P0302

Q: What does OBD2 code P0302 mean?

P0302 means: Cylinder 2 Misfire Detected. A misfire has been detected in cylinder 2. Repeated misfires can damage the catalytic converter and oxygen sensors.

Cylinder 2 Misfire Detected

A misfire has been detected in cylinder 2. Repeated misfires can damage the catalytic converter and oxygen sensors.

SeverityCritical

CategoryEngine

Est. Repair Cost$50–$350

Code TypePowertrain

DIY RepairYes

⚡ Common Causes

›Worn spark plug cylinder 2
›Failed coil-on-plug cylinder 2
›Injector failure on cylinder 2
›Burnt valve or low compression

⚠️ Symptoms

›Rough idle
›Check engine light on
›Reduced power and acceleration
›Possible raw fuel smell

✅ How to Fix — Step by Step

Step 1:Replace spark plug cylinder 2
Step 2:Replace ignition coil
Step 3:Test or replace fuel injector
Step 4:Perform leak-down test on cylinder 2

💡 Pro Tip: Check for oil on the spark plug tip — it indicates a leaking valve cover gasket affecting the coil.

Repair Cost Estimate

Full Repair Estimate

$50–$350

DIY Possible?

YES

Severity

Critical

Frequently Asked Questions

What does OBD2 code P0302 mean?+

P0302 stands for Cylinder 2 Misfire Detected. A misfire has been detected in cylinder 2. Repeated misfires can damage the catalytic converter and oxygen sensors.

What causes code P0302?+

Worn spark plug cylinder 2; Failed coil-on-plug cylinder 2; Injector failure on cylinder 2; Burnt valve or low compression

How do I fix code P0302?+

Replace spark plug cylinder 2; Replace ignition coil; Test or replace fuel injector; Perform leak-down test on cylinder 2

How much does it cost to fix P0302?+

Estimated repair cost for P0302 is $50–$350.

Is P0302 DIY-friendly?+

Yes — P0302 is generally DIY-friendly with basic tools.