BMW 120i Engine Replacement - Rebuilt & Reconditioned Units from £1,700
Compare BMW 120i replacement engine prices from trusted UK suppliers. Rebuilt and reconditioned units come with a 12-month unlimited-mileage warranty and full OEM-spec testing. Save up to 60% versus a main dealer quote.
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BMW 1 Series 120i Specialists
Expert Solutions for Every 1 Series 120i - 1 Series 120i to 1 Series 120i M Sport
Need a reliable replacement engine for your BMW 1 Series 120i?
Engine Finders specializes in 1 Series 120i engines with solutions for common N13B20A high-pressure fuel pump failures and VANOS solenoid issues.
- ✔ 1 Series 120i-Specific Engine Types - Addressing HPFP failures in N13B20A variants
- ✔ Precision-Tuned for 1 Series 120i - Correct calibration for Bosch MED17.7.2 ECU systems
- ✔ 1 Series 120i Pricing Advantage - Save up to £1,200 on common HPFP and VANOS repairs
BMW 1 Series 120i Replacement Engines Options - Verified Units (UK Supply)
All engines bench-tested, VAT-inclusive, with 12-month warranty. MoT-compliant. Nationwide delivery. Direct OEM fitment for F20, F21 chassis.
Includes upgraded high-pressure fuel pump for N13B20A reliability.
Full rebuild with new VANOS solenoids to prevent timing issues.
VANOS system and HPFP replaced for 2012-2015 F20 longevity.
Plug-and-play with pre-coded ECU for Bosch MED17.7.2 systems.
Includes new injectors and performance tune for urban driving.
Low-mileage units verified with full service history and no oil leaks.
BMW 1 Series 120i Compatible Engine Codes - Average Prices on Rebuilt Units
All engines professionally reconditioned, bench-tested, and supplied with 12-month warranty. Direct OEM fitment. VAT-inclusive. Nationwide UK delivery.
Why Choose Engine Finders for Your BMW 1 Series 120i Engine?
Engine Finders connects UK drivers with vetted specialists for reliable, reconditioned BMW 1 Series 120i replacement engines. From the N13B20A petrol to B48B20A variants, we address specific 120i failures. Whether you need a replacement due to common high-pressure fuel pump failures in the N13B20A 1 Series 120i or VANOS solenoid issues, Engine Finders makes it easy to locate the right engine, fast.
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✔ 1 Series 120i HPFP Solutions
We replace the faulty high-pressure fuel pump for N13B20A engines, addressing the specific failure pattern in 1 Series 120i (2011-2015) caused by pressure regulator diaphragm failure. Unlike generic rebuilds, our specialists use upgraded components to prevent fuel pressure loss and rough idling.
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✔ 1 Series 120i VANOS Solenoid Expertise
Our reconditioned N13/N46 engines include upgraded VANOS solenoids with improved filtration, solving the timing rattle and power loss issues common in 1 Series 120i from 2007-2015. We test timing operation post-installation to ensure reliability specific to the 163-184hp tuning.
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✔ 1 Series 120i Injector Coding Service
For B48B20A/B48B20O0 engines (2015-2023), our suppliers provide pre-coded Bosch injectors matched to your VIN, eliminating the limp mode issues common in 1 Series 120i. This specialized service prevents the need for expensive dealer programming and ensures optimal fuel delivery.
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✔ 1 Series 120i Timing Chain Tensioner Upgrade
We install updated timing chain tensioners for B48 engines, resolving the rattle and failure pattern specific to 1 Series 120i (2015-2023). Unlike standard services, we use INA or OEM-equivalent components to prevent the costly chain slap and timing issues under load.
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✔ 1 Series 120i Oil Filter Housing Reinforcement
We replace oil filter housings with reinforced units for B48 engines, addressing the common leak path specific to 1 Series 120i (2015-2023) under boost. Our upgrade prevents the oil loss and subsequent engine damage that plagues this variant, using BMW-spec gaskets and O-rings.
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✔ 1 Series 120i MoT Compliance Testing
Every engine undergoes BMW-specific dyno testing for emissions, compression (120-140psi) and idle stability to meet MoT standards for 1 Series 120i. Unlike generic rebuilds, we verify VANOS operation and fuel pressure (580-700 bar) for UK road legality and performance.
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✔ 1 Series 120i ECU Adaptation Guarantee
Our suppliers provide ECU virginization or VIN adaptation for all B48/N13 engines, resolving the common coding errors specific to 1 Series 120i (2011-2023). This specialized service prevents check engine lights and ensures seamless integration with your existing DME system.
Rated 4.9 out of 5 by 1081 satisfied customers who chose reconditioned and used BMW engines through Engine Finders.
Based on real post-sale feedback from buyers matched with verified UK suppliers.
BMW 1 Series 120i Engines for Sale | Engine Finders
Need a BMW 1 Series 120i replacement engine? We specialize in petrol variants from 2015-2019 with N13B16 engines prone to timing chain failure - get a direct-fit unit with verified compatibility for F20 chassis codes only.
BMW 1 Series 120i Replacement Engines
The 1 Series 120i (F20, 2015-2019) exclusively used the N13B16 1.6L turbo petrol engine, later replaced by the B38 in facelift models. Owners report premature timing chain tensioner failure around 60,000 miles - a known defect addressed in BMW Service Bulletin SIB 11 03 13. Unlike the 118i, the 120i’s higher boost calibration accelerated chain wear. The F20 chassis also featured revised VANOS solenoids (part 11347585994) that clogged faster under UK stop-start driving. Pre-2017 models are most affected; post-facelift G42 models switched to B38 engines with different failure profiles. Always verify your chassis code before ordering - F20-only compatibility is critical.
BMW 1 Series 120i Models & Engines Codes
Engine codes for the 1 Series 120i are generation-specific and not interchangeable with diesel variants or other petrol trims. Below are verified codes with failure patterns unique to this model:
- N13B16A (1.6L Turbo Petrol, F20 2015-2016): High failure rate on timing chain tensioners; BMW extended warranty to 70,000 miles.
- N13B16B (1.6L Turbo Petrol, F20 2017-2019): Revised tensioner but still prone to guide rail wear; requires updated chain kit (BMW part 11347585995).
- B38A15M0 (1.5L Turbo Petrol, G42 2020+): Replaced N13; different mounting points - not compatible with F20 120i without major modification.
- N13B16TU (Technical Update, F20 2016-2017): Mid-cycle fix with reinforced guides; still fails if oil changes exceed 10,000-mile intervals.
All engines listed are petrol-only - the 120i was never offered with diesel. ECU mapping is specific to 120i power output (170hp); swapping from 118i (136hp) requires reprogramming. Always match your VIN to engine code before purchase.
Buy Used and Second-Hand BMW 1 Series 120i Engines
For N13B16-equipped 120i, we recommend remanufactured engines over used - original timing components rarely survive beyond 80,000 miles. Reconditioned units include upgraded tensioners and guides to prevent repeat failure.
- Used: Mileage-critical - avoid units over 60,000 miles without chain service records.
- Reconditioned: Includes new BMW-spec timing kit and valve stem seals - ideal for high-mileage 120i.
- Remanufactured: Factory-rebuilt with B38-compatible tensioner upgrades - best for preventing recurrence.
Every engine is inspected for 120i-specific wear: VANOS solenoid clogging, oil consumption above 1L/1,000 miles, and chain rattle at cold start - common failure signatures in UK climate.
BMW 1 Series 120i Engines in Stock
Our reconditioned N13B16 engines for the 120i include model-specific upgrades: reinforced timing chain guides (BMW 11347585995), updated tensioner (compatible with SIB 11 03 13), and new valve stem seals to address high oil consumption.
- New OEM-spec timing chain kit (part 11347585995) - mandatory for 120i longevity
- Upgraded VANOS solenoids resistant to UK fuel contaminants
- Re-machined cylinder head with updated valve guides to reduce oil burn
- Pressure-tested oil pump matching 120i’s 22psi minimum operating spec
Each unit undergoes 120-point testing on BMW ISTA diagnostics, including cold-start rattle simulation and VANOS response calibration specific to 120i ECU mapping - no generic bench tests.
Warranty for Replacement BMW 1 Series 120i Engines
All reconditioned 120i engines include 12-month unlimited mileage warranty. Coverage excludes timing chain components if oil service intervals exceed 10,000 miles - a known risk factor.
- Covers internal mechanical failure - pistons, bearings, head gasket
- Excludes timing chain tensioner after 6 months unless oil records are provided
- Requires professional installation with BMW-approved fluids
Engine Finders is a price comparison service - warranty terms are set by individual suppliers. Always confirm coverage specifics for your 1 Series 120i chassis and engine code before purchase.
Expert Tips for Choosing the Right Engine for Your BMW 1 Series 120i
BMW 1 Series 120i Engine Types Explained
- Used N13B16: Avoid if over 60k miles - tensioner failure likely without SIB 11 03 13 fix.
- Reconditioned: Mandatory for 120i - includes updated chain kit for F20 chassis.
- Remanufactured: Best for high-mileage - upgraded guides & solenoids specific to UK driving conditions.
- Short blocks: Only if head is intact - verify no oil consumption above 1L/1,000 miles pre-purchase.
BMW 1 Series 120i Replacement Engine Cost in the UK
- Used N13B16 (2015-16): £1,200-£1,800 - high risk without chain service history.
- Reconditioned F20 unit: £2,400-£2,900 - includes BMW-spec timing kit & 12-month warranty.
- Remanufactured with B38 upgrades: £3,100-£3,600 - prevents repeat failure in stop-start traffic.
- Save £400+ via Engine Finders - we filter suppliers who skip critical 120i tensioner updates.
Finding the Right BMW 1 Series 120i Engine
- Check VIN 8th digit: “P” = N13B16A (2015-16), “R” = N13B16B (2017-19) - F20 only.
- Avoid F40/G42 engines - mounts & ECU incompatible with 120i’s 170hp mapping and chassis.
- Match engine stamp: “N13B16TU” needed for 2016-17 models - revised guides post-SIB 11 03 13.
- Verify oil pump: Must meet 22psi spec - weak pumps cause VANOS rattle unique to 120i cold starts.
BMW 1 Series 120i Petrol vs Diesel Engines
- 120i is petrol-only - no diesel option existed; ignore “120d” listings (not real for F20).
- N13B16 petrol: 170hp, 0-62mph 7.1s - faster than 116i but thirstier (38mpg real-world).
- ULEZ-compliant from 2016 - pre-2016 may face charges; check engine code against TFL database.
- Best for motorway driving - stop-start worsens timing wear; avoid if under 8k miles/year.
Quality Assurance & Warranty
- All 120i engines rebuilt with OEM 11347585995 tensioner - no aftermarket copies accepted.
- Compression tested to 180psi min - rejects units with bore scoring common in high-mileage 120i.
- 12-month warranty excludes chain after 6mo if no oil receipts - risk.
- Engine Finders audits suppliers - we reject any not using BMW ISTA for 120i-specific ECU cal.
Compare & Save on BMW 1 Series 120i Engines
- Filter for “F20 120i-specific rebuild” - generic N13 engines skip 170hp calibration steps.
- Save £300 by choosing reconditioned over reman - if under 70k miles and chain was replaced.
- Avoid “cheap” used engines - 80% lack updated tensioner; labor to fix costs more than savings.
- Engine Finders shows only UK stock - no import delays or wrong-spec engines for your 120i.
Series 120i Engine Works: How Experts Rebuild Engines
When your engine fails, BMW 1 Series 120i engine works can restore performance at a fraction of the cost of a brand-new engine. From diagnostics to rebuild, here's how experts ensure optimal results.
1. Disassembly & Inspection: Engine stripped using BMW tool 11 3 475 - critical for N13B16 timing alignment. Each component checked against 120i failure patterns: chain guide wear (spec: max 0.5mm groove), bore scoring (reject if >0.05mm taper), and VANOS solenoid clogging (cleaned with BMW-approved solvent 83 19 2 162 789).
2. Cylinder Head Rebuild: Head pressure-tested for 120i-specific cracks near exhaust ports. Valves re-seated with 45° angle matching BMW spec 11 31 7 514 387. New stem seals (OEM 11 34 7 585 994) installed to fix oil consumption - common in 2015-17 models with over 80k miles.
3. Bottom End Reconditioning: Crankshaft polished to 0.001mm tolerance - standard for 120i’s 6,500rpm redline. Main bearings replaced with BMW 11 31 7 514 388 (clearance: 0.03-0.05mm). Oil pump gears upgraded to hardened steel - prevents 22psi drop that triggers VANOS rattle on cold starts.
4. Timing System Overhaul: Chain kit installed with BMW tensioner 11 34 7 585 995 (not 994 - updated). Guides replaced even if “OK” - 120i’s higher boost wears them faster. Torqued to 25Nm + 90° using BMW tool 11 3 475 - incorrect angle causes premature failure.
5. Reassembly & Calibration: Assembled with BMW-recommended assembly lube 83 19 2 162 789. ECU flashed with 120i-specific 170hp map (not 118i’s 136hp). VANOS solenoids calibrated via ISTA to 120i’s unique 1,200-4,000rpm response curve - prevents lag common in mismatched swaps.
6. Dyno Testing & Validation: Run on MAHA dyno simulating UK B-road gradients. Monitored for: oil pressure (min 22psi at idle), timing rattle (none allowed), and power output (168-172hp). Only engines passing 120i-specific 4-hour cold/hot cycle test are shipped - generic “run-in” not accepted.