P0302: Cylinder 2 Misfire Detected
Can you still drive? Not recommended if the check engine light is flashing. Continuous misfires can damage the catalytic converter and increase emissions.
What Does P0302 Mean?
Code P0302 indicates that the engine control module has detected a misfire in cylinder 2. The ECM monitors crankshaft rotational velocity and identifies that cylinder 2 is not contributing its expected power. This could be due to ignition, fuel delivery, or mechanical issues specific to that cylinder.
Need to read your codes?
An OBD-II scanner lets you read and clear diagnostic trouble codes from your vehicle's computer. Most scanners work with any car made after 1996.
Browse OBD-II Scanners on AmazonCommon Causes
- Worn spark plug in cylinder 2
- Failed ignition coil for cylinder 2
- Faulty fuel injector
- Low compression due to worn valve or piston ring
- Vacuum leak at cylinder 2 intake port
Symptoms
- Check engine light on or flashing
- Rough idle
- Loss of power during acceleration
- Engine vibration at idle
- Increased exhaust emissions
Diagnostic Steps
- 1Swap ignition coil from cylinder 2 to another cylinder
- 2Replace spark plug in cylinder 2
- 3Test fuel injector with noid light or stethoscope
- 4Perform compression and leak-down test on cylinder 2
- 5Check for vacuum leaks using propane or smoke test
Recommended Parts & Tools
Estimated Repair Cost
| Type | Estimated Cost |
|---|---|
| Total Repair Cost Range | $50 - $1200 |
| Parts Only (DIY) | $50 - $200 |
| Labor (1-3 hrs @ $100/hr) | $100 - $300 |
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Chat with AI About P0302Commonly Affected Vehicles
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Frequently Asked Questions
Is P0302 the same as P0300?
No, P0302 is specific to cylinder 2 while P0300 indicates random misfires in multiple cylinders. P0302 is generally easier to diagnose.
Can a bad fuel injector cause P0302?
Yes, a clogged or leaking fuel injector is a common cause of single-cylinder misfires. A fuel injector balance test can confirm this.
Community Fix Reports
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