P0325 on a Honda Accord
P0325 means knock Sensor 1 Circuit Malfunction (Bank 1). On the Accord, a few causes come up far more than others.
What P0325 usually means on a Accord
P0325 indicates the Accord's knock sensor circuit has failed, leaving the ECU unable to detect detonation, so it retards timing defensively. You may feel a slight loss of power or drop in economy while it is set. On Honda engines the sensor, its connector, or wiring is the usual fault. On the V6 the sensor sits in the valley under the intake, which drives up labor.
Most common causes on the Accord
- Failed knock sensor
The sensor fails with age and heat, opening the circuit on Honda engines.
- Harness or connector damage
The knock-sensor wiring near the block chafes or corrodes over time.
- Poor ground or ECU connection
A degraded ground mimics a bad sensor.
What P0325 costs to fix on a Accord
On the four, the part is modest and access reasonable. On the V6 the sensor lives in the valley beneath the intake manifold, so labor dwarfs the part cost. Inspect the connector and wiring first before ordering a sensor.
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 P0325 behavior is covered on the main P0325 page. Confirm with a scan tool before buying parts.
P0325 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.