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.

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.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. Knock sensor keeps setting off

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Q: Valve cover leaking on to exhaust manifold gasket can that make it blow white smoke and make CEL flash

You may have piston rings leaking compression into the crankcase causing the problem and will need to have a compression and pressure test to the cylinders to see what is leaking.

Q: My horn switch is not working would like to change to push button instead and need help locating the wire in the steering column.

I would recommend consulting a wiring diagram for this particular modification. Wiring diagrams are available in Chilton or Haynes service manuals. You can pick up one of these books at all of your local auto parts stores for the particular...

Q: Check Engine Light on - 2007 Mazda CX-7

Hi there. When the Check Engine Light comes on, it will store a trouble/fault code in the engine control unit. It will remain on as long as the ECU continues to see the fault that turns it on. If it...

Related articles

How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...