Engine replacement cost: removal and installation, new or used
Installing a new engine is a major decision, and most car owners have to decide between replacing the motor or the car itself. This guide explores the costs of an engine removal and installation, as well as whether to choose a new or used engine. It breaks down factors affecting pricing, pros and cons, and how to make the best choice.
What kind of engine does my car have?
The usual method of finding out exactly what engine you have is by looking up the vehicle identification number (VIN). This is a unique 17-character code consisting of letters and numbers. It can normally be found on a stamp in the left-hand corner below the windscreen, in the engine bay, or stamped on the vehicle’s chassis.
To decipher the code, you will need to enter it into the manufacturer’s site or another reliable website. The characters 4 to 8 of the code are the engine code for your specific vehicle model. Alternatively, you can search through your car owner’s manual. You should be able to find out about the type of motor including its size and output. Knowing this information can help you find car engine parts that are 100% compatible.
What causes an engine replacement?
Common reasons for an engine replacement:
- Damage caused by a collision: an accident at the front of the vehicle can cause irreparable damage to the engine unit and radiator. The insurance company may offer to cover the costs of a replacement.
- A faulty engine block: the block houses all the cylinders and major combustion components, exposing it to extremely high temperatures, pressures, and vibrations. Over time, it can become worn and crack, leading to coolant leaks and structural faults.
- Ageing/high mileage: nothing lasts forever, including your hardworking engine. Eventually more and more parts start to break down until it becomes a choice between installing a new motor or getting a new car.
- Thermal damage/detonation: excessive overheating or abnormal combustion, including misfiring, can cause havoc in the power unit. The excessive heat and pressure can cause parts to melt and sensors to fail leading to serious issues.
- Metal parts in the motor oil: these metal shavings are a key indicator of serious wear and can prevent the engine from being properly shielded by the lubricant. This inevitably leads to costly damage if left untreated.
Engine replacement cost: new or used
Nowadays, a full engine replacement typically costs anywhere between £1,500 and £10,000 depending largely on the make and model of the vehicle, the availability of parts, and the labour costs.
The differences between the prices of new and used engines can be huge. For example, used engines do not normally cost more than £3,000 and can be priced as low as £500 depending on the age, condition, and mileage.
Car Model |
Estimated Replacement Cost (GBP) |
Land Rover Discovery 4 |
~£6,000-£8,000 |
Ford Fiesta |
~£1,800-£2,500 |
Vauxhall Corsa |
~£1,500-£2,200 |
Ford Transit |
~£4,000-£6,000 |
BMW 1 Series |
~£6,500-£8,500 |
Nissan Qashqai |
~£3,500-£5,500 |
Peugeot 208 |
~£2,500-£4,000 |
VW Golf |
~£4,500-£6,500 |
How much is a new car engine?
The table below breaks down the average costs of a new engine based on the type of vehicle. Hybrid motors tend to be a tad pricier due to being more modern and often more complex. Disassembly and installation costs may increase the overall amount.
Engine Type |
Average Cost (GBP) |
Petrol |
£2,000-£4,000 |
Diesel |
£3,000-£6,000 |
Hybrid |
£5,000-£10,000 |
How much is a used engine for a car?
Prices for used engines typically range between £500 and £3,000 in the UK. However, this will depend greatly on the vehicle model, year of manufacture, complexity, and engine condition. Diesel engines are usually more expensive than petrol models due to stronger materials, advanced technology, turbocharging, emissions controls, and specialised production for larger vehicles.
For common vehicles, smaller engines (e.g., for compact cars) may be on the lower end, while larger engines (e.g., for trucks or performance vehicles) can be on the higher end. It's also important to consider any additional costs for installation and warranty, which may add to the overall expense.
Labour costs for engine replacement
The average complete engine replacement will take a professional around 10 to 12 hours to perform. You can usually expect to pay at least £250 to £600 in labour. It is definitely worth comparing quotes before you choose a garage/mechanic.
The rates for each mechanic are often influenced by the location of the garage and they can range anywhere between £20 and £80. For example, the rates in London will be usually much higher than those in a smaller town with lower living costs, such as Huddersfield, UK.
The most important steps in an engine replacement
Replacing an engine involves several critical steps to make sure the car is roadworthy:
- Preparation: disconnect the battery and gather necessary tools, equipment, and documentation, such as the vehicle’s repair manual.
- Drain fluids: remove engine oil, coolant, and other fluids to prevent spills during removal.
- Disconnect components: carefully disconnect wiring, hoses, fuel lines, and exhaust connections linked to the engine. label connections for easy reassembly.
- Remove the old engine: use a hoist to lift the engine after unbolting it from the transmission and motor mounts.
- Inspect and prepare: check mounts, transmission, and other parts for damage. clean components and install new gaskets, seals, or supporting parts as needed. Note: it is also worth inspecting the exhaust/SCR system parts, such as the catalytic converter, to the condition and compatibility.
- Install the new engine: secure the engine, reconnect components, and ensure proper alignment with the transmission.
- Refill fluids and test: refill fluids, reconnect the battery, and test the engine to ensure proper functioning before finalising.

How long does it take to replace a car engine?
Most engine replacements take between 10 and 15 hours or at least two working days to complete. This will vary depending on the engine, the mechanic’s experience, the workload, and whether any other issues arise. For standard passenger cars, the process usually falls within the lower end of this range, while performance or luxury vehicles may take longer due to their more intricate designs.
The procedure involves several detailed steps, including removing the old engine, disconnecting all related components (such as the exhaust system, wiring, and cooling systems), inspecting the mounts, and properly fitting the new engine. After installation, the mechanic must also reconnect all components, test for leaks, and make sure that the new engine works fully.
What to do after an engine replacement
After replacing your car’s engine, it’s important to inspect and maintain several components to ensure optimal performance and reliability. Here are the parts you should check or replace:
- Timing belt or chain: make sure the timing system is properly aligned and functioning as it is vital for engine synchronisation.
- O-rings and gaskets for car engine: verify that these seals are intact to prevent leaks in critical systems like oil and coolant lines.
- Seals: inspect crankshaft and camshaft seals for any signs of wear or improper fitting.
- Sensors: confirm that all engine sensors, such as oxygen and temperature sensors, are properly connected and functioning.
- Spark plugs: Clean or install completely new spark plugs to ensure efficient combustion and smooth engine starting.
- Water pump: check the water pump for proper operation to avoid cooling system failures.
- Air filters: replace air filters to ensure clean airflow into the engine.
- Oil filters: install a new oil filter and fill the engine with fresh oil to protect moving parts.
Common problems after an engine replacement
Replacing an engine is a complex process, and several issues can arise if not done properly. Being aware of these common problems can help you identify and address them quickly:
- Leaks: oil, coolant, or fuel leaks may occur if seals, gaskets, or connections are not properly installed or tightened.
- Electrical issues: faulty wiring or disconnected sensors can lead to warning lights, poor performance, or engine misfires.
- Overheating: improper installation of the water pump, thermostat, or radiator connections can cause the engine to overheat.
- Noisy operation: unusual sounds like knocking or ticking could indicate loose components or incorrect timing.
- Check engine light: a recurring light could point to sensor malfunctions or compatibility issues with the new engine.
- Poor performance: sluggish acceleration or power loss may result from incorrect fuel-air mixtures, ignition timing issues, or clogged filters.
- Vibration or rough idling: this could signal improperly mounted engine supports or unbalanced components.
How does a new engine affect the value of a car?
Installing a new engine can positively impact your car’s value, especially if the previous engine was acting up. For older vehicles, a new engine can make the car more reliable and appealing to buyers, potentially increasing its resale value.
However, this also depends on factors like the car's overall condition, make and model, and mileage. In some cases, a new engine may not fully offset the car’s depreciation, especially if it's installed in a vehicle with other significant wear and tear. Providing documentation of the engine replacement can also increase buyer confidence and value perception.
What is the difference between a new engine, a reconditioned engine, and a replacement engine?
A brand new engine is factory-fresh, made to the original specifications, and has never been used. It should offer high reliability, often with a full warranty. New engines are ideal for restoring a vehicle to its original condition, however, they may cost a lot more than refurbished options.
A reconditioned engine is a previously used one that has been disassembled, cleaned, inspected, and rebuilt with new or reconditioned parts. This process restores it to near-new condition at a lower cost. Reconditioned units are tested for performance and often include a limited warranty. They’re a practical choice for addressing significant engine wear or damage.
A replacement engine refers to any motor installed to replace the original, whether new, reconditioned, or used. This includes new and refurbished power units. Upgrading components, like the car turbo, for tuning purposes may also be part of the replacement if you want to enhance performance. Replacements vary widely in price and condition.