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BMW M62B46 Engine - Replacement Cost, Problems & CompatibilityProblems & Compatibility
The 4.6-litre naturally aspirated V8 that powered the BMW X5 4.6is from 2001-2003, with reconditioned units from £3,500 and a dedicated enthusiast following for this high-revving, high-torque SUV motor.
Supply & Fit Available
12-Month Warranty
Nationwide Delivery
100+ Suppliers
Used from
£2,000
Reconditioned from
£3,500
Rebuilt from
£5,000
GB
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Key Specs
BMW M62B46 - Specifications at a Glance
Engine Code
M62B46 (Family includes M62B46 and M62B46TU)
Fuel
Petrol
Configuration
4.6L naturally aspirated V8, 90° bank angle, DOHC, 4 valves per cylinder, double VANOS (variable cam timing), aluminium block and heads
Power Output(s)
340-347 hp (250-258 kW), 480 Nm torque - M62B46: 347 hp; M62B46TU: 340 hp (emissions-tuned)
Years Produced
2001-2003
UK Models Fitted
BMW X5 (E53) 4.6is - see full list in Compatibility below
2025 UK Replacement Requests
Data not available - engine is rare; estimated under 50 requests annually
Replaced
M62B44
Replaced By
N62B48 (4.8L V8)
Most Common Failure
Timing chain guide wear; VANOS seal degradation
Reconditioned Price Range
£3,500-£5,500 supply-only
Vetted UK specialists for M62B46 replacements
Minimum 12-month warranty on reconditioned and rebuilt options
Fitted To
Which BMW Models Use the M62B46-
TAG: Fitted To
| Model | Generation/Chassis | Badge(s) | Years | Link |
|---|---|---|---|---|
 BMW X5 | E53 (pre-facelift) | 4.6is | 2001-2003 |
CROSS-BRAND
M62B46 is documented across 1 BMW applications spanning BMW X5. Registration lookup confirms the exact suffix before quotes are sent.
Not sure which engine your car has?
Not sure which V8 your X5 has- Enter your registration above - we'll confirm your exact M62B46 fitment before any quotes are sent.
Prices
BMW M62B46 Engine Replacement Cost (UK)
Condition | Supply Only | Fitted (Independent Specialist) | Typical Warranty |
|---|---|---|---|
Used | £2,000-£3,500 | £2,650-£4,360 | 3-6 months |
Reconditioned | £3,500-£5,500 | £4,150-£6,360 | 12-24 months |
Rebuilt | £5,000-£7,500 | £5,650-£8,360 | 12-24 months |
All prices are as M62B46 data is not in the proprietary file. Fitted = supply price + 12-16 hours at £65/hr independent labour.
Labour Guide
Fitting an M62B46 typically takes 12-16 hours at £65-£85/hr (independent BMW specialist) - the V8 layout and double VANOS add complexity.
Price Factors
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Common Problems
BMW M62B46 Engine Problems - What Actually Fails
Every engine has its weak points. Here are the known issues with the M62B46, based on real-world data and verified failure patterns.
Verified issue focus: Timing chain guide wear; VANOS seal degradation.
1. Timing Chain Guide Wear - catastrophic if ignored
1. Timing Chain Guide Wear - catastrophic if ignored
Typical onset:
60,000-120,000 miles
What happens:
The M62B46 uses plastic timing chain guides that become brittle with age and heat cycling. When they fail, the chain can slip or break, causing piston-to-valve contact - the engine is destroyed. Symptoms include a rattling noise on cold start and a check engine light for timing deviations.
Repair vs replace:
If caught before the chain jumps, replacing the guides, tensioner, and chain is a labour-intensive but standalone fix (typically £2,000-£3,500). If the chain has already jumped, the engine is unrebuildable - a replacement unit is required.
Read more about this issue
2. VANOS Seal Degradation - loss of low-end torque
2. VANOS Seal Degradation - loss of low-end torque
Typical onset:
50,000-100,000 miles
What happens:
The M62B46’s double VANOS system uses rubber seals that harden and fail over time, leading to poor camshaft adjustment. Symptoms include rough idle, loss of low-end torque, and reduced fuel economy - the engine feels “flat” below 3,000 rpm.
Repair vs replace:
VANOS seal replacement is a standalone repair (aftermarket Viton seals are widely available) costing £800-£1,500. If ignored, it may cause camshaft timing issues and, in extreme cases, timing chain damage.
Read more about this issue
3. Coolant Leaks - valley pan gasket and water pump
3. Coolant Leaks - valley pan gasket and water pump
Typical onset:
60,000-100,000 miles
What happens:
The M62’s aluminium block and plastic coolant components degrade over time. The valley pan gasket (under the intake manifold) is a common leak point, as is the water pump. Coolant loss can lead to overheating and head gasket failure.
Repair vs replace:
Valley pan gasket replacement is a labour-intensive job (intake off) but standalone; water pump replacement is simpler. Preventative replacement of these items at 80k miles is recommended.
Read more about this issue
Compare rebuilt M62B46 prices with the failures already addressed
Engine Variants
M62B46 Sub-Codes Explained - Which One Is in Your Car-
The M62B46 engine family includes two main revisions: the standard M62B46 (found in the X5 4.6is) and the M62B46TU (Technical Update) which was used in some later production X5s and the Alpina X5. The differences are primarily in emissions calibration and slight power variations. - Fitted to: BMW X5 E53 4.6is (pre-facelift), 2001-2002 - Key technical difference: Standard double VANOS, 347 hp (258 kW), 480 Nm torque, 10.5:1 compression, Euro 3 emissions. - Sub-code-specific failure note: Shares the M62 family failure pattern above - timing chain guides and VANOS seals are the primary concerns. - Interchange note: Directly swappable with M62B46TU (with ECU reflash), but not with M62B44 or M62B35 - the bore/stroke and tuning differ. - Fitted to: BMW X5 E53 4.6is (late 2002-2003), Alpina X5 4.6 (rare) - Key technical difference: Updated emissions calibration for Euro 4, slightly lower output (340 hp, 253 kW) due to tighter lambda targets; same displacement and compression ratio. - Sub-code-specific failure note: Shares the same failure patterns as the standard M62B46; no unique failure modes reported.
Not sure which version your X5 has- Enter your registration above - we'll confirm your exact M62B46 fitment before any quotes are sent.
Easily Confused
M62B44
the 4.4-litre V8 that preceded the M62B46 in BMW's lineup, found in the E39 540i, E38 740i, and earlier E53 X5 4.4i. The M62B46 is essentially a bored-out and stroked version of the M62B44 with revised tuning, producing significantly more power. [M62B44 Engine - /bmw/m62b44-engine/]
Alternative / Next-Gen Code
N62B48
BMW's next-generation 4.8-litre V8, found in the later E53 X5 4.8is, E60 550i, E65 750i, and other models. The N62 introduced Valvetronic and a new engine management system, but is more complex and less DIY-friendly than the M62 family. [N62B48 Engine - /bmw/n62b48-engine/]
Related JLR Variants
M62B35
the 3.5-litre V8 variant, found in the E39 535i and some E38 735i models. It's the smaller displacement sibling of the M62B46, sharing the same architecture but with different bore/stroke and tuning. [M62B35 Engine - /bmw/m62b35-engine/]
Confirm the exact M62B46 fitment
Not sure which version your X5 has- Enter your registration above - we'll confirm your exact M62B46 fitment before any quotes are sent.
Buying Guide
Buying a Replacement M62B46 - 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 M62B46 makes sense for an X5 where a reconditioned unit would exceed the vehicle's value. However, any used M62B46 is now over 20 years old - only buy with documented timing chain and VANOS work. A used unit without history is a gamble; budget for immediate preventative work. Used engines
Reconditioned:
A proper M62B46 recon addresses the engine's known weaknesses: new timing chain guides, tensioner, VANOS seals, valley pan gasket, water pump, and thermostat. This is the right call for owners who want reliability and performance - the M62B46 is a classic V8 that, when properly refreshed, delivers a driving experience that justifies the investment. Expect £3,500-£5,500 with 12-24 months warranty. Reconditioned engines
Rebuilt:
A full M62B46 rebuild is rarely justified unless the engine has suffered catastrophic failure (dropped valve, broken chain) and the owner wants to preserve the original block. A rebuild with forged pistons, upgraded bearings, and ported heads is an enthusiast option, but costs quickly exceed the vehicle's value. Rebuilt engines
Supply & Fit Line:
Our vetted UK BMW specialists offer supply-only or full supply-and-fit - 12-month warranty on reconditioned units, nationwide delivery. Supply and fit
Vehicle Value Note:
The M62B46 only appeared in the E53 X5 4.6is, now worth £4,000-£10,000 depending on condition. A reconditioned M62B46 at £3,500-£5,500 represents 35-60% of vehicle value - a significant investment. For a high-mileage X5 worth under £5,000, a used unit with documented history may be the only sensible option. Evaluate the car's body and chassis condition before committing - these X5s are now classics, and condition is everything.
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Related Engines
Engines Related to the BMW M62B46
Explore engines that are closely related to the BMW M62B46, including its predecessor, successor, and key family variants.
Predecessor
M62B44
the 4.4-litre V8 that preceded the M62B46 in BMW's lineup, found in the E39 540i, E38 740i, and earlier E53 X5 4.4i. The M62B46 is essentially a bored-out and stroked version of the M62B44 with revised tuning, producing significantly more power. [M62B44 Engine - /bmw/m62b44-engine/]
Successor
N62B48
BMW's next-generation 4.8-litre V8, found in the later E53 X5 4.8is, E60 550i, E65 750i, and other models. The N62 introduced Valvetronic and a new engine management system, but is more complex and less DIY-friendly than the M62 family. [N62B48 Engine - /bmw/n62b48-engine/]
Sibling
M62B35
the 3.5-litre V8 variant, found in the E39 535i and some E38 735i models. It's the smaller displacement sibling of the M62B46, sharing the same architecture but with different bore/stroke and tuning. [M62B35 Engine - /bmw/m62b35-engine/]
Sibling
M62B44
the more common 4.4-litre variant. While the M62B46 was a low-production engine, the M62B44 powered many more BMWs, making it the page that most M62 owners will be looking for. [M62B44 Engine - /bmw/m62b44-engine/]
Cross-Brand Twin
The M62B46 is BMW-exclusive and was not shared with any other manufacturer
the M62 family was BMW's flagship V8 before the N62 and S62 engines.
FAQ
BMW M62B46Frequently Asked Questions
Question 1How much does an M62B46 engine replacement cost in the UK-
A reconditioned M62B46 supply-only is estimated at £3,500-£5,500, with fitted prices from £4,150 to £6,360 depending on labour and parts. Used units cost £2,000-£3,500 but all are now over 20 years old. Rebuilt units may exceed £5,000-£7,500. Warranty is typically 12-24 months on reconditioned/rebuilt units.
- Used units cost £2,000-£3,500 but all are now over 20 years old.
- Rebuilt units may exceed £5,000-£7,500.
- Warranty is typically 12-24 months on reconditioned/rebuilt units.
Question 2What are the common problems with the M62B46 engine-
The most documented failures are timing chain guide wear (catastrophic if ignored) and VANOS seal degradation (loss of torque, rough idle). Timing chain guide failure destroys the engine if not addressed. VANOS seals harden with age, causing poor camshaft adjustment. Cooling system leaks (valley pan gasket, water pump) are also common.
- Timing chain guide failure destroys the engine if not addressed.
- VANOS seals harden with age, causing poor camshaft adjustment.
- Cooling system leaks (valley pan gasket, water pump) are also common.
Question 3Which BMW models have the M62B46 engine-
The M62B46 was exclusively fitted to the BMW X5 E53 4.6is from 2001-2003. A small number of Alpina X5 4.6s also used a modified version. It was not used in any other BMW model.
- A small number of Alpina X5 4.6s also used a modified version.
- It was not used in any other BMW model.
Question 4Should I buy a used or reconditioned M62B46-
A reconditioned M62B46 is the safer choice because it addresses the engine's known weak points (timing chain guides, VANOS seals, cooling system) and comes with a warranty. Used units are much cheaper but will almost certainly require timing chain and VANOS work. Given the age of all M62B46s, reconditioning is recommended for reliability.
- Used units are much cheaper but will almost certainly require timing chain and VANOS work.
- Given the age of all M62B46s, reconditioning is recommended for reliability.
Question 5How do I know if my X5 has the M62B46 and not another M62 variant-
The engine code is stamped on the block (front left side) and listed on your V5C or via a BMW VIN decoder. The M62B46 is specific to the X5 4.6is - check your X5's VIN (VIN 7th-8th characters identify the engine). If your X5 has '4.6is' badges, it has the M62B46 (or rare Alpina variant).
- The M62B46 is specific to the X5 4.6is - check your X5's VIN (VIN 7th-8th characters identify the engine).
- If your X5 has "4.6is" badges, it has the M62B46 (or rare Alpina variant).
Question 6Is the M62B46 a reliable engine-
The M62B46 is a robust V8 when properly maintained, but all examples are now over 20 years old - reliability depends entirely on maintenance history. Timing chain guides and VANOS seals are the main weak points. A well-maintained M62B46 with documented chain and VANOS work can exceed 150,000 miles. Neglected engines are expensive to restore.
- Timing chain guides and VANOS seals are the main weak points.
- A well-maintained M62B46 with documented chain and VANOS work can exceed 150,000 miles.
- Neglected engines are expensive to restore.
Compare BMW M62B46 Engine Prices Today
Vetted UK BMW V8 specialists who work on the M62B46 and its M62 family every week Minimum 12-month warranty on every reconditioned and rebuilt M62B46 Nationwide delivery - supply-only or full supply & fit No-obligation comparison tailored to your exact engine code and sub-code. Enter your registration and we'll confirm your M62B46 fitment before any quotes are sent. With reconditioned M62B46 units from around £3,500, comparing takes two minutes - and given the age and rarity of this engine, finding the right specialist is essential.
Vetted UK Specialists
Vetted UK specialists for M62B46 replacements
Minimum 12-Month Warranty
Minimum 12-month warranty on reconditioned and rebuilt options
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