P0328

Knock Sensor 1 Circuit High (Bank 1 or Single Sensor)

Car Fault Codes Ignition & misfire

Can you still drive? With care, short trips only

Who can fix it? Needs a workshop

Typical repair time 30 minutes – 4 hours

Typical cost SAR 100 to 900

What it means

The signal from knock sensor 1 on bank 1 is higher than the engine computer expects. The cause may be a short to a voltage source, interference in the wiring, or strong mechanical engine noise that produces a large signal.

Symptoms4

Check engine light on.
Reduced performance from retarded ignition timing.
Pinging or mechanical noise from the engine in some cases.
Higher fuel consumption.

Possible causes6

Signal wire shorted to a powered wire through damaged insulation.
Electrical interference from nearby ignition wires or a damaged wiring shield.
Strong mechanical engine noise, such as a loose part, valve noise or timing chain noise.
Real detonation from low-octane fuel or carbon deposits.
Failed sensor.
Engine computer fault (rare).

How to diagnose5

Listen to the engine for mechanical noise or pinging under load.
Inspect the wiring for damaged insulation touching other wires, and check the shield if fitted.
Unplug the sensor and watch whether the code or reading changes, to separate a sensor fault from a wiring fault.
Measure sensor resistance and check for unexpected voltage on the signal wire per the manufacturer specification.
Confirm the fuel grade and that the engine is not overheating.

How to fix5

Repair damaged wiring or insulation and route it away from ignition wires.
Use the recommended octane fuel.
Repair the source of mechanical noise if found.
Replace the knock sensor if it is proven faulty.
Clear the codes, drive under moderate load and confirm the code does not return.

Repair cost

0–500

500–2,000

2,000–5,000

5,000+

In Saudi riyals; the highlighted part is the expected range for this fault.

The cost is low for a wire or fuel grade issue and rises with a new sensor; repairing internal mechanical noise needs a separate estimate.

Prices are rough estimates for common cars at independent workshops and vary with the car and the source of the part.
Prices last updated: September 2026

Frequently asked questions

Does this code mean the engine is really knocking?

It may, if there is mechanical noise or detonation, but the more common cause is an electrical fault in the wiring, and testing tells them apart.

Why drive with caution?

If the engine is truly knocking, heavy load can make it worse and damage the pistons, so avoid hard acceleration and heavy loads until it is checked.

This guide is for information only and does not replace an inspection by a qualified technician. If the fault involves brakes, steering, engine temperature, electrics or refrigerant, do not attempt the repair yourself.

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