P0325 OBD-II Trouble Code: Knock Sensor Malfunction (Sensor 1, Bank 1)

Our certified mechanics come to you · Get a fair and transparent estimate upfront


Cost of diagnosing the P0325 code

P0325 is a diagnostic trouble code (DTC) for "Knock Sensor Malfunction (Sensor 1, Bank 1)". This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light diagnostic for $154.99 . Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $50.0 off as a credit towards the repair. All our repairs are backed by our 12-month / 12,000-mile warranty.

Cars Estimate* Credit towards follow-up repair Earliest Availability
Ford $154.99 $50.0
Toyota $154.99 $50.0
BMW $164.99 $50.0

*Estimates may vary by market

SCHEDULE P0325 DIAGNOSTIC Get a fair and transparent estimate upfront

P0325 code definition

Knock Sensor Malfunction (Sensor 1, Bank 1)

What the P0325 code means

P0325 is a general ODB2 diagnostic trouble code associated with the knock sensor circuit. This code may be seen with other knock sensor codes and lean condition codes.

P0325 means that there is a malfunction within the knock sensor 1 in circuit bank 1. This malfunction will be detected by the ECU when it does not receive the proper information from the knock sensor. This triggers a Check Engine Light to be illuminated on the dashboard.

What causes the P0325 code?

  • A failed ECU
  • A failed knock sensor
  • Open or short in the wiring harness
  • Electrical connection issues

What are the symptoms of the P0325 code?

  • The Check Engine Light illuminating on is normally the most noticeable symptom.
  • The engine may have a slight lack of power.
  • There may be no felt symptoms with P0325.

How does a mechanic diagnose the P0325 code?

  • Uses a scan tool to check for any codes, there may be history, pending and current codes

  • Notes the freeze frame data for each of these codes this will show the conditions the vehicle was under when the code was set such as engine RPM, coolant temp, run time, and vehicle speed

  • Clears the code to have a fresh start to diagnosis

  • Performs a road test to try to get the Check Engine Light to come back on and confirm the issue is present

  • Uses a scan tool to check for proper knock sensor operation while the engine is revved

  • Checks the resistance of the knock sensor

  • Tests the ECU test following the manufacturer's testing procedures if needed.

Common mistakes when diagnosing the P0325 code

With any code, even the most experienced technician can make simple mistakes and overlook the basics if they do not follow all of the diagnostic steps or do not complete them in order.

How serious is the P0325 code?

P0325 is generally not a serious code and should be able to be driven without issue to a safe location once the malfunction occurs. Some vehicles may experience a slight lack of engine power as the ECU will retard timing to prevent damage in case the engine was knocking.

What repairs can fix the P0325 code?

  • Replacing the ECU
  • Repairing or replacing the wiring harness
  • Replacing a faulty knock sensor
  • Repairing an electrical connection

Additional comments for consideration regarding the P0325 code

A scan tool that does more than just check codes will be needed for performing accurate diagnosis of P0325. Many of the items that are checked can be done much faster and more accurately with the live data stream these scan tools allow access to.

Need help with a P0325 code?

YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle. Get a quote and book an appointment online or speak to a service advisor at 1-800-701-6230.

Check Engine Light
P0325
trouble codes

No more waiting rooms! Our mechanics will come to you to diagnose and fix the P0325 code.

SCHEDULE P0325 DIAGNOSTIC
Get a $50 credit for the follow-up repair

Recent Check Engine Light is on Inspection reviews

Excellent Rating

(8600)

Rating Summary
8017
273
65
46
199
8017
273
65
46
199
 at YourMechanic

Brandon

9 years of experience
133 reviews
Brandon
9 years of experience
Ford Escort L4-2.0L - Check Engine Light is on - Nashville, Tennessee
Brandon showed up ahead of schedule, was very personable and diagnosed my problems. He also scheduled my next appointments which will be with him.
 at YourMechanic

William

23 years of experience
33 reviews
William
23 years of experience
Lexus IS250 V6-2.5L - Check Engine Light is on - Mableton, Georgia
Arrived early which was great. William was courteous, and attentive to the issue. Even though it took several attempts I'm so happy he was determined to fix it and he did!
 at YourMechanic

Dan

40 years of experience
1080 reviews
Dan
40 years of experience
Plymouth Grand Voyager - Check Engine Light is on - Lawrenceville, Georgia
Mr. Dan Barber was quite patient, courteous and quite knowledgeable. From my observation, Mr. Barber appears to be quite professional.
 at YourMechanic

Christopher

9 years of experience
120 reviews
Christopher
9 years of experience
Ford Fiesta L4-1.6L - Check Engine Light is on - Smyrna, Georgia
Chris communicated with us each step of the way up until his arrival. He listened well, was knowledgeable, and was prepared. He took the time to diagnose the problem, explained the what, why and how and provided a solution. I would definitely recommend him and will use him again.


Related questions

Engine code P0325.
Hello, p0325 is a code for a Knock Sensor Circuit Malfunction. There is either a sensor fault or the wiring for the sensor to the engine control unit is shorted or has an open circuit. The first thing to check...
What does trouble code P0325 mean?
Hi there - P0325 (https://www.yourmechanic.com/article/p0325-obd-ii-trouble-code-knock-sensor-malfunction-sensor-1-bank-1-by-spencer-clayton) is a Knock Sensor Malfunction. Knock sensors provide a significant function in a modern engine. A failure of the engine knock sensor is a somewhat risky issue. Modern engine have fairly high compression ratios, all...
My car keeps showing safety mode, when the rpm crosses 6000 the cars power reduces and wont move.
The gap between the 6K and the 7K line is considered the red zone. This zone is marked as the over-revving speed for the engine as the valves cannot shut any faster and the timing chain creates too much slack...

More related articles

P0297 OBD-II Trouble Code: Vehicle Overspeed Condition
P0297 P0297 code definition The P0297 code indicates that the car has been driven beyond the maximum speed to which it has been calibrated. What the P0297 code means The P0297 code means that the car has been operated at...
P0418 OBD-II Trouble Code: Secondary Air Injection System Relay A circuit Malfunction
P0418 indicates that a problem has occurred in the secondary air injection system which causes engine hesitation when accelerating and stalling.
P0571 OBD-II Trouble Code: Cruise Control/Brake Switch A Circuit Malfunction
P0571 means there is a problem with the switch that that deactivates the cruise control system which causes the cruise control to not function.

How can we help?

Our service team is available 7 days a week, Monday - Friday from 6 AM to 5 PM PST, Saturday - Sunday 7 AM - 4 PM PST.

1 (855) 347-2779 · hi@yourmechanic.com