P0301 on a Honda Accord
P0301 means cylinder 1 Misfire Detected. On the Accord, a few causes come up far more than others.
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 common causes on the Accord
- 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 P0301 costs to fix 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. Start a case and Redline weighs these causes against what your car shows, then names the check that would settle it.
Other codes on the Honda Accord
Related symptoms
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.
P0301 on your Accord?
Every problem becomes a Case. Tell Redline what your Accord is doing: it shows what the evidence supports, what’s still missing, and what to check next, before you approve a repair.
“Inner pad ~1 mm. Outer pad 3 mm.”
Next: check the slide pins move freely before buying parts.