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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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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.
Citroën
Citroën is a French automobile manufacturer, part of the PSA Peugeot Citroën Group since 1976, established over 100 years ago in March 1919.
Citroën produced the world’s first mass-produced front-wheel drive car and one of the first to feature a unitary type body, with no chassis supporting its mechanical components.
How popular is Citroën in the United Kingdom?
Citroën is probably better known for its quirky design and fun fashion styled brand of cars. Offering something different from more traditional sporty looks, they are a brand that provides value without being cheap.
There were 1.3m Citroën cars on the roads at the close of 2018; a figure that peaked in the early part of 2015 and has maintained a very similar number ever since.
Good value vehicles for family driving
Citroën offers a range of fun-looking smaller city cars and family cars for every ilk. The smallest starts with their C1 city model, growing into the C3 mini-MPV and SUV models, then the C4 subcompact and compact featuring crossover and SUV styles, up to the C5 family saloon, that is also available as an SUV sporting Citroën’s Aircross moniker. With models featuring up to 7 seats, Citroën doesn’t just create cars for everyday family motoring—they supply cars for the biggest of families.
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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