Kia

Kia troubleshooting questions? Ask a mechanic

Ask an Expert, Get an Answer ASAP!

Kia Knock Sensor Problems

Do you need to replace the Kia knock sensor? Do you have error codes relating to the Kia knock sensor that need deciphered? When our vehicle malfunctions and we need quick reliable answers, knowing where to get them is key information. Read below where Experts have answered some frequently asked questions about Kia knock sensor issues.  

Where is the Kia knock sensor located and its functions?

Usually, the knock sensor in Kia is situated on the engine block towards the backside beneath the intake manifold. These sensors are mainly used to rectify and improve the fuel delivery in a vehicle by detecting harmful engine vibrations or pinging due to over or under load. 

What could cause a knock sensor code and the check engine light to appear on a Kia Optima?

The most common cause could be a faulty knock sensor. Other possible reasons could be an engine misfire, a leaking EVAP, a failed ECM or its wiring, a faulty EGR valve or a bad vacuum hose. Using a diagnostic scanner, scan the computer to check for error codes so the problem can be fixed. Additionally, smoke test the EVAP system for leaks and replace the knock sensor, if necessary.

How to clear Kia error codes that keep reappearing despite replacing the plugs, wires and the knock sensor?

First, pressure test the cooling system, as there might be some coolant intrusion in the combustion chamber, causing this issue. Then, with the tester connected, try to turn on the vehicle to verify if it misfires. If it does, it could indicate a leak in the cooling system. Contacting an auto shop may be better suited to help aid in a repair like this.

How to remove the knock sensor on a 2003 Kia Spectra?

First, take out the intake manifold support bracket. Then, unplug the wire harness and finally, free off the bolt to remove the sensor. For installation, repeat the entire procedure in the reverse manner.

What can cause a Kia Rio knock sensor error code and a noise in the engine?

A mechanical failure inside the engine can cause this to happen. A faulty timing component or a damaged serpentine belt tensioner could be the cause if the noise comes out from the front side of the engine. However, if it appears to come from under the engine, it could be from a failed connecting rod or a faulty main bearing. Troubleshoot these components to figure out the exact cause of the problem.

What does a blinking check engine light and a faulty Kia knock sensor indicate?

First, check if there is any noise or loss of power from the engine. If so, it could point to an internal engine knock from the use of incorrect gas. If not, it might indicate either a faulty knock sensor or a failed knock sensor circuit.

What could cause a 2005 Kia Rio to display a P0325 code even after replacing the knock sensor?

This could be caused either by an open wire or connector to the knock sensor or a shorted out wire to the ground. To check this, first verify if there is signal from the sensor using a scan tool. If so, try to locate any signal activity to ensure if the wire is fine. If not, use a voltmeter to verify if the wire and its connections are properly secured.

What can cause a P0326 code to appear in Kia?

A faulty knock sensor can cause this code to appear. Have the wiring connections to the sensor tested to ensure if they are causing the problem. If not, replacing the sensor could be the next best repair option.

What can be done if the Kia knock sensor becomes defective?

First, check the electrical connector and the wire harness to the sensor for any signs of cracked, loose or oil soaked wires. If they check out good, use a diagnostic machine to retrieve the error codes. If the codes indicate a faulty sensor, replacing it would be the best option.

What could cause a 2002 Kia Sportage to display a knock sensor performance code?

The problem could either be with a faulty knock sensor or a defective wiring to it. The best course of action would be to have these components properly diagnosed to pinpoint the true fault.

What could be the reason if a 2001 Kia Rio fails to go above 55 mph with a new knock sensor?

Most commonly, it could be due to a faulty front oxygen sensor. Remove the sensor and run the vehicle to see if it fixes the problem. If not, disconnect the mass air flow sensor and test the intake and the PCV valve for vacuum leaks. If this still doesn’t resolve the issue, the problem could either be with the EVAP system or a stuck open purge control solenoid valve.

If you have doubts regarding a Kia knock sensor problem, clarifying it with an Expert could be the best available alternative. This will help you save both time and money from an in-person visit to an auto shop along with offering customized and focused answers to your questions. 

Please type your question in the field below

4 verified Kia Mechanics are online now

Kia Mechanics on JustAnswer are verified through an extensive 8-step process including screening of licenses, certifications, education and/or employment. Learn more

Online
Kiatech

Kia Master Technician

High School or GED

★★★★★
210 positive reviews
Online
Chris (aka- Moose)

Technician

Vocational, Technical or Trade School

★★★★★
728 positive reviews
Online
George H.

ASE Certified Technician

Associate Degree

★★★★★
679 positive reviews
See all Kia Mechanics