Citroen Axel lambda sensor replacement, made easy

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Our expert insights into lambda sensor replacement

What does a lambda sensor do?

In simple terms, a lambda sensor measures the amount of oxygen in your exhaust fumes, to ensure your engine is burning fuel correctly. They are fitted in both petrol and diesel vehicles.

What are the symptoms of a malfunctioning lambda sensor?

Below are the top three symptoms that could indicate you need to replace your lambda sensor:

  • Your engine performance will suffer—often misfiring, cutting out or not starting at all

  • When your engine is idling, or just ticking over, it will feel rough and lumpy compared to normal

  • Fuel consumption is higher than normal

What happens when we do a lambda sensor replacement on your car?

Our certified mechanics will:

  • Read the ECU for possible fault codes related to the lambda sensor.

  • They will inspect the sensor and ancillaries (like the electrical connectors).

  • If necessary, the mechanic will replace the lambda sensor.

  • The mechanic will advise if other components need to be replaced as well.

  • They will check the sensors again.

  • The mechanic will test drive the car, and make any final adjustments.

Daniel, from LondonDaniel, from London

Hey Fixter, what are the signs of a bad lambda sensor?

If your lambda sensor is failing, your engine performance will suffer, often misfiring, cutting out or not starting at all. You may also experience higher fuel consumption and a rough engine idle.

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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.

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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!).

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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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Want to learn more about Citroen Axel lambda sensor replacement?

What does a lambda sensor do?

Lambda sensors measure the amount of oxygen in the exhaust fumes emitted from your vehicle, to ensure your engine is burning fuel correctly. Fitted in both petrol and diesel vehicles, they help to reduce the number of harmful emissions, primarily gases such as carbon monoxide, and pollutants, produced by your car.

The sensors are designed to work within government exhaust gas legislation. Due to the role they play in the operation of your car, they are also widely known as oxygen sensors or O2 sensors.

Your lambda sensor converts the amount of oxygen present in your exhaust into an electric signal and sends the signal to the computer that controls your engine operation. The ECU (engine control unit) processes the readings and sends the information back to the engine. The engine then makes compensations of how to mix fuel and air to get the ratio back to where it needs to be.

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.

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 lambda sensor need replacing?

Several things can affect your sensor's lifespan, but typically you should replace your lambda sensor every 50k-100k miles. Your sensor should be checked periodically, to ensure its correct operation.

Due to the nature of their operation and their position in an extremely hot and dirty environment, the lambda sensor will wear out over time. In addition, vibrations or damage to connectors and/or wires can also cause failure. Another common cause of premature failure is contamination, which will most likely require a replacement sensor to be fitted.

The law, vehicle regulations and your MOT

A faulty lambda sensor is often flagged up during an MOT test. The current MOT test includes an emissions check, so any unusual emission results will be reported, and an advisory will be given on what work needs to be done.

Remember, it is advisable to check the sensor regularly, to ensure it functions well. It could save your car from failing an MOT, and improve your car’s fuel consumption, saving you money down the line.

What causes a lambda sensor to break?

Due to the nature of their operation and their position in an extremely hot and dirty environment, your lambda sensor will wear out over time. Damage to the heater element of the sensor is the most frequent fault associated with lambda sensors. In addition, vibrations or damage to connectors and/or wires can also cause failure. Another common cause of premature failure is contamination from debris, dust and carbon.

When should a lambda sensor be replaced?

Several things can affect your sensor's lifespan, but typically, it should last anywhere between 50k and 100k miles.

In the past sensors didn’t have a heating element, so required the exhaust temperature to reach a specific heat to operate. Nowadays modern sensors are fitted with a heating element, taking a lot of the pressure off the sensor. These newer sensors have a much longer lifespan.

Your sensor should be checked periodically, to ensure its correct operation.

What are the signs of a bad lambda sensor?

Usually, there a few signs you can look for:

  • Your engine performance will suffer—often misfiring, cutting out or not starting at all

  • When your engine is idling, or just ticking over, it will feel rough and lumpy compared to normal

  • Fuel consumption is higher than normal

  • Your car has failed an emission test

  • The engine warning light will illuminate on your dashboard

What happens during a lambda sensor replacement?

During the repair our certified mechanics will:

  • Read the ECU for possible fault codes related to the lambda sensor.

  • They will inspect the sensor and ancillaries (like the electrical connectors).

  • If necessary, the mechanic will replace the lambda sensor.

  • The mechanic will advise if other components need to be replaced as well.

  • They will check the sensors again.

  • The mechanic will test drive the car, and make any final adjustments.

What is the average life of a lambda sensor?

Several things can affect the lifespan of your lambda sensor, but typically, it should last anywhere between 50k and 100k miles. The sensor may have to be replaced sooner if it becomes damaged or corroded.

Can you drive with a broken lambda sensor?

Technically you can drive with a faulty lambda sensor, however we don’t recommend it. You'll want to change it as soon as possible, because otherwise, you'll be spending more money on fuel and you risk having to splash out on a new catalytic converter as well.

What happens if you don't change the lambda sensor?

A broken or faulty lambda sensor will lead to the ECU not being able to regulate the fuel / air mixture correctly which can result in the engine running lean or rich. In turn the car will likely have poor fuel consumption, it might also cause the car to fail an emissions test.

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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