P0302 Code: Meaning, Symptoms, Causes & Fixes
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Causes ranked by likelihood
| Cause | Likelihood | DIY difficulty |
|---|---|---|
| Bad spark plug on cyl 2 — Easiest fix. | Most likely | 2/5 |
| Failing ignition coil on cyl 2 — Swap-test with another cylinder. | Possible | 2/5 |
| Faulty injector on cyl 2 — Check resistance and spray pattern. | Less likely | 2/5 |
Symptoms of P0302
- Vibration at idle
- Power loss
- CEL
How to diagnose P0302
- Confirm the code. Read P0302 with an OBD-II scanner and note the freeze-frame data (speed, temperature, load) recorded when it set.
- Check for companion codes. Look for other stored or pending codes such as P0300, P0301 — they often point to one shared root cause.
- Check: Bad spark plug on cyl 2. Easiest fix.
- Check: Failing ignition coil on cyl 2. Swap-test with another cylinder.
- Check: Faulty injector on cyl 2. Check resistance and spray pattern.
- Clear and verify. After the repair, clear the code and complete a full drive cycle to confirm P0302 does not return.
Can I drive with P0302?
No, especially if the check engine light is flashing.
Related codes
Related symptoms
Frequently asked questions
What does P0302 mean?
P0302 means cylinder 2 misfire detected. P0302 means cylinder 2 is misfiring. Diagnosis is identical to P0301 — start by swapping the cylinder 2 spark plug and coil with another cylinder.
Can I drive with code P0302?
No, especially if the check engine light is flashing.
What is the most common cause of P0302?
Bad spark plug on cyl 2 — Easiest fix.
What are the symptoms of P0302?
Vibration at idle, Power loss, CEL.
How much does it cost to fix P0302?
A typical shop repair range is $30–$600, depending on which cause it turns out to be. Cheaper causes such as faulty injector on cyl 2 should be ruled out first.