The Audi HX is a 2,496 cc, inline — five turbocharged petrol engine produced between 2022 and 2023. It features direct fuel injection (TFSI), variable valve timing, and dual overhead camshafts (DOHC). In standard tune it delivers 220 kW (300 PS) and 450 Nm of torque, with overboost capability increasing output to 500 Nm under load.
Fitted to models such as the RS3 (8Y) and TT RS (8S), the HX engine was engineered for high — performance driving dynamics and track capability. It i…
All HX engines comply with Euro 6d-ISC standards .
The Audi HX is a 2,496 cc inline-five turbocharged petrol engine engineered for high-performance models (2022–2023). It combines TFSI direct injection with a 48V mild-hybrid system to deliver rapid acceleration and enhanced drivability. Designed to meet Euro 6d-ISC standards, it balances track-ready performance with emissions compliance.
| Parameter | Value | Source |
|---|---|---|
Displacement | 2,496 cc | |
Fuel type | Petrol | |
Configuration | Inline-5, DOHC, 20-valve | |
Aspiration | Turbocharged | |
Bore × stroke | 82.5 mm × 92.8 mm | |
Power output | 220 kW (300 PS) @ 5,600–7,000 rpm (235 kW overboost) | |
Torque | 450 Nm @ 2,250–5,600 rpm (500 Nm overboost) | |
Fuel system | Bosch HDEV6 direct injection (up to 350 bar) | |
Emissions standard | Euro 6d-ISC | |
Compression ratio | 10.5:1 | |
Cooling system | Water-cooled with dual-circuit thermostat | |
Turbocharger | Single-scroll turbocharger with anti-lag system (Garrett) | |
Timing system | Chain-driven (double-row, front-mounted) | |
Oil type | Refer to vehicle handbook / manufacturer specification | |
Dry weight | 184 kg |
The Audi HX was used across Audi's MQB Evo platform with transverse mounting. This engine received platform-specific adaptations—reinforced engine mounts in the RS3 and revised intake manifolds in the TT RS—and from 2023 the updated turbo cooling and calibration introduced minor interchange limits. All adaptations are documented in OEM technical bulletins.
Engine Finders UK Ltd, which operates EngineCode.uk, can pass your enquiry to engine suppliers in the UK. The service is for vehicles in the United Kingdom, with UK delivery or fitting. This is a commercially connected service, and sending an enquiry does not confirm diagnosis or compatibility.
Diagnostic reminder: If a technician has recommended replacing the engine, you can send an enquiry to engine suppliers in the UK. Confirm the diagnosis first: an engine-code record does not diagnose a fault.
Field reports and technical service bulletins highlight component wear patterns under high-load operation. Adherence to manufacturer service intervals and approved fluid specifications is critical for long-term reliability.
Analysis derived from manufacturer technical service bulletins and industry workshop records. 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 HX is generally robust when maintained properly, but models frequently operated under high-load conditions without cooldown are prone to turbocharger failure. Later units (post-2023) show improved turbo durability. Regular servicing with Audi Longlife-2018 oil, adherence to 15,000 km service intervals, and allowing engine cooldown after spirited driving significantly extend service life beyond 150,000 km.
The most frequent issues are turbocharger bearing wear due to lack of cooldown, 48V mild-hybrid system faults, timing chain tensioner wear, and oil leaks from the valve cover. These are documented in Audi service bulletins and are largely preventable with proper maintenance. The anti-lag system and BSG unit may require attention in high-mileage performance vehicles.
The HX engine was used in the RS3 (8Y) and TT RS (8S) from 2022 to 2023. It appears in 2.5 TFSI variants. All units are equipped with 48V mild-hybrid technology for improved throttle response and torque fill, complying with Euro 6d-ISC emissions standards.
Aftermarket ECU tuning is common on the HX platform, but increasing boost or altering engine parameters accelerates component wear, impacts emissions compliance, and may void vehicle warranties. Any modifications should be evaluated carefully by a qualified specialist.
In real-world conditions, the HX achieves 9.8–11.5 L/100km (24–29 mpg UK) on mixed driving. Highway efficiency can reach ~8.5 L/100km (~33 mpg UK). The 48V MHEV system improves stop-start efficiency and torque fill, reducing consumption in urban driving by up to 0.8 L/100km compared to non-hybrid equivalents.
Yes, the HX is an interference engine. If the timing chain fails or skips, piston-to-valve contact can occur, resulting in severe internal damage. The front-mounted chain is generally durable, but adherence to oil change intervals is critical to ensure proper lubrication and tensioner function.
Audi specifies SAE 5W-40 oil meeting Longlife-2018 (or newer) standards. This low-SAPS formulation is essential for protecting the turbocharger, timing chain, and 48V hybrid components. Oil changes should be performed every 15,000 km or annually, whichever comes first, to maintain engine longevity and hybrid system functionality.
Comprehensive technical documentation and regulatory references
EngineCode.uk is operated by Engine Finders UK Ltd. It provides engine-reference information and an optional commercial enquiry service. It is not an official manufacturer website. Check the record's sources and confirm vehicle-specific details before relying on it for parts, repairs or replacement.
Our editorial standard prioritises relevant manufacturer documentation and official regulatory sources. The sources and verification status for a record should be checked alongside the data.
A statement is not verified merely because a source is listed. Where supporting evidence is missing or conflicting, the record should identify that limitation. Please report unsupported or inconsistent information.
Transparency in gaps
A missing or unverified value does not mean the manufacturer has withheld it. We distinguish information not yet verified, information not available to us, and information explicitly not disclosed by the source.
Regulatory Stability
EU regulations are referenced using CELEX identifiers for long-term stability.
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)
UK type-approval authority for automotive products.
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
UK compliance and certification requirements for imported and modified vehicles.
VCA Certification Portal
Type-approval guidance and documentation.
Records are subject to review and correction. Source links, dates and verification notes should be read with the technical information. Our Editorial and Sourcing Policy explains our standards and review process.
Found an error or missing source? Report a problem with this page. Include the field or statement concerned and a supporting source if available. You can also email corrections@enginecode.uk.
Copyright and permissions
Images and other material may be protected by copyright. Attribution does not by itself grant permission to reuse material. If you believe material on this site infringes your rights, contact copyrights@enginecode.uk with the page URL and details of your claim. We will review the material and take appropriate action.
Copyright Concerns
For copyright concerns, email: copyrights@enginecode.uk
Our Privacy Policy explains how Engine Finders UK Ltd uses information from visits, vehicle lookups, enquiries and messages. Our Cookie Policy explains cookies and similar technologies and how to change your choices.
For access, correction, or deletion requests, email: gdpr@enginecode.uk
Trademark Notice
All trademarks, logos, and engine codes are the property of their respective owners. Use on this site is strictly for reference and identification.
Ownership and commercial services
EngineCode.uk is owned and operated by Engine Finders UK Ltd. Alongside our reference content, we offer an optional replacement-engine enquiry service through Engine Finders and may identify relevant services provided by businesses connected with us. These commercial connections are disclosed. Using an enquiry service is not required to read our reference content.
Engine Finders UK Ltd operates this website. Our optional enquiry service has a commercial purpose. Our Ownership and Commercial Disclosure explains the relationship between the reference website and that service. Participating suppliers pay a fee or subscription to participate on the network and receive quote requests.
Use this record as a starting point for identification. Specifications and vehicle applications may contain errors or omissions. Confirm the exact engine variant and compatibility using vehicle-specific documentation and a qualified supplier or technician.
All external links open in new tabs. Please verify current availability of resources.