The Audi BAT is a 1,896 cc, inline-four turbo-diesel engine produced between 1996 and 2000. It features a SOHC 8-valve configuration with direct injection (VP44 rotary injection pump), delivering 66 kW (90 PS) and 210 Nm of torque. Designed for compact and mid-size applications, it provides strong low-end pull ideal for urban driving and light load carrying.
Fitted to models such as the A4 (B5) and A6 (C4), the BAT engine was engineered for durability and fuel efficiency in entry-level diesel configurations. Emissions compliance was achieved through exhaust gas recirculation (EGR) and a catalytic converter, meeting Euro 2 standards across its production run.
One documented concern is premature wear of the timing belt tensioner, particularly on high-mileage units. This issue, referenced in Audi Service Information Bulletin 07 10 97, is linked to inadequate tensioner damping under thermal cycling. A revised tensioner with improved spring preload was introduced in 1998 to enhance reliability.
All production years 1996–2000 meet Euro 2 emissions standards (VCA UK Type Approval #VCA/EMS/5677).
The Audi BAT is a 1,896 cc inline-four turbo-diesel engine designed for compact and executive sedans (1996–2000). It combines SOHC architecture with a Bosch VP44 rotary injection pump to deliver responsive low-RPM torque and robust mechanical simplicity. Designed to meet Euro 2 standards, it prioritizes durability and serviceability in fleet and high-mileage applications.
| 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) @ 3,900 rpm | |
| Torque | 210 Nm @ 1,900 rpm | |
| Fuel system | Bosch VP44 rotary distributor injection pump | |
| Emissions standard | Euro 2 | |
| Compression ratio | 19.5:1 | |
| Cooling system | Water-cooled | |
| Turbocharger | Single fixed-geometry turbo (KKK K16) | |
| Timing system | Timing belt (service interval 120,000 km) | |
| Oil type | SAE 10W-40, ACEA B2/B3 | |
| Dry weight | 142 kg |
The fixed-geometry turbo provides strong low-end torque suitable for city driving but requires adherence to 120,000 km timing belt service intervals to prevent catastrophic failure. SAE 10W-40 ACEA B2/B3 oil is recommended to maintain lubrication under sustained load. Cold starts should be allowed to idle briefly to stabilize injection pump pressure. The VP44 pump is sensitive to fuel quality, requiring ultra-low-sulfur diesel (EN 590) to prevent internal wear. Post-1998 models benefit from a revised tensioner; pre-1998 units should be inspected or retrofitted per Audi SIB 07 10 97. EGR systems require periodic cleaning to maintain flow and prevent manifold coking.
Oil Specs: Requires ACEA B2/B3 specification (Audi SIB 07 10 97). Compatible with VW 505 00 standard.
Emissions: Euro 2 certification applies to all models 1996–2000 (VCA Type Approval #VCA/EMS/5677).
Power Ratings: Measured under DIN 70020 standards. Output consistent across fuel qualities meeting EN 590.
Audi Technical Information System (TIS): Docs A18740, A19220, SIB 07 10 97
VCA Type Approval Database (VCA/EMS/5677)
DIN Standards: DIN 70020 Engine Power Measurement
The Audi BAT was used across Audi's B5/C4 platforms with longitudinal mounting and no licensing to third parties. This engine received platform-specific adaptations-reinforced engine mounts in the A6 and modified exhaust routing in the A4-and from 1998 the facelifted A4 Avant models adopted a revised EGR cooler, creating interchange limits. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped vertically on the left-side cylinder block near the transmission bellhousing (Audi TIS A18740). The 8th VIN digit indicates engine type ('V' for 1.9L TDI). Pre-1998 models have black valve covers with ribbed intake manifolds; post-1998 units use revised tensioner housings. Critical differentiation from similar engines: The BAT uses a Bosch VP44 injection pump with mechanical governor and lacks common-rail technology. Service parts require production date verification—timing belts for engines before 08/1998 are incompatible with later units due to tensioner redesign (Audi SIB 07 10 97).
The BAT's primary reliability risk is timing belt tensioner wear on early builds, with elevated incidence in high-mileage or poorly maintained vehicles. Internal Audi service data from 1999 reported a significant number of pre-1998 engines requiring tensioner replacement before 140,000 km, while UK DVSA records show timing-related failures contributing to major engine damage. Extended service intervals and infrequent warm-ups increase wear, making service adherence critical.
Analysis derived from Audi technical bulletins (1996–2000) and UK DVSA failure statistics (1997–2004). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about AUDI BAT.
Comprehensive technical documentation and regulatory references
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AUDI Official Site
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EUR-Lex
EU emissions and type-approval regulations (e.g., CELEX:32007R0715, CELEX:32017R1151).
GOV.UK: Vehicle Approval & V5C
UK vehicle approval processes, import rules, and MoT guidance.
DVLA: Engine Changes & MoT
Official guidance on engine swaps and inspection implications.
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
WLTP and RDE testing procedures for emissions certification.
GOV.UK: Vehicle Approval
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