BMW 320i Engine Replacement - Rebuilt & Reconditioned Units from £1,500

Compare BMW 320i 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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• Save up to 60% • Reconditioned Engine Specialists • 15 Years Experience • 100s of UK Suppliers • 12-24 Month Warranty • No Hidden Charges • Save up to 60% • Reconditioned Engine Specialists • 15 Years Experience • 100s of UK Suppliers • 12-24 Month Warranty • No Hidden Charges
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Engine Finders

BMW 3 Series 320i Specialists

Expert Solutions for Every 3 Series 320i - 320i to 320i

Need a reliable replacement engine for your BMW 3 Series 320i?
Engine Finders specializes in 3 Series 320i engines with solutions for common N47D20C failures.

  • ✔ 3 Series 320i-Specific Engine Types - Addressing timing chain wear in N47D20C variants
  • ✔ Precision-Tuned for 3 Series 320i - Correct calibration for E46 chassis electronics
  • ✔ 3 Series 320i Pricing Advantage - Save up to £800 on common diesel engine repairs
Find Your Perfect BMW 3 Series 320i Engine Today!
BMW 3 Series 320i engine replacement specialists | Engine Finders

BMW 3 Series 320i 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 E46.

BMW 3 Series 320i Rebuilt Engines

High-performance rebuilds with OEM parts. Includes updated VANOS solenoids and EGR valve for M54B30A reliability.

BMW 3 Series 320i Remanufactured Engines

Fully stripped and rebuilt to factory specs. Features new cylinder head and updated timing chain for E46 chassis.

BMW 3 Series 320i Reconditioned Engines

Thoroughly inspected and restored to working condition. Includes new HP fuel pump and glow plugs for reliable cold starts.

BMW 3 Series 320i Replacement Engines

Direct swap engines for minimal downtime. Pre-fitted with E46-specific engine mounts and wiring harness compatibility.

BMW 3 Series 320i Refurbished Engines

Cleaned, tested, and performance-tuned units. Features recalibrated ECU and optimized fuel injection mapping for E46 platform.

BMW 3 Series 320i Used Engines

Affordable options with verified mileage and history. Each unit includes comprehensive pre-delivery inspection and new gasket kit.

BMW 3 Series 320i 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.

Where to buy BMW 3 Series 320i replacement engine | Engine Finders

Why Choose Engine Finders for Your BMW 3 Series 320i Engine?

Engine Finders connects UK drivers with vetted specialists for reliable, reconditioned BMW 3 Series 320i replacement engines. From the N46B20 petrol variants to N52B30 engines, we address specific failure points unique to your model. Whether you need a replacement due to specific VANOS solenoid failures in the N46B20 3 Series 320i or timing chain issues, Engine Finders makes it easy to locate the right engine, fast.

  • ✔ 3 Series 320i-Specific VANOS Solenoid Solutions

    We replace the N46B20 VANOS solenoids with upgraded units designed to prevent oil pressure issues specific to E90 chassis 320i models from 2005-2008. Unlike other BMW variants, the 3 Series 320i's VANOS system has unique calibration requiring specialized components.

  • ✔ Timing Chain Tensioner Upgrades for N46B20

    Our reconditioned N46B20 engines for 3 Series 320i (E90, 2008-2011) include upgraded timing chain tensioners to address the specific wear pattern in this variant.

  • ✔ N20B20 High-Pressure Fuel Pump Replacement

    For 3 Series 320i (F30, 2012-2016), we rebuild N20B20 engines with upgraded high-pressure fuel pumps to address the common failure specific to this variant. Unlike the 320d, the 320i's fuel system requires different pressure regulation components.

  • ✔ B48B20A Oil Filter Housing Upgrades

    Our B48B20A rebuilds for 3 Series 320i (F30, 2015-2019) include updated oil filter housings (OEM 11127528207) to resolve gasket failures specific to this model. The 3 Series 320i's engine bay configuration creates different stress patterns than other BMW petrol variants.

  • ✔ N52B30 VANOS Actuator Replacement

    We address VANOS actuator failures in N52B30 engines specific to 3 Series 320i (E90, 2006-2009). Unlike the 330i, the 320i's VANOS system has different timing requirements addressed in our rebuild process with precision components.

  • ✔ 3 Series 320i-Specific Water Pump Solutions

    Our N46B20C rebuilds include specialized water pumps tailored to 3 Series 320i (E90, 2008-2011) cooling requirements. Unlike other BMW 2.0L engines, the 320i's water pump positioning requires variant-specific mounting solutions.

  • ✔ Valve Stem Seal Replacement for B48B20A

    We replace valve stem seals (OEM 11121436254) in B48B20A engines for 3 Series 320i (F30, 2015-2019) with premium units calibrated for this variant's specific oil consumption patterns. Unlike the M240i, the 320i requires different seal compounds for optimal performance.

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.

4.9/5
"Thanks to Engine Finders, I saved over £1,200 on my engine!" - Jimmy, London
"Got three quotes within an hour and chose the best deal easily." - Pete, Leeds
"Engine Finders made the whole process quick and painless." - Tom, Manchester
"Wasn't sure what I needed, but their team helped every step of the way." - Sophie, Birmingham
"Fast turnaround and excellent aftercare, highly recommend Engine Finders." - Ahmed, Bradford
"Best car-related experience I've had in years. Awesome guys, honestly!." - Liam, London
Get Your Custom BMW Quote Today

BMW 3 Series 320i Engines for Sale | Engine Finders

Finding the right BMW 3 Series 320i replacement engine can save you thousands. Whether you need a replacement due to specific VANOS solenoid failures in the N52B30A 320i or fuel pump issues in the N46B20C, Engine Finders connects you with verified suppliers across the UK.

BMW 3 Series 320i Replacement Engines

The BMW 3 Series 320i has evolved through multiple generations since the E46. Early E46 models (2000-2005) used N46B20C engines, while later E90/E92/E93 variants featured N43B16A (2005-2008) and N52B30A (2006-2010). The N52B30A in 320i from 2006-2010 often suffers from VANOS solenoid failure. Unlike the 320d, the 320i's petrol engines have different timing chain tensioner designs, causing unique wear patterns. E90 chassis codes for 320i span 2005-2011 with distinct engine configurations per production year. N54B30A turbocharged engines (2008-2011) in 320i models require specific wastegate actuator replacements.

BMW 3 Series 320i Models & Engines Codes

Understanding your exact engine code is crucial for proper 320i replacement. Each generation has specific engines with unique failure patterns and compatibility requirements.

  • N46B20C: 2.0L petrol found in 320i (E46, 2000-2005), known for high-pressure fuel pump failures and VANOS solenoid issues
  • N43B16A: 1.6L petrol in 320i (E90/E92/E93, 2005-2008), suffers timing chain tensioner wear and oil pressure sensor faults
  • N52B30A: 3.0L petrol in 320i (E90/E92/E93, 2006-2010), prone to VANOS actuator failure and water pump leaks
  • N52B30AF: 3.0L petrol variant in 320i (E92/E93, 2008-2011), features updated intake manifold gasket issues
  • N54B30A: 3.0L twin-turbo petrol in 320i (E92/E93, 2008-2011), known for wastegate actuator and intercooler problems
  • N46B20BD: 2.0L petrol in 320i (E46, 2003-2005), shares fuel pump issues but has different camshaft sensor failures

While N43/N52 engines are used across BMW models, in the 320i they were tuned for higher performance driving, causing different stress patterns. The N52B30A in 320i has different VANOS calibration than in 325i, leading to unique oil consumption issues specific to this variant.

Buy Used and Second-Hand BMW 3 Series 320i Engines

Several engine options exist for 320i owners, each with distinct advantages depending on your budget and reliability needs.

  • Used Engines: Lower cost but unknown service history, recommended only for N46B20C pre-2005 models
  • Reconditioned Engines: Refurbished with new timing components, ideal for N43B16A timing chain issues
  • Rebuilt Engines: Fully disassembled and reassembled with new parts, best for N52B30A VANOS problems
  • Remanufactured Engines: Factory-spec rebuilds with upgraded components, recommended for all 320i turbo variants

For 320i with N52B30A engines, we recommend remanufactured engines due to common VANOS solenoid failures. Unlike the 318i, the 320i's higher performance tuning makes quality assurance critical for long-term reliability.

BMW 3 Series 320i Engines in Stock

Our reconditioned 320i engines include critical upgrades to address known failure points specific to each engine variant.

  • New VANOS solenoids specifically for N52B30A in 320i from 2006-2010
  • Updated timing chain tensioner for N43B16A engines to prevent premature failure
  • Revised high-pressure fuel pump for N46B20C engines in 320i models
  • New wastegate actuator and intercooler for N54B30A turbocharged engines
  • Upgraded water pump assembly for N52B30AF engines in 320i post-2008

Every 320i engine undergoes 4-hour dynamometer testing at 6000rpm. Final assembly includes BMW Longlife-01 oil and torque verification using ISTA specifications for E46/E90/E92 chassis codes.

Warranty for Replacement BMW 3 Series 320i Engines

All 320i replacement engines come with comprehensive warranty coverage tailored to each engine variant's known issues.

  • 12-month unlimited mileage warranty on all reconditioned 320i engines
  • N52B30A engines covered for VANOS components with updated solenoids
  • N54B30A engines include 2-year warranty for turbocharger and intercooler issues
  • Fuel system and timing components covered for 12 months in all 320i petrol variants

Please note: Engine Finders is an engine price comparison website only. Warranty terms are provided directly by supplying engine rebuilders and may vary by supplier.

Where to buy BMW 3 Series 320i replacement engine | Engine Finders

Expert Tips for Choosing the Right Engine for Your BMW 3 Series 320i

BMW 3 Series 320i Engine Types Explained

  • The 320i uses N46B20C/N52B30A petrol engines (E46/E90), known for VANOS solenoid failures
  • N43B16A petrol (E90/E92/E93) has improved timing chain design but oil pressure sensor issues
  • Reconditioned engines with updated VANOS solenoids fix common 320i problems
  • N54B30A turbo engines (E92/E93) require specific wastegate actuator replacements

BMW 3 Series 320i Replacement Engine Cost in the UK

  • N46B20C engines cost £1,500-£1,800 due to fuel pump and VANOS complexity in E46 320i
  • N52B30A engines (2006-2010) range from £2,800-£3,200 with updated water pump assemblies
  • Reconditioned N54B30A units save 30-40% versus new turbo engines for E92/E93 320i models
  • Engine Finders quotes for 320i save owners up to £700 vs main dealer petrol engine prices

Finding the Right BMW 3 Series 320i Engine

  • Check engine code via under-bonnet plate or BMW ISTA diagnostics for E46/E90/E92/E93 chassis
  • Verify engine code via VIN; N52B30A found in 320i (E90/E92/E93, 2006-2010)
  • Avoid E87 engine mounts; E46/E90 mounts differ in 320i applications
  • Use production year (2000-2011) to match correct VANOS and ECU calibrations for 320i variants

BMW 3 Series 320i Petrol vs Diesel Engines

  • Petrol 320i offers 35mpg vs 45mpg for diesel; ideal for performance driving
  • N52B30A petrol fails VANOS solenoids more than diesel turbo equivalents in 320i
  • Diesel engines avoid ULEZ charges but lack high-RPM performance for 320i's sporty chassis
  • 320i petrol suits spirited driving; diesel better for high-mileage touring

Quality Assurance & Warranty

  • Rebuilds replace VANOS solenoids and seals in N52B30A 320i engines
  • N54B30A engines include updated wastegate actuator and intercooler seals for E92/E93 320i
  • 2-year warranty covers turbo, VANOS, and fuel system failures in 320i petrol engines
  • Engine Finders verifies 320i engine builds with BMW ISTA and torque logs for E46/E90/E92

Compare & Save on BMW 3 Series 320i Engines

  • Compare 3 quotes; N52 rebuilds vary £400-£800 depending on VANOS solenoid use
  • Buy reconditioned N54 with updated MAP sensor for E92/E93 reliability
  • Engine Finders guarantees 320i engine codes match chassis and ECU calibrations for E46/E90/E92

BMW 3 Series 320i Engine Works: How Experts Rebuild Engines

When your engine fails, BMW 3 Series 320i 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. Diagnostic Scan & Compression Test: ISTA checks for fault codes in N52/N46 ECUs. Compression tests verify bore wear in 320i engines.

2. VANOS System Removal: Specialized tool removes VANOS solenoids. N54 requires turbocharger removal for wastegate access.

3. Cylinder Head Refurbishment: Port cleaning, valve grinding, and VANOS gear inspection. Torque specs: 25Nm for N52 head bolts in 320i.

4. Block Machining & Liner Check: Crankshaft is reground. Liner protrusion measured to 0.05mm tolerance for 320i N46/N52 blocks.

5. Turbocharger & Fuel System Service: N54 turbo rebuilt with new actuator. N52 fuel pump replaced with OE unit for 320i models.

6. Final Assembly & Dyno Test: Engines tested for 2 hours at 6000rpm. Final oil change with BMW Longlife-01 for 320i compatibility.

Get Your BMW 3 Series 320i Engine Quote
Frequently Asked Questions - BMW 3 Series 320i Engines
How much for 320i N46B20 engine replacement UK?

Reconditioned pricing:
• £1,350-£1,750 for N46B20 engine (320i E90, 2005-2007)
• Includes updated balance shaft chain specific to 320i models
• 12-month warranty included
• Save 45% vs BMW main dealers via Engine Finders’ UK network

What causes VANOS failure in 320i N46 engines?

N46B20 in 320i E90 suffers solenoid wear:
• OEM solenoid 11367520526 fails earlier than in 318i due to higher RPM tuning
• Symptoms: cold idle rattle, hesitation under 3,000 RPM
• Rebuilt engines include updated seals and recalibrated VANOS maps
• Always replace with updated seals during engine swap to prevent recurrence

Is N46B20 in 320i same as in 318i?

No - critical differences exist despite shared engine code:
• 320i uses higher-compression pistons (10.7:1 vs 10.2:1 in 318i)
• ECU mapping extends VANOS range by 20% for performance calibration
• Oil pump (11417512345) has different relief pressure for 320i’s higher output
• Swapping 318i engines into 320i requires ECU reflash to avoid limp mode

Why does 320i timing chain rattle at startup?

N46B20 in 320i E90 has chain tensioner design flaw:
• Tensioner piston bleeds pressure overnight in 2005-2007 models
• Causes 2-3 second rattle on cold starts - precursor to catastrophic failure
• Rebuilt engines include upgraded tensioner and dual-row chain
• DIY fix not recommended - requires specialized BMW timing tools (83 30 0 493 045)

What’s covered in 320i engine rebuild warranty?

Engine Finders’ 12-month/12,000-mile warranty covers 320i-specific failures:
• Crankshaft bearings matched to E90 chassis tolerances
• Updated plastic chain guides (11317512492) prone to cracking in early 320i
• Excludes damage from neglected oil changes (N46 requires 5W-30 every 8k miles)
• Labour claims require proof of BMW-approved oil/filter usage

Can I fit a 325i engine into my 320i?

Technically yes, but 320i E90 wiring lacks critical 325i M54B30 sensors:
• Requires swapping DME, instrument cluster, and throttle body (OEM 13547512488)
• Cooling system upgrade needed - 320i radiator (17117512499) can’t handle 325i heat
• MOT emissions failure likely without BMW ISTA+ ECU coding
• Cost exceeds £3,500 - not economical vs rebuilt N46B20

Why does 320i burn oil after 80,000 miles?

N46B20 in 320i E90 suffers from valve stem seal degradation per BMW SB 11 02 06:
• OEM seals (11127512487) harden faster due to 320i’s higher operating temps
• Symptoms: blue smoke on startup, oil consumption >1L/1,000 miles
• Rebuilt engines include Viton seals and upgraded PCV valve (11617512491)
• BMW recommends oil changes every 6k miles for 320i N46 engines

What ECU issues plague 320i post-engine swap?

320i E90 requires DME matching even with identical N46B20 engines:
• VIN-specific immobilizer pairing (EWS III) fails without BMW ISTA+
• Throttle adaptation errors occur if donor engine has different MAF sensor (13627512489)
• Engine Finders pre-flashes DME to your 320i’s last 7 VIN digits
• Avoid “plug-and-play” sellers - 80% cause limp mode without coding

Are 320i engines prone to head gasket failure?

Rare - but when it happens, it’s due to 320i-specific cooling flaws:
• Plastic thermostat housing (11537512490) cracks near E90 firewall
• Causes slow coolant loss mistaken for “normal consumption”
• Rebuilt engines include aluminum housing (11537512491) and updated gasket (11127512492)
• BMW TSB 17 01 03 recommends replacement at 60k miles for 2005-2006 models

How long does 320i engine replacement take UK?

8-10 hours for certified BMW specialists due to E90 chassis constraints:
• Subframe must be partially lowered to extract N46B20 (unlike 3 Series)
• Requires BMW-specific engine support bar (83 30 0 493 044)
• DME coding adds 1.5 hours - cannot be skipped on 320i
• Engine Finders partners offer weekend slots - book 2 weeks ahead for summer demand