Trouble light on. How to I correct problem? 2004 Honda Accord 4cyl 138,000 miles

 

Any recent work done to the car?

P0325 is a fault in the knock sensor circuit. The real problem can be a bad knock sensor, corroded/poor connection in the electrical connector to the knock sensor, bad/damaged wiring to the knock sensor, or possibly the PCM. Inspect the wiring to the knock sensor and unplug the sensor to look for any obvious corrosion.

We can give you some electrical testing to make sure you identify the problem. Odds are likely the knock sensor is bad if there is no obvious damage to the wiring/electrical connector.

 

The knock sensor is located under the intake manifold. The knock sensor is not easily accessible without removal of the intake manifold.

Was the starter replaced recently? If so, it may not have been plugged back in correctly or the harness wiring damaged.

Also, another possibility may be rodent chew of the wiring.