Gives codes P0304 and P0326

FIREHAWK523

MEMBER
2012 HYUNDAI ACCENT
4 CYL
2WD
AUTOMATIC
146,000 MILES

Hi, I was wondering if my car giving off those two codes combined narrowed down the issue or should I treat them as 2 separate problems and repair them individually? P0326 is knock sensor and P0304 is cylinder 4 misfire. I just purchased this car from a dealership that had gotten it from an auction.

1 Reply

ASEMASTER6371

MECHANIC
52,797 POSTS

Good morning,

The 326 is for the knock sensor. There is not much in diagnostics for this as they tell you to replace it and see if it goes away.

Does the engine make any noise such as valve taps? The sensor will pick up engine noises and react to it.

To tell if the sensor is working, you need a scan tool that can read live data and when you see the knock sensor, take a small hammer and tap on top the motor and see if the reading changes. That is how I test the sensor to see if it is working.

Roy

Engine Control
P0326 Knock Sensor 1 Circuit Range/Performance (Bank 1) - Inspection/Repair:_:Component Inspection

Component Inspection

Check Knock sensor
1. Substitute with a known - good Knock sensor and check for proper operation.
2. Is the signal normal?

Removal

1. Turn the ignition switch OFF and disconnect the battery negative (-) cable.
2. Remove the intake manifold.
3. Disconnect the injector connector (A).
4. Remove the installation bolt (B), and then remove the sensor from the cylinder block.

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Installation

CAUTION:
Install the component with the specified torques.
Note that internal damage may occur when the component is dropped. If the component has been dropped, inspect before installing.

1. Installation is reverse of removal.

Knock sensor installation bolt:
18.6 - 24.5 N.M (1.9 - 2.5 kgf.M, 13.7 - 18.1 lb-ft)

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