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Our expert insights into knock sensor replacement
What does a knock sensor do?
The knock sensor is bolted directly onto the outside of the engine block and is used to detect vibrations and detonation “knock” noises from the engine to prevent engine damage.
What are the symptoms of a bad knock sensor?
Below are the top three symptoms that could indicate you need to replace your knock sensor:
Engine pre-detonation known as “pinking” or knocking
Reduced engine power
Increased fuel consumption
What happens when we do a knock sensor replacement on your car?
Our certified mechanics will:
Perform a diagnostic check to discover any fault codes coming from the knock sensor and other related parts of the engine.
Once they confirm that the knock sensor is faulty, they will fit a replacement knock sensor.
Once replaced, the mechanic will start the engine and recheck for fault codes.
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A fully-insured Fixter driver will pick up your car, whenever and wherever works for you. (If you’d prefer to drive your car to the garage yourself, that’s not a problem!).
Our in-house experts will keep you updated, and your card is only charged once all work has been satisfactorily completed and approved by our team. Your driver will then drop the car back when it’s convenient for you.
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What does a knock sensor do?
The knock sensor is located on the outside of the engine block. Its job is to record knocking noise from the engine in order to prevent engine damage.
The knock sensor "listens out for" vibrations from the engine block and converts these into electrical signals. The signals are filtered and evaluated in the engine’s control unit. If the vibrations are determined to be outside of the predefined ‘normal’ limits, the engine management control unit will alter the ignition timing until it returns to within the correct limits.
Seat
Seat S.A. is a Spanish automobile manufacturer, founded over 65 years ago in 1950.
In 1986, the German Volkswagen Group bought Seat from the Spanish government to become the owner and operator of this established marque.
How popular is Seat in the United Kingdom?
Since the VW takeover, the number of Seat cars on the roads in the UK has grown steadily to over 500k.
Marketing similar cars to different markets
Although the structure and engineering behind all of the Volkswagen Group’s cars are closely related, based on very similar systems and practices, VW has aimed Seat at a market that offers something a bit different to Audi and VW.
Seat: Affordable, youthful versions of established models
Given that the brands under the VW umbrella (not forgetting Skoda too) all carry similar architecture, what sets the Seat models apart from their counterparts is their character, price-point and their ability to deliver slightly sportier handling due to their tuning. When you think of Seat, you think fun. VW: solid. Skoda: value. And Audi is for the executive.
So despite all being very similar machines under the hood, VW has created each of them to sit in quite different marketplaces. The Leon, for example, will appeal to a different type of driver to the Octavia or the Golf (and the Audi A3) despite being almost the same car. The same goes for the Ibiza, the Arona and the rest of the models in the Seat range.
How often should a knock sensor need replacing?
Replacing a knock sensor is not part of routine car maintenance so should only need to be fixed when it breaks or begins to fail. On most modern vehicles, the knock sensor should last over 150,000 miles or the lifetime of the vehicle.
The law, vehicle regulations and your MOT
A fault with the knock sensor will often illuminate the Engine Management Light in your car. Your vehicle will fail its MOT if your Engine Management Light remains on when the engine has been started. Under the new MOT rules, it is now classed as a major fault so will need to be fixed before a mechanic can pass your car. Therefore it’s crucial that you keep an eye out for engine warning lights and have your car inspected by one of our vetted mechanics when necessary.
What happens when we do a knock sensor replacement on your car?
Our certified mechanics will:
Perform a diagnostic check to discover any fault codes coming from the knock sensor and other related parts of the engine.
Once they confirm that the knock sensor is faulty, they will fit a replacement knock sensor.
Once replaced, the mechanic will start the engine and recheck for fault codes.
When should a knock sensor be replaced?
You should have your knock sensor looked at as soon as you notice any of the related symptoms, such as an illuminated engine warning light, reduced engine power or poor fuel economy. Because your knock sensor plays a vital role in preventing engine damage and in the safe and efficient running of your car, it’s very important to have it fixed as soon as possible.
What are the signs of a bad knock sensor?
Usually, there a few signs you can look for:
Engine pre-detonation known as “pinking” or knocking
Engine warning light comes on
Reduced engine power
Increased fuel consumption
How often should you replace your knock sensor?
Replacing a knock sensor is not part of routine car maintenance so should only need to be fixed when it breaks or begins to fail. On most modern vehicles, the knock sensor should last over 150,000 miles or the lifetime of the vehicle.
What happens during a knock sensor replacement?
During the repair our certified mechanics will:
Perform a diagnostic check to discover any fault codes coming from the knock sensor and other related parts of the engine.
Once they confirm that the knock sensor is faulty, they will fit a replacement knock sensor.
Once replaced, the mechanic will start the engine and recheck for fault codes.
What is the average life of a knock sensor?
On most modern vehicles, the knock sensor should last over 150,000 miles or the lifetime of the vehicle.
Can you drive with a broken knock sensor?
You should not drive with a bad knock sensor. If you continue to drive with a failing sensor, serious damage could be done to your engine, causing an expensive repair or replacement. As well as this a bad knock sensor will greatly reduce your cars power and fuel economy. To save yourself time and money down the line we recommend refraining from driving and getting the issue fixed as soon as possible.
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