Audi Q2 knock sensor replacement, made easy

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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.

Daniel, from LondonDaniel, from London

Hey Fixter, what causes a knock sensor to break?

Knock sensors can fail due to incorrect mounting, corrosion, breaks in wiring or mechanical damage. Knock sensors are quite fragile, therefore you should take proper care of it to maintain its life for longer.

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How fixter works

How Fixter works

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First accordion item imageBook now, pay later

Upfront, fair pricing, with free collection & return and no hidden costs. Our in-house experts will then choose the ideal garage to work on your car.

Accordion item 2 imageWe drive your car to the best garage

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!).

Accordion item 3 imageWe return your car the same day

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.

Our reviews

Takes a lot of stress away

I would definitely recommend this company: knowing someone was keeping an eye on everything to make sure I wasn't being overcharged for parts and labour takes a lot of stress out of having the work done. I felt really well looked after. Thank you Fixter.

Kathleen Hodge, West Yorkshire

Excellent service

Excellent service. On time to pick up my car & drop it back. Full service cost £179, main dealer quoted me £700-lots different!

Muhammad, Birmingham

Total game-changer!

Just had my MOT done through Fixter for the first time. It took about 5 minutes of my time in total to book, hand over the key, and get it back when the car was returned. So I was able to carry on looking after my 2 year old. Total game-changer!

Oliver Woodford, London

No need to drive to a garage

Can't get more convenient than someone turning up, taking the car from the house for its MOT and returning it a few hours later. No having to drive to a garage (often miles from anywhere or in the middle of an industrial estate) or hanging around waiting.

Darren, Pontefract

I literally cannot fault them

This is the 3rd time I have used Fixter and I recommend to everyone. It makes getting an MOT super easy for me. Everyone I speak to on the phone is incredibly helpful and polite, and they seem to be the most cost effective. I literally cannot fault them.

Julia M, Bristol

Want to learn more about Audi Q2 knock sensor replacement?

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.

Audi

Audi AG is a German automobile manufacturer, established over 100 years ago in April 1910, and has been owned by the Volkswagen Group since the 1960s.

This marque design and engineer luxury vehicles and distributes them worldwide. In the UK alone, there were over 1.7m Audi vehicles on the roads in the final quarter of 2018; a number that is continually growing year after year, and has more than doubled in the past decade.

Audi’s success can be attributed to its ability to move with the times, retaining its reputation as a prestige manufacturer and as part of the ‘big 3’ German marques responsible for high sales throughout the world market, alongside Mercedes and BMW.

Luxury executive vehicles for every type of driver

Audi’s current range features predominantly luxury executive and family cars of varying sizes: with compact to full-size saloons, coupés and sportback models, complemented by a growing range of SUV and sports car models.

Vorsprung durch Technik

The Audi brand is easily recognisable by their 4-ring logo—originally representing the four car companies to create Audi’s predecessor company, Auto Union—and their world famous slogan that ran for over 30 years, translated as ‘Being ahead through technology’. Despite no longer being used in their mainstream marketing, the meaning behind it still stands true of the brand today.

Audi: A sensation in rallying motorsport

Throughout the 1980s the Audi Quattro was famous for dominating rallying worldwide. The introduction of their four-wheel drive turbocharged model went on to win the World Rally Championships in both 1983 and 1984 and amassed a number of podium finishes and titles throughout the decade, all across the globe.

Audi’s reliability and reputation

Audi ranked 20th place out of 30 car brands in the What Car? Reliability Survey in 2018. Audi’s reputation for creating reliable running vehicles has steadily improved over time to become a strong contender to some of the Asian brands that have continued to dominate in this area.

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.

Common questions about booking at Fixter

Common questions about booking at Fixter

Who is going to drive my car?

All of our drivers are fully insured and your vehicle is always protected.

We put our drivers through rigorous vetting and training before they are able to drive your vehicle. All of our drivers must have at least 3 years of driving experience, hold a clean driver's licence, be over the age of 21, capable of driving both manual and automatic vehicles and pass a criminal background check.

Your vehicle will be assigned to a driver who is responsible for collecting it from your home, delivering it to the garage and returning your vehicle once all work is completed.

Sometimes we might coordinate with a garage for them to send their own driver to collect your vehicle. In this instance, you are protected as you would be if it was a Fixter driver. 

What garage will my car go to?

One of our in-house mechanics will factor in the make and model of your car, as well as the work that needs doing. They will then allocate your booking to the most appropriate Fixter garage in your area, and we’ll email you to confirm.

Here’s why only 1 in 20 garages pass our selection criteria:

  • We only choose garages registered as a Limited Company, with a minimum of 3 years of trading.

  • We assess each garage's various established affiliations (e.g. Bosch / Unipart / Garage).

  • We perform an online audit: Fixter only selects garages with at least a 4 star customer rating.

  • We make sure to visit each garage in person. Our in-house mechanics evaluate the quality of equipment, staff qualifications, capacity, and technical capabilities of selected servicing centres. Fixter only works with garages which strictly use manufacturer-equivalent parts.

  • After all requirements are fulfilled, we negotiate preferential terms with each selected (including parts, labour, oil, and MOT test rates), so we can pass it along to our customers.

What parts will be used?

All parts used in repairs and services carried out by Fixter are either manufacturer parts or equivalent. This guarantees that only the best quality parts are used in your vehicle. We offer a 12-month warranty, meaning that should anything should go wrong with the parts or labour we’ll take care of it, free of charge. 

How and when do I pay?

We take your card details when you book online, but nothing is charged to your card until all the work has been approved by our in-house experts, and satisfactorily completed.

No extra work will be carried out without your consent. If additional work is required, one of our in-house experts will call you to walk through any diagnostic reports, recommendations or additional quotes from the mechanic working on your car. We check every quote to make sure the work is required and has been fairly priced.

Note: If you need to update your payment details to pay for your booking, the team will send you a secure link to add the new card details.

How does the money back guarantee work?

If your car fails its MOT at one of our garages, but you believe that your car should have passed, you'll have the option to take your car to another garage to do a new MOT test. If your vehicle passes the MOT at another garage, we’ll refund you for the original MOT test that you carried out with us. Collection and delivery fees are non-refundable.

How does the Fixter 12-month warranty work?

All Fixter bookings are covered by a 12-month warranty on parts and labour.

If there’s a problem (with either parts or labour) up to 12 months after your booking date, we’ll sort it out for you, completely free of charge.

Just email support@fixter.co.uk or call our team on 0330 808 9527 and we’ll take care of it.

Note: this doesn't apply to an air con regas as leaks can occur at any time.

Can I cancel my booking?

We understand that things change.

If you need to cancel or change your booking, please let us know asap. Our agents spend time finding you a top-rated garage, which is then booked to take care of your vehicle. In many cases, parts are ordered in advance. As a result, we operate a 72-hour cancellation policy. If you have a confirmed booking with us and need to cancel within 72 hours of the appointment, a cancellation fee of £20 may be applied.

We want to avoid that so our agents will work with you to try and find a new appointment instead. To discuss changing or cancelling a booking, please email or phone on 0330 808 9527.

Our team works Monday to Friday from 8:30 am to 5:30 pm.

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