Is it safe to drive with a P0302 code?
Steady light: drive gently to a fix. Flashing: stop to protect the catalytic converter.
How do I fix a P0302 code?
Move the cyl-2 coil/plug to another cylinder and re-scan to confirm Replace the faulty ignition component Check injector and compression next Confirm the cause with a scan before replacing parts.