Suzuki Swift 1.2 Dualjet Mild Hybrid Engine ReplacementCompare Prices & Get Quotes
Get free quotes today from trusted UK Suzuki Swift 1.2 Dualjet Mild Hybrid engine specialists. Compare prices on reconditioned, rebuilt and used engines for your K12C Dualjet - supply & fit available nationwide.
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12-Month Warranty
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From £1,500 to £2,800
Used from £450 · Reconditioned from £1,500 · Common codes: K12C
From £450
Tested, bare/short engine
From £1,500
Rod bearings addressed, tested
From quote
Upgraded bearings, full teardown, revised valvetrain
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3 Simple Steps3 Simple Stepsto Finding the Best Suzuki Swift 1.2 Dualjet Mild Hybrid Replacement Engineto Finding the Best Suzuki Swift 1.2 Dualjet Mild Hybrid Replacement Engine
Most replacements completed within 3-5 days.
Variant HistorySuzuki Swift 1.2 Dualjet Mild Hybrid - Engine History & Specs at a Glance
The Suzuki Swift 1.2 Dualjet Mild Hybrid arrived in 2017 as part of the third-generation Swift range, introducing Suzuki's K12C Dualjet engine with a 12-volt mild-hybrid system to improve fuel efficiency and reduce emissions without compromising the Swift's reputation for reliability and driving enjoyment.
Variant HistorySuzuki Swift 1.2 Dualjet Mild Hybrid - Engine History & Specs at a Glance
The Suzuki Swift 1.2 Dualjet Mild Hybrid arrived in 2017 as part of the third-generation Swift range, introducing Suzuki's K12C Dualjet engine with a 12-volt mild-hybrid system to improve fuel efficiency and reduce emissions without compromising the Swift's reputation for reliability and driving enjoyment.
Suzuki Swift 1.2 Dualjet Mild Hybrid
Fuel TypePetrol/Electric Hybrid (Mild Hybrid)
Engine Size Range1.2L (1242cc)
Power Output Range90hp (K12C) / 83hp (K12D)Engine History Timeline
K12C 1.2-litre four-cylinder Dualjet naturally aspirated petrol engine launched with 90hp paired with a 12V mild-hybrid system (SHVS) in UK and European markets
Production continues with minor specification updates; SZ-T and SZ5 trim levels available
Euro 6d-TEMP emissions compliance introduced
Facelift introduces K12D Dualjet Hybrid engine replacing K12C with 83hp and revised mild-hybrid system
2023 - K12D continues as the sole 1.2 Dualjet Hybrid option in the UK market
Key Specs Snapshot
Fuel TypePetrol/Electric Hybrid (Mild Hybrid)Engine Size Range1.2L (1242cc)Power Output Range90hp (K12C) / 83hp (K12D)Years Produced2017-2020 (K12C); 2020-present (K12D)Every engine fitted to the Suzuki Swift 1.2 Dualjet Mild Hybrid is covered below, with UK rebuilt pricing and known failure points.
Suzuki Swift 1.2 Dualjet Mild Hybrid Engine Codes - Specifications & Replacement CostSuzuki Swift 1.2 Dualjet Mild Hybrid Engine Codes - Specifications & Replacement Cost
1.2L Dualjet Petrol Mild Hybrid (2017-2020)
Power Output90hp (66kW)Years Fitted2017-2020
Compatible Trim Levels
- SZ3
- SZ-T
- SZ5
Find your exact engine code, specs and UK replacement cost guide.
Used
Tested, ready-to-fit engine
£450-£900
Reconditioned
Addressed known issues, tested
£1,500-£2,800
Rebuilt
Full teardown, upgraded internals
£2,000-£3,500
Common Failure
Timing chain tensioner wear is a reported issue on the K12C engine, with some owners noting a rattling noise on start-up or at operating temperature. The Dualjet injector system can also experience issues, with reports of injectors failing to seal properly. However, overall reliability is considered above average, with the timing chain expected to last the life of the engine with proper maintenance.
The Suzuki Swift 1.2 Dualjet Mild Hybrid's K12C and K12D engines are generally regarded as reliable units, but a few issues have been reported by owners. The most common concerns are timing chain tensioner wear on earlier K12C engines and injector sealing problems across the Dualjet family. Rebuilt engines through EnginesMarket include upgraded components addressing the original failure points, plus a minimum 12-month unlimited-mileage warranty.
Why the Suzuki Swift 1.2 Dualjet Mild Hybrid K12C Develops Rattle
Affected Vehicles
Suzuki Swift 1.2 Dualjet Mild Hybrid (K12C, 2017-2020)
Typical Failure Mileage
60,000-100,000 miles
Root Cause
The K12C engine uses a timing chain with a hydraulic tensioner. Some owners have reported a rattling noise on cold start-up or at operating temperature, which may indicate tensioner wear or chain stretch.
Why It Happens
The K12C engine uses a timing chain with a hydraulic tensioner. Some owners have reported a rattling noise on cold start-up or at operating temperature, which may indicate tensioner wear or chain stretch.
Dealer (parts + labour)
£800-£1,200
Specialist (parts + labour)
£500-£800
What it involves
Replacement of timing chain tensioner and guides
Suitability
Best if caught early with rattle; prevents further wear
1 - 2 daysDealer (parts + labour)
£2,800-£4,500
Specialist (parts + labour)
£2,000-£3,500
What it involves
Supply & fit of rebuilt K12C with upgraded timing components, 12-month warranty
Suitability
When chain has failed or engine has other significant issues
1 - 2 daysAll prices are indicative UK market ranges based on current UK specialist supplier data.| Repair Tier | Dealer (Parts + Labour) | Specialist (Parts + Labour) | What It Involves | Suitability | Estimated Time |
|---|---|---|---|---|---|
 Timing chain tensioner replacement Minor | £800-£1,200 | £500-£800 | Replacement of timing chain tensioner and guides | Best if caught early with rattle; prevents further wear | 1 - 2 days |
 Full Replacement - rebuilt/reconditioned engine Best Value | £2,800-£4,500 | £2,000-£3,500 | Supply & fit of rebuilt K12C with upgraded timing components, 12-month warranty | When chain has failed or engine has other significant issues | 1 - 2 days |
Vehicle Value Check
Vehicle Value Check
A typical 2017-2020 Suzuki Swift 1.2 Dualjet Mild Hybrid with 40,000-70,000 miles is valued between £5,000 and £12,000 depending on condition and spec [THIRD-PARTY - Parkers/Auto Trader market observation]. With replacement cost typically under £3,500 fitted through a specialist, the investment is usually justified relative to vehicle value for most examples. However, if the vehicle has covered over 100,000 miles or shows significant other wear, weigh the replacement cost against the car's overall condition.
Our Recommendation
Our Recommendation
If you hear a rattling noise from your Suzuki Swift 1.2 Dualjet Mild Hybrid on start-up, have the timing chain inspected immediately - catching it early could save you thousands. The K12C engine is generally reliable, and a timing chain tensioner replacement is a manageable repair. If the engine has already failed or is showing multiple issues, a rebuilt unit with upgraded components offers the best long-term reliability.
Don't Let Engine Failure Write Off Your Suzuki Swift 1.2 Dualjet Mild Hybrid
The Suzuki Swift 1.2 Dualjet Mild Hybrid is a reliable and efficient daily driver, but when the engine does fail, a proper rebuilt unit with upgraded components and a 12-month warranty is the most reliable path forward. Compare quotes from our network of specialists today - supply and fit available nationwide, with prices that beat main dealer every time.
Compare rebuilt K12C Suzuki Swift 1.2 Dualjet Mild Hybrid engine prices
12-Month Minimum
UK Specialists Vetted
Best Price GuidanceImportant Information
Important Information
"All prices are indicative UK market ranges based on historical quote data and repair requests from our network of engine specialists. Dealer pricing is estimated based on published main dealer labour rates and genuine OEM parts pricing. Specialist pricing reflects actual quote data from EnginesMarket's UK network. Actual costs vary depending on damage severity, vehicle condition, variant, and workshop location within the UK. Use our free comparison tool to get tailored quotes for your specific Suzuki Swift 1.2 Dualjet Mild Hybrid. Every engine supplied through EnginesMarket carries a minimum 12-month unlimited mileage warranty - always confirm exact terms with your chosen supplier."
Suzuki Swift 1.2 Dualjet Mild Hybrid Engine ReplacementFrequently Asked Questions
Question 1How much does a Suzuki Swift 1.2 Dualjet Mild Hybrid engine replacement cost-
A replacement Suzuki Swift 1.2 Dualjet Mild Hybrid engine typically costs between £2,000 and £3,500 for a rebuilt unit fitted by a specialist. Used engines start from around £450 supply-only.
- Rebuilt: £2,000-£3,500 fitted with 12-month warranty
- Reconditioned: £1,500-£2,800 supply-only
- Used: £450-£900 supply-only
Question 2What are the signs of timing chain failure in a Suzuki Swift 1.2 Dualjet Mild Hybrid-
The most common early warning is a rattling noise from the engine on cold start-up, which may persist as the engine warms up.
- Rattling or chattering noise on start-up
- Check engine light with cam/crank correlation codes
- Loss of performance or poor running
- If you hear these sounds, have the timing chain inspected immediately
Question 3Is it worth replacing the engine in a Suzuki Swift 1.2 Dualjet Mild Hybrid-
A typical 2017-2020 Suzuki Swift 1.2 Dualjet Mild Hybrid retains significant value (£5,000-£12,000 depending on condition and mileage), so a rebuilt engine at £2,000-£3,500 fitted is usually a sound investment.
- Vehicle value typically justifies replacement cost
- Rebuilt units include upgraded components preventing recurrence
- 12-month unlimited-mileage warranty provides peace of mind
- Compare replacement options against vehicle value and condition
Question 4How long does a Suzuki Swift 1.2 Dualjet Mild Hybrid engine replacement take-
A full engine replacement typically takes 2-5 days depending on the workshop's schedule and parts availability.
- Engine supply: 1-2 days for delivery
- Fitting: 1-3 days for a specialist
- Always confirm turnaround time with your chosen supplier
Question 5What causes Suzuki Swift 1.2 Dualjet Mild Hybrid engine failure-
The K12C engine in the Suzuki Swift 1.2 Dualjet Mild Hybrid is prone to two primary issues: timing chain tensioner wear and injector sealing problems.
- Timing chain tensioner wear can cause rattle and potential timing issues
- Dualjet injectors can fail to seal, leading to fuel in cylinders after shutdown
- The 12V mild-hybrid system components (battery, ISG) can also fail independently
- Regular servicing and early attention to warning signs are critical
Question 6What's the difference between the K12C and K12D engines-
The K12C was the original 1.2 Dualjet engine used from 2017 to 2020, producing 90hp. The K12D replaced it from 2020 onwards with 83hp and a revised 12V mild-hybrid system.
- K12C: 90hp, used 2017-2020
- K12D: 83hp, used 2020-present
- Both are 1.2-litre four-cylinder Dualjet petrol engines with mild-hybrid assistance
- The K12D features a more efficient 12V hybrid system with a larger lithium-ion battery
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