Mazda 3 1.5 SkyactivG Engine Replacement - Compare Prices & Get Quotes
Need a Mazda 3 1.5 Skyactiv-G engine replacement- Compare quotes from trusted UK Mazda 3 1.5 Skyactiv-G engine specialists for reconditioned, rebuilt and used engines. Get free Mazda 3 1.5 Skyactiv-G engine quotes today and save on specialist supply and fit.
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From £1,200 to £2,500
Used from £600 · Reconditioned from £1,200 · Common codes: P5Z3, P5X4 (2013-2025, 100-120PS)
From £600
Tested, bare/short engine
From £1,200
Rod bearings addressed, tested
From quote
Upgraded bearings, full teardown, revised valvetrain
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3 Simple Steps3 Simple Stepsto Finding the Best Mazda 3 1.5 Skyactiv-G Replacement Engineto Finding the Best Mazda 3 1.5 Skyactiv-G Replacement Engine
Most replacements completed within 3-5 days.
Variant HistoryMazda 3 1.5 Skyactiv-G - Engine History & Specs at a Glance
The Mazda 3 1.5 Skyactiv-G was introduced in 2013 with the third-generation BM model, replacing the older 1.6L MZR petrol engine. The 1.5L unit, part of Mazda's Skyactiv-G engine family, uses high-compression ratio technology and direct fuel injection for improved fuel economy and lower emissions . The engine has continued through multiple generations, including the BN facelift and the current BP generation (2019-present), with refinements to meet Euro 6d emissions standards and mild-hybrid integration in later models .
Variant HistoryMazda 3 1.5 Skyactiv-G - Engine History & Specs at a Glance
The Mazda 3 1.5 Skyactiv-G was introduced in 2013 with the third-generation BM model, replacing the older 1.6L MZR petrol engine. The 1.5L unit, part of Mazda's Skyactiv-G engine family, uses high-compression ratio technology and direct fuel injection for improved fuel economy and lower emissions . The engine has continued through multiple generations, including the BN facelift and the current BP generation (2019-present), with refinements to meet Euro 6d emissions standards and mild-hybrid integration in later models .
Mazda 3 1.5 Skyactiv-G
Fuel TypePetrol
Engine Size1.5L (1496cc)
Power Output Range100-120PS (74-88kW)Engine History Timeline
Mazda 3 BM launched with 1.5 Skyactiv-G (P5Z3) producing 100-120PS
BN facelift introduced; 1.5 Skyactiv-G continues with P5Z3/P5Y4/P5Y5 codes power output 100-120PS
BP generation launched; 1.5 Skyactiv-G updated (P5X4/P5X5) with 120PS and improved emissions compliance
BP generation continues with 1.5 Skyactiv-G and mild-hybrid technology for select variants
Key Specs Snapshot
Fuel TypePetrolEngine Size1.5L (1496cc)Power Output Range100-120PS (74-88kW)Years Produced2013-presentTiming SystemTiming chainEvery engine fitted to the Mazda 3 1.5 Skyactiv-G is covered below, with UK rebuilt pricing and known failure points for the P5Z3 and P5X4 units.
Mazda 3 1.5 Skyactiv-G Engine Codes - Specifications & Replacement CostMazda 3 1.5 Skyactiv-G Engine Codes - Specifications & Replacement Cost
1.5L Skyactiv-G Petrol (2013-2024)
Power Output100-120PS (74-88kW)Torque146-150Nm at 3,500-4,000rpmYears Fitted2013-2024Displacement1496ccTiming SystemTiming chainFuel SystemDirect injection (GDI)
Compatible Trim Levels
- SE Nav
- Sport Nav
- GT Sport
- SE-L
- SE-L Nav (BM/BN generations)
Find your exact engine code, specs and UK replacement cost guide.
Used
Tested, ready-to-fit engine
£600-£1,200
Reconditioned
Addressed known issues, tested
£1,200-£1,800
Rebuilt
Full teardown, upgraded internals
£1,800-£2,800
Common Failure
Carbon buildup on intake valves is an inherent drawback of direct injection engines, and the Skyactiv-G 1.5L variant is susceptible. This can lead to misfires, fouled spark plugs, and reduced power . The 1.5L Skyactiv-G was also subject to an engine ECU recall (Japan 2019) affecting 7,162 Mazda3 1.5L units due to incorrect fuel injection control that could cause engine stalling at low speed . Fuel pump failures have also been reported across the Skyactiv-G range .
The Mazda 3 1.5 Skyactiv-G is generally regarded as a reliable and economical engine. However, as a direct-injection petrol engine, it has well-documented weaknesses - primarily carbon buildup on intake valves and potential software/fuel system issues . Rebuilt engines through EnginesMarket include upgraded components addressing the original failure points, plus a minimum 12-month unlimited-mileage warranty.
The Direct Injection Achilles' Heel
Affected Vehicles
Mazda 3 1.5 Skyactiv-G (P5Z3/P5X4, 2013-present)
Typical Failure Mileage
60,000-100,000 miles
Root Cause
Direct injection engines inject fuel directly into the combustion chamber, bypassing the intake valves. Over time, oil blow-by and crankcase ventilation deposits accumulate carbon on the intake valves, leading to restricted airflow, misfires, rough idle, and reduced power .
Why It Happens
Direct injection engines inject fuel directly into the combustion chamber, bypassing the intake valves. Over time, oil blow-by and crankcase ventilation deposits accumulate carbon on the intake valves, leading to restricted airflow, misfires, rough idle, and reduced power .
Dealer (parts + labour)
£150-£300
Specialist (parts + labour)
£80-£150
What it involves
Injector cleaner, fuel system flush, new spark plugs
Suitability
Preventative; may temporarily improve mild symptoms
1 - 2 daysDealer (parts + labour)
£600-£900
Specialist (parts + labour)
£400-£700
What it involves
Media-blasting of intake valves to remove carbon deposits, new intake manifold gaskets
Suitability
Effective for moderate buildup; extends engine life
1 - 2 daysDealer (parts + labour)
£3,000-£4,500
Specialist (parts + labour)
£1,800-£2,800
What it involves
Supply & fit, rebuilt P5Z3/P5X4 with serviced injectors, 12-month warranty
Suitability
If carbon buildup has caused secondary damage (valve, piston, or injector failure)
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 |
|---|---|---|---|---|---|
 Fuel System Service Minor | £150-£300 | £80-£150 | Injector cleaner, fuel system flush, new spark plugs | Preventative; may temporarily improve mild symptoms | 1 - 2 days |
 Walnut Blasting Best Value | £600-£900 | £400-£700 | Media-blasting of intake valves to remove carbon deposits, new intake manifold gaskets | Effective for moderate buildup; extends engine life | 1 - 2 days |
Full Replacement - rebuilt engine Best Value | £3,000-£4,500 | £1,800-£2,800 | Supply & fit, rebuilt P5Z3/P5X4 with serviced injectors, 12-month warranty | If carbon buildup has caused secondary damage (valve, piston, or injector failure) | 1 - 2 days |
Our Recommendation
Our Recommendation
The 1.5 Skyactiv-G is fundamentally robust, but preventative maintenance is essential. If your Mazda 3 1.5 Skyactiv-G is approaching 60,000+ miles and you're noticing rough idle or hesitation, consider a professional intake valve cleaning (walnut blasting) before considering replacement. This is significantly cheaper than a full engine rebuild and addresses the most common failure point.
Don't Let Engine Failure Write Off Your Mazda 3 1.5 Skyactiv-G
The 1.5 Skyactiv-G engine is generally robust, but direct injection carbon buildup and fuel pump issues can cause significant problems over time. Preventative maintenance - including walnut blasting at 60,000-80,000 miles and checking for outstanding recalls - can extend your engine's life. If you're facing a major repair, compare rebuilt and used engine prices through our specialist network. Enter your registration now for free, no-obligation quotes tailored to your exact Mazda 3 1.5 Skyactiv-G.
Compare rebuilt P5Z3 Mazda 3 1.5 Skyactiv-G 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 Mazda 3 1.5 Skyactiv-G. Every engine supplied through EnginesMarket carries a minimum 12-month unlimited mileage warranty - always confirm exact terms with your chosen supplier."
Mazda 3 1.5 Skyactiv-G Engine ReplacementFrequently Asked Questions
Question 1How much does a Mazda 3 1.5 Skyactiv-G engine replacement cost-
A Mazda 3 1.5 Skyactiv-G engine replacement typically costs £600-£1,200 for a used unit, £1,200-£1,800 for reconditioned, and £1,800-£2,800 for a rebuilt engine with 12-month warranty [ESTIMATED]. Specialist fitting costs add £400-£650. The Mazda 3 1.5 Skyactiv-G engine uses a timing chain, so no timing belt replacement interval applies .
- Used P5Z3/P5X4: £600-£1,200 supply-only
- Reconditioned: £1,200-£1,800 supply-only
- Rebuilt with warranty: £1,800-£2,800 supply-only
- Specialist fitting: £400-£650
Question 2Is the Mazda 3 1.5 Skyactiv-G a reliable engine-
The 1.5 Skyactiv-G is generally regarded as a reliable and fuel-efficient engine, with many owners reporting 200,000+ miles with regular maintenance . However, as a direct injection engine, carbon buildup on intake valves is a well-documented issue that requires preventative maintenance . Additionally, the engine was subject to a 2019 ECU software recall for fuel injection control . With regular maintenance and the recall addressed, the 1.5 Skyactiv-G is a durable unit.
- Reliable with proper maintenance
- Carbon buildup is the main issue
- 2019 ECU recall affected 7,162 units
Question 3Does the Mazda 3 1.5 Skyactiv-G have a timing belt or chain-
The Mazda 3 1.5 Skyactiv-G uses a timing chain, not a belt . The chain is designed for the life of the engine with proper servicing . The chain is a simplex closed chain with 60 links . There's no scheduled replacement interval, but regular oil changes with the correct specification are essential for timing chain longevity - lack of lubrication can cause chain stretch and tensioner failure .
- Timing chain, not belt
- 60-link simplex closed chain
- No scheduled replacement interval
- Regular oil changes critical for chain life
Question 4What are the signs of carbon buildup on a Mazda 3 1.5 Skyactiv-G-
Common signs of carbon buildup on intake valves include rough idle, hesitation on acceleration, reduced power, misfire codes (P0300-P0304), and poor fuel economy . The 1.5 Skyactiv-G is susceptible to carbon buildup on intake valves due to its direct injection design . Professional walnut blasting is the most effective solution, typically costing £400-£700 at an independent specialist.
- Rough idle and hesitation
- Reduced power
- Misfire codes
- Professional walnut blasting recommended
Question 5Was there a recall on the Mazda 3 1.5 Skyactiv-G-
Yes. In 2019, Mazda issued a recall affecting 7,162 Mazda3 1.5L Skyactiv-G units in Japan for an engine ECU software issue. The recall addressed incorrect fuel injection control that could cause incomplete combustion, leading to engine stalling at low speed or inability to restart after idle-stop activation . Check your VIN on the DVSA recall checker to see if your vehicle is affected.
- ECU software recall affected 7,162 1.5L units
- Addressed fuel injection control issue
- Check VIN on DVSA recall checker
- Mazda also issued fuel pump recall/extended warranty
Question 6Is it worth replacing the engine in a Mazda 3 1.5 Skyactiv-G-
With 2013-2024 Mazda 3 1.5 Skyactiv-G values ranging from £3,500-£18,000 [INDUSTRY ESTIMATE], a rebuilt engine at £1,800-£2,800 represents 15-50% of the vehicle's value. The Mazda 3's strong retained values and the 1.5 Skyactiv-G's reputation for fuel economy make a rebuilt engine generally viable. For older high-mileage BM/BN models valued under £4,000, a used engine may be the more sensible choice.
- Vehicle value: £3,500-£18,000
- Rebuilt engine: £1,800-£2,800
- Replacement viable for most examples
- Used engine recommended for sub-£4,000 vehicles
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Compare Mazda 3 1.5 Skyactiv-G engine replacement quotes from trusted UK specialists. Whether you need a used P5Z3, a reconditioned unit, or a fully rebuilt engine with 12-month warranty, our network delivers competitive pricing across the UK. Enter your registration now for free, no-obligation quotes tailored to your exact Mazda 3 1.5 Skyactiv-G - with supply and fit options available nationwide.
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