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Suzuki K15B Engine - Replacement Cost, Problems & CompatibilityProblems & Compatibility
The 1.5-litre naturally aspirated "Dualjet" petrol engine fitted to the modern Suzuki Vitara and SX4 S-Cross. Reconditioned units start from £1,500 .
Supply & Fit Available
12-Month Warranty
Nationwide Delivery
100+ Suppliers
Used from
£800
Reconditioned from
£1,500
Rebuilt from
£2,500
GB
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Quotes only from vetted UK engine specialists.
Key Specs
Suzuki K15B - Specifications at a Glance
Engine Code
K15B
Fuel
Petrol
Configuration
1.5L inline-4, Dualjet (dual injectors per cylinder), VVT
Power Output(s)
112-115 hp (depending on tune and model)
Years Produced
2017-Present
UK Models Fitted
2 Suzuki models - full list in Compatibility below
Replaced
M15A
Replaced By
K15C (Mild-Hybrid variant)
Most Common Failure
Water pump seal weeping and ignition coil pack degradation
Reconditioned Price Range
£1,500-£2,500 supply-only
Vetted UK specialists for K15B replacements
Minimum 12-month warranty on reconditioned and rebuilt options
Fitted To
Which Suzuki Models Use the K15B-
TAG: Fitted To
| Model | Generation/Chassis | Badge(s) | Years | Link |
|---|---|---|---|---|
 Suzuki Vitara | LY (Facelift) | 1.5 SZ-T, SZ5 | 2018-Present | |
| Suzuki SX4 S-Cross | JY (Facelift) | 1.5 SZ-T, SZ5 | 2018-Present |
02
Suzuki SX4 S-Cross
CROSS-BRAND
K15B is documented across 2 BMW applications spanning Vitara, SX4 S-Cross. Registration lookup confirms the exact suffix before quotes are sent.
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Prices
Suzuki K15B Engine Replacement Cost (UK)
Condition | Supply Only | Fitted (Independent Specialist) | Typical Warranty |
|---|---|---|---|
Used | £800-£1,500 | £1,280-£2,150 | 3-6 months |
Reconditioned | £1,500-£2,500 | £1,980-£3,150 | 12-24 months |
Rebuilt | £2,500-£3,500 | £2,980-£4,150 | 12-24 months |
The K15B is a robust, naturally aspirated unit, so K15B engine replacement costs are primarily driven by the core block condition and the inclusion of updated ancillary components like the water pump and coil packs. Units with a documented history of regular oil changes command a slight premium due to lower internal wear. See our full reconditioned engine cost guide for a detailed breakdown of what is included.
Labour Guide
Fitting a K15B engine typically takes 8-10 hours at £65/hr (independent) - confirm exact labour when comparing quotes.
Price Factors
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Common Problems
Suzuki K15B Engine Problems - What Actually Fails
Every engine has its weak points. Here are the known issues with the K15B, based on real-world data and verified failure patterns.
Verified issue focus: Water pump seal weeping and ignition coil pack degradation.
1. Water Pump Seal Weeping and Coolant Leaks
1. Water Pump Seal Weeping and Coolant Leaks
Typical onset:
60,000-90,000 miles
What happens:
The water pump seal can degrade over time, leading to minor coolant seepage from the weep hole. While often slow, if ignored, it can lead to low coolant levels and subsequent overheating.
Repair vs replace:
A water pump replacement is a straightforward and inexpensive repair. It rarely necessitates a full K15B engine replacement unless severe overheating has already caused head gasket failure or warping.
Read more about this issue
2. Ignition Coil Pack Degradation
2. Ignition Coil Pack Degradation
Typical onset:
70,000+ miles
What happens:
Individual ignition coil packs can fail due to heat cycling and age, causing intermittent misfires, rough idling, reduced power, and an illuminated engine management light.
Repair vs replace:
Replacing the faulty coil pack (and often the spark plugs as preventative maintenance) resolves the issue completely. This is a standard maintenance item and does not require a K15B engine replacement.
Read more about this issue
The K15B Dualjet design is widely regarded by specialists as highly reliable. The dual-injector setup (one port, one direct) significantly reduces the carbon buildup issues commonly seen in older direct-injection-only engines, making it one of Suzuki's most robust modern petrol units .
Compare rebuilt K15B prices with the failure already addressed
Engine Variants
How to Confirm You Have the K15B
The K15B engine code is stamped on a machined pad on the engine block, typically visible near the oil filler cap or on the cylinder head. It is also explicitly listed on your vehicle’s V5C logbook under "Engine Capacity/Code" and can be verified via a VIN decode. Owners frequently confuse the K15B with the older M15A or the newer mild-hybrid K15C . While they share the same 1.5L displacement, the K15B is a naturally aspirated Dualjet unit, whereas the K15C incorporates a 12V integrated starter generator (ISG) and different ECU mapping. Fitting the wrong revision will result in electrical incompatibility, incorrect sensor readings, and immediate engine management faults.
Not 100% sure- Enter your registration above - we will confirm your exact K15B fitment before any quotes are sent.
Easily Confused
M15A
the older 1.5L naturally aspirated unit the K15B replaced, which lacked the Dualjet dual-injector setup and modern emissions mapping.
Alternative / Next-Gen Code
K15C
the updated mild-hybrid variant of the 1.5L Dualjet, adding a 12V integrated starter generator (ISG) for improved fuel efficiency and stop-start functionality.
Related JLR Variants
K14C
the 1.4L turbocharged Boosterjet engine found in the Swift Sport and earlier Vitara/S-Cross models, offering higher performance but requiring entirely different turbo plumbing and ECU mapping.
Confirm the exact K15B fitment
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Buying Guide
Buying a Replacement K15B - What to Choose
Choosing the right replacement route depends on your budget, risk tolerance, and ownership goals. Here's a breakdown of your options.
Used:
A used K15B is a viable, budget-friendly option given the engine's inherently robust, naturally aspirated design. However, ensure the service history confirms regular oil changes and that the water pump and coil packs have been inspected, as these are the most common wear items to inherit.
Reconditioned:
A proper reconditioned K15B is the most sensible choice for long-term peace of mind. Reputable suppliers will fit a new water pump, updated coil packs, and fresh seals as standard, directly addressing the unit's minor known wear points while retaining the reliable core block.
Rebuilt:
A full rebuild is rarely justified for the K15B unless the block has suffered catastrophic damage from severe overheating or oil starvation. A quality rebuild will include newly machined surfaces and all-new internal components, effectively resetting the engine's lifespan.
Supply & Fit Line:
We connect you with vetted UK specialists offering full K15B supply and fit packages, including nationwide delivery, professional installation, and a minimum 12-month warranty for complete peace of mind.
Vehicle Value Note:
The typical host vehicles for the K15B (e.g., modern Vitara and SX4 S-Cross) currently hold a market value between £8,000 and £18,000 . With a reconditioned replacement costing an estimated £1,500-£2,500, the repair represents a sensible fraction of the vehicle's value, making a K15B engine replacement a financially viable alternative to vehicle replacement for most owners.
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Related Engines
Engines Related to the Suzuki K15B
Explore engines that are closely related to the Suzuki K15B, including its predecessor, successor, and key family variants.
Predecessor
M15A
the older 1.5L naturally aspirated unit the K15B replaced, which lacked the Dualjet dual-injector setup and modern emissions mapping.
Successor
K15C
the updated mild-hybrid variant of the 1.5L Dualjet, adding a 12V integrated starter generator (ISG) for improved fuel efficiency and stop-start functionality.
Sibling
K14C
the 1.4L turbocharged Boosterjet engine found in the Swift Sport and earlier Vitara/S-Cross models, offering higher performance but requiring entirely different turbo plumbing and ECU mapping.
FAQ
Suzuki K15BFrequently Asked Questions
Question 1How much does a Suzuki K15B engine replacement cost-
A reconditioned Suzuki K15B engine typically costs between £1,500 and £2,500 for supply only, with fully fitted prices ranging from £1,980 to £3,150 . Supply-only reconditioned units include a new water pump and updated coil packs. Labour typically adds 8-10 hours at independent specialist rates.
- Supply-only reconditioned units include a new water pump and updated coil packs.
- Labour typically adds 8-10 hours at independent specialist rates.
Question 2What is the most common problem with the K15B Dualjet engine-
The most documented issue is water pump seal weeping, which typically appears between 60,000 and 90,000 miles and can lead to coolant loss and overheating. Ignoring coolant leaks can result in severe engine damage, necessitating a full replacement. Ignition coil pack degradation is a secondary issue causing misfires and rough idling.
- Ignoring coolant leaks can result in severe engine damage, necessitating a full replacement.
- Ignition coil pack degradation is a secondary issue causing misfires and rough idling.
Question 3Which Suzuki models use the K15B engine-
The K15B Dualjet is fitted to the Suzuki Vitara (LY facelift) and SX4 S-Cross (JY facelift) from 2018 onwards. It is the current-generation naturally aspirated petrol engine for Suzuki's core crossover lineup. Always verify your specific chassis code, as earlier models use the older M15A engine.
- It is the current-generation naturally aspirated petrol engine for Suzuki's core crossover lineup.
- Always verify your specific chassis code, as earlier models use the older M15A engine.
Question 4Should I buy a used or reconditioned K15B engine-
A reconditioned K15B is strongly recommended over a used unit due to the engine's specific wear patterns. Used units risk inheriting undocumented water pump seal wear or degraded coil packs. Reputable reconditioners replace the water pump, seals, and coil packs as standard.
- Used units risk inheriting undocumented water pump seal wear or degraded coil packs.
- Reputable reconditioners replace the water pump, seals, and coil packs as standard.
Question 5How do I know if my car has the K15B engine-
The K15B code is stamped on a machined pad on the engine block, typically visible near the oil filler cap, and is explicitly listed on your V5C logbook. It is frequently confused with the older M15A or the newer mild-hybrid K15C. Fitting the wrong revision will result in electrical incompatibility and sensor faults.
- It is frequently confused with the older M15A or the newer mild-hybrid K15C.
- Fitting the wrong revision will result in electrical incompatibility and sensor faults.
Compare Suzuki K15B Engine Prices Today
Get a free, no-obligation price comparison for your exact Suzuki K15B. Our registration lookup confirms your fitment before any quotes are sent, ensuring you receive parts specific to your Vitara or SX4 S-Cross. With reconditioned K15B units offering excellent value, comparing takes two minutes and could save you hundreds on your repair.
Vetted UK Specialists
Vetted UK specialists for K15B replacements
Minimum 12-Month Warranty
Minimum 12-month warranty on reconditioned and rebuilt options
Nationwide Delivery
Nationwide delivery plus supply and fit availability
Expert Support
Secure enquiry - no spam. Quotes only from vetted UK engine specialists.
Secure enquiry - no spam. Quotes only from vetted UK engine specialists.
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