2004 BMW 330Ci Knock Sensor Replacement Cost
The average cost for a 2004 BMW 330Ci Knock Sensor Replacement is between $645 and $942.
- Labor costs are estimated between $488 and $716 while parts are priced between $157 and $226.
- This range does not include taxes and fees, and does not factor in your unique location. Related repairs may also be needed.
- For a more accurate estimate based on your location, use our Fair Price Estimator below.
Knock Sensor Replacement
What is a knock sensor?
The engine knock sensor alerts the driver that knocking has been detected inside the engine.
How does the knock sensor work?
Every time the engine knock sensor notices a vibration, it sends a signal to the engine's computer, reporting how large it was. The engine's computer is programmed to expect a specified range of signals from the knock sensor.
Most information from the knock sensor will be bumps in the road or closing the car door. However, when a vibration is large enough, the knock sensor signal will trigger the computer to alert the driver. This is a protective measure meant to prevent complete engine failure.
What are the symptoms related to a bad knock sensor?
When the knock sensor sends a warning signal to the vehicle's computer, the computer will usually reduce power output and illuminate the check engine light. Some vehicles will not restart until the problem has been fixed.
» MORE: How to tell if you have a bad knock sensor
Can I drive with a knock sensor problem?
No. When the knock sensor sends a warning to the computer, it is always treated as if there is an internal engine failure. The vehicle should not be started or driven until the knock sensor is diagnosed as faulty, or the issue is repaired.
How often do knock sensors need to be replaced?
On most vehicles, the knock sensor is tough enough to last over 150,000 miles.
How are knock sensor issues diagnosed?
The check engine light and knock sensor-related OBD codes will immediately point a technician to the knock sensor. The technician will first conduct a visual inspection of the sensor and associated wiring.
If the knock sensor wiring harness and electrical connectors are working properly, the technician will test the knock sensor. Further bench testing may be done. After testing is complete, the part will be replaced and the car tested to make sure the problem is resolved.
How is a knock sensor replaced?
If the knock sensor is faulty, the technician will unscrew the bad sensor and install a new one. There is normally only one electrical connector per knock sensor, and there may be more than one knock sensor on the engine.
Can I replace the knock sensor myself?
Most people can replace a knock sensor, and very few basic tools are needed — but diagnostics can be tricky. It's vital that the sensor is diagnosed correctly.
If diagnosing the switch proves difficult or impossible, the best idea is to contact a professional.
BMW Knock Sensor Replacement Cost Estimates
The average cost for a Knock Sensor Replacement is between $645 and $942 but can vary from car to car.
BMW 330Ci Knock Sensor Replacement Cost by Year
The average cost for a BMW 330Ci Knock Sensor Replacement is between $645 and $942 but can vary from car to car.
