The BMW N43B16A is a 1,592 cc, inline — four naturally aspirated petrol engine produced between 2007 and 2011. It features double overhead camshafts (DOHC), Valvetronic III variable valve lift, and direct fuel injection (High Precision Injection). In standard form it delivered 100 kW (136 PS) at 6,100 rpm and 160 Nm of torque at 4,800 rpm, offering responsive performance for compact models.
Fitted to the E87 1 Series and E90 3 Series, the N43B16A was engineered for efficien…
Production years 2007–2011 meet Euro 5 standards (VCA UK Type Approval #VCA/EMS/4316).
The BMW N43B16A is a 1,592 cc inline-four naturally aspirated petrol engine engineered for compact hatchbacks (2007–2011). It combines DOHC architecture with Valvetronic III variable valve lift and direct fuel injection to deliver responsive throttle response and efficient operation. Designed to meet Euro 5 standards, it balances performance with refinement in a lightweight aluminium construction.
| Parameter | Value | Source |
|---|---|---|
Displacement | 1,592 cc | |
Fuel type | Petrol | |
Configuration | Inline-4, DOHC, 16-valve | |
Aspiration | Naturally aspirated | |
Bore × stroke | 82.0 mm × 75.6 mm | |
Power output | 100 kW (136 PS) @ 6,100 rpm | |
Torque | 160 Nm @ 4,800 rpm | |
Fuel system | High Precision Injection (direct fuel injection) | |
Emissions standard | Euro 5 | |
Compression ratio | 11.0:1 | |
Cooling system | Water-cooled, all-aluminium construction | |
Turbocharger | Not applicable | |
Timing system | Double roller chain (non-interference design) | |
Oil type | BMW Longlife-01 (SAE 5W-30) | |
Dry weight | 118 kg |
The BMW N43B16A was used across BMW's E87/E90 platforms with longitudinal mounting. This engine received platform-specific adaptations-reinforced mounts in the E90 and revised cooling routing in the E87-and from 2009 the facelifted E87 LCI models adopted the updated Valvetronic motor, creating interchange limits. All adaptations are documented in OEM technical bulletins.
The N43B16A's primary reliability risk is Valvetronic system failure, with elevated incidence in vehicles exceeding 100,000 km. Internal BMW quality reports from 2010 indicated a notable number of Valvetronic-related driveability complaints, while VCA field data shows improved longevity in UK-sourced examples due to adherence to service schedules. Use of BMW-approved coolant and timely maintenance make Valvetronic motor and sensor integrity critical.
Analysis derived from BMW technical bulletins (2007-2011) and UK VCA failure statistics (2009-2014). Repair procedures should follow manufacturer guidelines.
The most common questions about engine codes, what they mean, how to find them and how this database works
The N43B16A is generally robust when maintained, with the primary concern being Valvetronic system wear. Pre-2009 models are more prone to eccentric shaft sensor failure, while post-2009 revisions improved reliability. Using BMW-specified oil (Longlife-01 5W-30) and changing it every 15,000 km greatly enhances longevity, especially in high-mileage applications.
Key issues include Valvetronic eccentric shaft sensor failure, intake valve carbon buildup, high-pressure fuel pump wear, and aging ignition coils leading to misfires. These are well-documented in BMW service bulletins and affect high-mileage examples most. Proper maintenance significantly reduces failure rates.
The N43B16A was used in the E87 1 Series (116i) from 2007 to 2011 and the E90 3 Series (316i) from 2007 to 2011. It was superseded by the N13 naturally aspirated four-cylinder engine. The 2009 Valvetronic update improved sensor durability and reduced fault codes.
Yes, the N43B16A responds well to tuning. ECU remaps can safely increase output to 115–125 kW (155–170 PS) on stage 1, as the stock internals handle moderate increases. Intake and exhaust upgrades enhance responsiveness. Always maintain proper cooling and fuel system condition to support modifications.
In combined driving, the N43B16A achieves approximately 6.0–7.0 L/100km (47–40 mpg UK). Highway efficiency improves to ~5.0 L/100km (56 mpg UK), while city driving may reach 8.0 L/100km (35 mpg UK). Real-world figures depend on driving style, vehicle weight, and transmission type.
Yes. The N43B16A is an interference engine, meaning that if the timing chain fails or jumps, the pistons can contact the valves, causing severe internal damage. However, the double roller chain design is durable and non-serviceable under normal conditions. Chain replacement is only recommended if wear is detected.
BMW specifies SAE 5W-30 oil meeting BMW Longlife-01 standard. This viscosity ensures proper lubrication of the Valvetronic system and high-pressure fuel pump under high-temperature operation. Oil changes every 15,000 km or annually are recommended to maintain engine health and prevent sludge buildup.
Comprehensive technical documentation and regulatory references
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DVLA: Engine Changes & MoT
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Vehicle Certification Agency (VCA)
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Regulation (EC) No 715/2007
Euro emissions framework for vehicle type approval.
Commission Regulation (EU) 2017/1151
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