What Turbo Is in a 2011 Audi A4?
The 2011 Audi A4 2.0T uses a BorgWarner turbocharger on its 2.0-liter TFSI inline‑four engine, commonly referenced as a K03-type unit, though exact part numbers vary by engine code, market, and drivetrain. In practice, all stock 2011 A4 2.0T models come with a small, fast‑spooling single-scroll turbo designed for efficiency and low‑rpm torque rather than maximum power.
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Understanding the 2011 Audi A4 Engine and Turbo Setup
The 2011 Audi A4 (B8 generation, pre-facelift) is best known in many markets—especially North America—for the 2.0-liter TFSI engine, designated EA888 Gen 2. This engine is factory‑turbocharged, and the turbo specification is tied closely to the exact engine code and drivetrain configuration.
The Core Engine: 2.0 TFSI EA888 Gen 2
For model year 2011, the mainstream A4 2.0T uses the EA888 second-generation engine. In most markets, this engine produces around 155–155 kW (approximately 208–211 hp) and about 258 lb‑ft (350 Nm) of torque, depending on region and emissions calibration. This torque figure is achieved largely thanks to the relatively small turbocharger, which is designed to build boost quickly at low and mid-range RPM.
Turbocharger Type and Supplier
While Audi does not market the car by the turbo model name, supplier information and parts catalog data indicate that the 2011 A4 2.0T uses a BorgWarner turbocharger. It is typically categorized as a K03-style single‑scroll turbo, integrated with the exhaust manifold in a compact housing. Some technical documentation and enthusiast resources refer to it as a BorgWarner K03 (or K03 derivative) specifically designed for the EA888 series.
Key Turbo Details for the 2011 Audi A4 2.0T
Although the basic answer is “a BorgWarner K03-type turbo,” owners and buyers often want more precise details: engine codes, part numbers, and how the turbo changes—or doesn’t—across different trims and drivetrains.
Engine Codes and Their Turbo
The same basic turbo architecture is used on several EA888 Gen 2 engine codes fitted to the 2011 A4, though small differences in part numbers can appear due to region or emissions standards.
The following list explains the most common 2011 A4 engine codes and what they imply for the turbo setup.
- CAEB (North America, many markets): 2.0 TFSI engine widely used in 2009–2012 A4 models. Equipped with a BorgWarner K03-type turbocharger integrated with the exhaust manifold. This is the typical engine code for a 2011 A4 2.0T quattro in the U.S. and Canada.
- CDNB / CDNC (Europe and some other regions): 2.0 TFSI variants with similar outputs and also using a BorgWarner K03-type turbo. Differences are mainly in emissions hardware and tuning, not in the fundamental turbo design.
- CAGA / other diesel codes (2.0 TDI): While not gasoline-turbo TFSI units, the 2011 A4 could also be specified with 2.0 TDI engines using variable-geometry turbos (typically Garrett). These are diesels, not the 2.0T gasoline engine most people refer to when asking “what turbo is in a 2011 A4?”
In practice, if you have a gasoline 2011 Audi A4 badged 2.0T or 2.0 TFSI, you almost certainly have an EA888 Gen 2 engine with a BorgWarner K03-type turbo, regardless of minor regional engine code differences.
Turbo Part Numbers and Variations
Exact Audi and BorgWarner part numbers can vary, but they fall into a narrow family of similar units. Enthusiast and parts catalogs typically list turbo assemblies under Audi/VW part numbers that start with “06H” or similar prefixes for EA888 Gen 2 engines. Because Audi occasionally supersedes part numbers (for example, updating to a revised bearing or wastegate component), the number you see in a modern catalog may differ from the number printed on an original 2011 unit, even though the turbo is functionally the same.
Why Audi Chose a K03-Type Turbo for the 2011 A4
The selection of a relatively small, quick-spooling turbo was a core component of Audi’s engineering strategy for the B8 A4. Rather than chasing peak horsepower, the focus was on drivability, fuel efficiency, and low-end torque to move a fairly heavy, all-wheel-drive sedan or Avant with confidence.
Performance and Driveability
The BorgWarner K03-type turbo fitted to the 2011 A4 2.0T is sized to deliver usable boost from relatively low RPM. This results in strong mid-range torque and a broad, flat power band that feels responsive in everyday driving. Compared with larger turbos that might offer greater top-end power, this setup trades maximum output for lower lag and better daily comfort.
Reliability and Known Issues
Overall, the turbo unit itself is not the weakest link of the 2011 A4 powertrain; typical owner issues for this generation more often involve oil consumption (pistons and rings), PCV systems, and timing chain tensioners. However, as with any turbocharged engine, long-term reliability depends heavily on proper oil changes, warm-up and cool-down habits, and addressing boost or vacuum leaks promptly.
The following list outlines the main turbo-related concerns owners may encounter with a 2011 A4 2.0T and how they connect to the turbocharger.
- Wastegate wear or rattle: Over time, the wastegate actuator rod or flapper can develop play, leading to a rattling noise and, in some cases, reduced boost or an underboost code.
- Boost leaks: Cracked or loose intercooler hoses, diverter valve failures, or PCV issues can mimic turbo failure symptoms (loss of power, surging) even when the turbo internals are still healthy.
- Oil-related turbo damage: Extended oil change intervals, poor-quality oil, or sludge can lead to bearing wear in the turbocharger, causing whining, smoke, or eventual failure.
- Exhaust manifold cracking (integrated housing): Because the turbo is integrated with the exhaust manifold, a crack in this assembly can mean replacing the entire turbo unit rather than just a separate manifold.
These issues aren’t guaranteed, but they represent the most typical turbo-adjacent problems for this platform and underscore why preventive maintenance and attentive diagnostics matter for a 2011 A4 owner.
How to Confirm Which Turbo Your Specific 2011 A4 Has
Although nearly all gasoline 2011 A4 2.0T models share the same fundamental turbo type, some owners want a precise identification for repairs, tuning, or upgrades.
Checking the Car’s Documentation and Labels
The most accurate way to confirm your exact turbo is to identify your engine code and then cross-reference that code with OEM parts catalogs.
The following list describes practical steps owners can take to identify their installed turbocharger.
- Find your engine code: Look in the service booklet, on a label in the spare wheel well, or on a sticker typically found in the engine bay. Codes like CAEB, CDNC, or CDNB are common for 2011 A4 2.0T engines.
- Use an OEM parts catalog: Enter your VIN or engine code into an official Audi parts portal, ETKA-based catalog, or a trusted dealer’s system to see the exact turbo part number listed for your car.
- Inspect the turbo physically: If accessible, the turbo housing often has a metal tag or cast-in numbers from BorgWarner. These can be cross-referenced with BorgWarner or aftermarket supplier databases.
- Consult a specialist or dealer: Audi dealers and independent VAG specialists can quickly pull the correct part number and confirm whether your car uses the original turbo or an updated replacement.
By following these steps, an owner can move from a general understanding—“BorgWarner K03-type on EA888 Gen 2”—to a precise part number and specification tailored to their exact VIN and market.
Implications for Tuning and Upgrades
Because the 2.0T engine and its factory turbo are popular in tuning circles, understanding the stock turbo is important if you’re considering performance modifications.
What the Stock Turbo Can Handle
The factory BorgWarner K03-type turbo on the 2011 A4 is capable of safely delivering more power than stock when paired with ECU tuning and supporting modifications, but it has limits. Many tuners offer “Stage 1” and “Stage 2” software that still use the original turbo, typically increasing boost and optimizing fueling and timing.
The following list outlines common tuning paths and how they relate to the stock turbo.
- Stage 1 tune (stock hardware): Software-only tuning can yield a noticeable gain in power and torque while remaining within what the stock turbo can safely manage, assuming good mechanical condition.
- Stage 2 tune (bolt-ons, same turbo): With a high-flow downpipe, intake improvements, and intercooler upgrades, the stock turbo can deliver higher sustained output but will eventually hit its efficiency ceiling.
- Turbo upgrade path: For substantially higher power, owners typically move to a larger turbo—either an OEM+ style unit (K04 upgrade) or a full aftermarket kit. This requires fueling and sometimes internal engine upgrades.
- Thermal management: Higher boost increases heat, making a healthy intercooler and oil cooling especially important for keeping the stock turbo alive under tuned conditions.
While the factory turbo is a solid foundation for modest, reliable gains, serious power increases push owners toward bigger or hybrid turbos, at which point the original K03-type becomes the limiting component.
Summary
The 2011 Audi A4 2.0T (EA888 Gen 2) is equipped from the factory with a BorgWarner K03-type single-scroll turbocharger integrated with the exhaust manifold. Across common engine codes such as CAEB, CDNB, and CDNC, this compact turbo prioritizes low-end torque, responsiveness, and everyday drivability over peak horsepower. Although exact part numbers differ by market and VIN, the core turbo design is consistent: a small, fast-spooling BorgWarner unit that forms the heart of the 2.0 TFSI’s character.
For owners, this means a reliable and tunable platform, provided maintenance is meticulous and issues like wastegate wear, boost leaks, and oil quality are managed carefully. Anyone needing precise turbo identification should use their engine code or VIN with an OEM parts catalog or specialist. In practical terms, however, when you ask what turbo is in a 2011 Audi A4 2.0T, the answer is clear: a BorgWarner K03-type turbocharger matched to the EA888 Gen 2 engine.
What Audi A4 to stay away from?
The worst model year for the Audi A4 was 2011. This model year of the Audi A4 experienced a variety of mechanical difficulties and failures, with the majority of them coming from the engine. The most prevalent complaint about the 2011 Audi A4 was that it was not at all fuel-efficient and routinely ate up gas.
Does the 2011 Audi A4 have a turbo?
Acceleration and Power. Unlike previous years, the Audi A4 only offers one power plant: a 2.0 liter four-cylinder turbocharged engine that makes 211 horsepower. Unfortunately, the V6 engine is no longer available, making it tough for the 2011 Audi A4 to compete with rivals.
What engine is in the 2011 Audi A4 2.0 T?
Engine
| Base engine size | 2.0 L |
|---|---|
| Cylinders | Inline 4 |
| Base engine type | Gas |
Is the Audi A4 quattro turbo?
A 2.5-litre V6 Turbocharged Direct Injection diesel engine with 150 PS (110 kW; 148 bhp) was standard on the Quattro.
