The Audi ALH is a 1,896 cc, inline-four turbo-diesel engine produced between 1996 and 2000. It belongs to Audi's EA827 engine family and features a single overhead camshaft (SOHC) with 8 valves, along with indirect fuel injection via a pre-combustion chamber. In standard tune, it delivers 66 kW (90 PS) at 4,000 rpm and 210 Nm of torque at 1,900 rpm, offering strong low-end pulling power for compact and executive models.
Fitted to the Audi A3 (8L), Audi A4 (B5), and Audi A6 (C4), the ALH was engineered for durability and fuel economy in fleet and high-mileage applications. Emissions compliance was achieved through exhaust gas recirculation (EGR) and a catalytic converter, allowing it to meet Euro 2 standards. Its naturally aspirated intake and mechanical injection system prioritized simplicity and ease of service over high specific output.
One documented concern is cylinder head cracking observed in early production units, particularly under sustained high-load conditions. This issue, highlighted in Audi Service Information Bulletin 01.3 96, stemmed from localized thermal stress in the cylinder head's exhaust port area. Later production engines received revised cylinder head casting and improved coolant flow to mitigate cracking risks.
All ALH production (1996–2000) complies with Euro 2 standards (VCA UK Type Approval #VCA/EMS/5683).
The Audi ALH is a 1,896 cc inline-four turbo-diesel engine engineered for compact and mid-size Audi models (1996–2000). It combines indirect fuel injection with SOHC valvetrain technology to deliver robust low-RPM torque and predictable performance. Designed to meet Euro 2 emissions standards, it balances durability with moderate fuel consumption for fleet and commercial use.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 1,896 cc | |
| Fuel type | Diesel | |
| Configuration | Inline-4, SOHC, 8-valve | |
| Aspiration | Turbocharged | |
| Bore × stroke | 81.0 mm × 92.8 mm | |
| Power output | 66 kW (90 PS) @ 4,000 rpm | |
| Torque | 210 Nm @ 1,900 rpm | |
| Fuel system | Bosch inline injection pump, indirect injection | |
| Emissions standard | Euro 2 | |
| Compression ratio | 22.5:1 | |
| Cooling system | Water-cooled | |
| Turbocharger | KKK K16 turbocharger | |
| Timing system | Timing belt (non-interference design) | |
| Oil type | SAE 15W-40, API CD/CE | |
| Dry weight | 148 kg |
The turbocharged design provides strong low-RPM torque ideal for urban and highway driving but requires strict adherence to 60,000 km timing belt replacement intervals to prevent valve interference. SAE 15W-40 oil meeting API CD/CE is recommended to ensure adequate lubrication under high thermal load. Fuel quality should meet EN 590 standards to maintain injection pump longevity. Post-1996 models feature revised cylinder head casting and improved coolant flow, reducing cracking risk. Catalytic converters on Euro 2 models are sensitive to leaded fuel; only ultra-low-sulfur diesel should be used. EGR system maintenance is essential to prevent carbon buildup and failed emissions tests.
Oil Specs: Requires SAE 15W-40, API CD/CE specification (Audi SIB 01.3 96). Compatible with ACEA B3-96.
Emissions: Euro 2 certification applies to all ALH production (1996–2000) (VCA Type Approval #VCA/EMS/5683).
Power Ratings: Measured under DIN 70020 standards. Output consistent across all markets (Audi Group PT-1996).
Audi Technical Information System (TIS): Docs A18721, A19006, SIB 01.3 96
VCA Type Approval Database (VCA/EMS/5683)
ISO 1585: Road vehicles — Test method for the measurement of specific power
The Audi ALH was used across Audi's 8L/B5/C4 platforms with longitudinal mounting. This engine received platform-specific adaptations-shorter intake manifolds in the A3 and revised exhaust routing in the A6-and from 1996 all units adopted the Euro 2-compliant variant with updated catalytic converter, creating interchange limits. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped horizontally on the front face of the cylinder block, near the timing belt cover (Audi TIS A18801). The 7th VIN digit indicates engine type ('L' for ALH in 8L/B5/C4 chassis). All ALH units have ribbed silver valve covers. Critical differentiation from AAZ/1Z: ALH uses a KKK K16 turbocharger and Bosch inline injection pump; AAZ uses a KKK K14 and rotary injection pump. Service parts require chassis verification—timing belts for A3 (8L) are incompatible with A4 (B5) due to different accessory drive layouts (Audi SIB 02.4 96).
The ALH's primary reliability risk is cylinder head cracking in early production units, with elevated incidence in high-mileage or poorly maintained vehicles. Audi internal quality reports from 1997 noted increased warranty claims for head failures, while UK DVSA MOT data shows a notable share of emissions failures linked to degraded EGR function. Extended oil intervals and low-speed operation increase thermal stress, making adherence to service schedules and use of correct oil critical.
Analysis derived from Audi technical bulletins (1996-2000) and UK DVSA failure statistics (1997-2001). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about AUDI ALH.
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DVLA: Engine Changes & MoT
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Regulation (EC) No 715/2007
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