Knock Sensor 1 Circuit (Bank 2 or Single Sensor)

What is P0325?

P0325 indicates a problem with the knock sensor circuit, which monitors engine vibrations to prevent damaging pre-ignition. This is a high-severity powertrain code that often triggers when the sensor fails or its wiring is compromised, particularly in Honda Accord and Dodge Ram models. Based on real data, this code frequently appears alongside serious engine issues like misfires and can lead to expensive repairs averaging $3,331.

Common Causes

• ●Failed knock sensor itself, especially in Honda Accord 1.5T engines around 80,000 miles
• ●Wiring or connector issues in the knock sensor circuit
• ●Engine mechanical problems like head gasket failure that trigger sensor readings

Symptoms You May Notice

• ●Engine misfires, particularly on cylinders 1 and 2 as reported by Honda Accord owners
• ●Vehicle entering limp mode with reduced power and performance
• ●Illuminated check engine light with possible engine knocking sounds

How to Fix It

• ●Knock sensor replacement ($100-$400, moderate difficulty for DIY but only attempted in 2% of cases)
• ●Complete engine repair including head gasket replacement when underlying engine damage exists ($1,500-$3,500, high difficulty)
• ●Wiring harness inspection and repair for circuit issues ($200-$800, moderate difficulty)