OBD codes / P0301 / Honda Accord
P0301 on a Honda Accord
Cylinder 1 Misfire Detected
K24 four and J35 V6 Accords.
What P0301 usually means on a Accord
P0301 isolates a misfire to cylinder 1. On the Accord the quickest confirmation is to swap that cylinder's coil to an adjacent hole and see if the code moves. On the V6, know your firing layout so you are working on the right cylinder. A lone misfire that persists will overheat and can ruin a catalytic converter, so it is worth addressing promptly.
Most likely causes on this model
- Failed coil on cylinder 1
Coils fail individually on Accord engines; the fault follows the coil when swapped.
- Fouled or worn plug
A single fouled plug - common on the oil-burning V6 - sets a one-cylinder code.
- Injector fault
A clogged or dead injector localizes the misfire to cylinder 1.
- Low compression
A burnt valve or worn rings on one cylinder produces a persistent single-cylinder miss.
What it costs on a Accord
On the four-cylinder, cylinder 1 is easy to reach and a coil is inexpensive. On the V6, cylinder location determines difficulty - front-bank cylinders are simple, rear-bank ones require intake removal. A compression test is the tie-breaker before deeper work.
Year, engine and mileage change the answer. Get a diagnosis for your Accord — it weighs these causes against your exact configuration and real complaint data.
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Honda Accord problems & recalls by year
Based on widely reported patterns for this model; individual causes vary by year, engine and history. Generic P0301 behavior is covered on the main P0301 page. Confirm with a scan tool before buying parts.