Q: What happens if I don't replace knock sensor?

asked by on

what happens if knock sensor is not replacced

My car has 200000 miles.
My car has an automatic transmission.

The knock sensor on the engine is there to detect for an engine noise from pre ignition (pining) normally. This is so the computer can advance the ignition timing to the maximum it can without the engine pinging. This gives you the best engine power and fuel mileage.

If the knock sensor is not working then the engine could start pinging without the computer being able to detect it. This pinging can cause the combustion process to burn or blow holes in the pistons.

If an engine has an internal engine noise from a rod or piston knock problem it can cause a knock sensor to keep detecting a knock and the computer will keep reducing the ignition timing until a set limit is met and the computer will set a code for the knock sensor. Have the engine checked for internal problems that could be causing the knock sensor code.

If the knock sensor is bad through testing then if it is not replaced the engine may have reduced power, loss of fuel mileage, and hesitations. If you need help the replacement of the sensor or need to resolve any of these conditions, consider YourMechanic, as one of our mobile technicians can come to your location to diagnose and service your vehicle.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1,000 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!
  1. Home
  2. Questions
  3. What happens if I don't replace knock sensor?

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: Car problems

It will depend on why you had the engine rebuilt? If you had the engine rebuilt due to overheating and coolant came out of your exhaust then you may have damaged the catalyst during this period by sending hot coolant...

Q: Power lock not working properly.

I found multiple reports of this problem on the ES series - the connecting clips that connects the latch bar to the inside and outside handles break under the repeated force of pulling the door open/closed. There is no real...

Q: If tdc is on exhaust stroke will it have 10psi on cylinder 1

Most engines will need at least a minimum of 100 psi per cylinder in order to run. In addition, for the motor to run efficiently, this also requires a variance of less than 10% from cylinder to cylinder on this...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
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...
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...