Q: Knock sensor keeps setting off

asked by on

So I've have been driving my Mazda as a daily driver for a while now. Just the other day I got my check engine light and I hooked up my code reader. I got the code P0328 (knock sensor) and I'm not sure what would set that off. I'm running ethenal free fuel, the car seems to be running fine and doesn't have any unusual noises. Just wondering what I should start doing next.

My car has 141000 miles.
My car has an automatic transmission.

A: I would recommend <a href='https://www.your...

I would recommend clearing the P0328 code and then see if the code returns. If the code returns and the engine does not have any knocking noise, then test and replace the knock sensor and retest the system. If the code returns, then have a follow up check done to see if the knock sensor is detecting a knock that is hard to hear without a specialized listening device; the engine may be having an internal knock setting off the knock code so the Check Engine Light would need to be diagnosed.

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Save up to 30%

Get a quote

What others are asking

Q: Battery light is on, car won't start

Hi, thanks for writing in. I'd be happy to help. This is a common issue when the starter relay is failing. This is a unit that directs power from the battery to the starter. When this is failing, this will...

Q: Dashboard is working partially

Hey there. It sounds like it is having serious wiring issues. It is quite possible that one or more wires shorted. This is a potentially dangerous situation, and should be inspected immediately before getting back on the road. If you...

Q: DPF light, traction and engine lights flashing, car has no pulling power, dense blue/black smoke on each start.

Based on the information you provided, it is possible that a failed seal in the turbo is allowing engine oil into the intake. The result would be increases carbon buildup on your DPF (Diesel Particulate Filter). Usually a flashing Check...

Related articles

How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.