Audi EGR Valve Guide - OEM Part Numbers by Engine Code

The EGR valve remains one of the most frequently searched components on audioemparts.com. Part numbers like 06M131055HS and 06M131055FE appear in thousands of monthly searches as owners try to match the exact valve to their specific engine.

We'll explain how the EGR system operates, which part numbers fit different engines, the common signs of a failing valve, and why sticking with OEM replacements makes a difference for the EA888 engine family.

What the EGR Valve Does on an Audi

EGR stands for Exhaust Gas Recirculation. This valve directs a precise amount of exhaust gas back into the intake manifold, lowering combustion temperatures and reducing nitrogen oxide emissions. On the EA888 2.0T engine found in the Audi A4, Q5, A6, and other models, the valve works together with the EGR cooler. If the valve fails or clogs with heavy carbon deposits, the entire system struggles, and the engine management system logs a fault code.

Common EGR Fault Codes on Audi Models

Here are the most frequent fault codes tied to EGR system issues on the EA888 engine:

• P0400 points to a general EGR flow malfunction.
• P0401 means EGR flow is insufficient.
• P0402 indicates excessive EGR flow.
• P0403 relates to the EGR solenoid circuit.
• P0404 and P0405 point to EGR position sensor faults.
• P0406 through P0408 relate to sensor rationality and circuit issues.

An Audi-specific scan tool, such as VCDS or OBDeleven, gives you a much clearer picture. The fault description shows the exact valve position readings and indicates whether the code is currently active or only stored in history. This extra detail makes it easier to tell whether the valve itself is broken or the problem lies in the EGR cooler, passages, or wiring harness.

EGR Valve Part Numbers by Engine Code

The EA888 engine family uses several EGR valve part numbers, and the correct one depends on your engine code, model year, and emissions specs. Installing the wrong part can cause fitment headaches, or you may end up with a valve that physically cannot plug into your wiring connector. Always verify your specific engine code before ordering parts.

Engine Code CAEB - 2009 to 2012 Audi A4, Q5, A6 with 2.0T

You will find the CAEB engine in B8 A4 models built from 2009 to 2012, as well as early FY Q5 models. It requires an EGR valve with a very specific connector angle and a flow rate that matches its original emissions tune. Be sure to verify the correct part by entering your VIN on audioemparts.com before you buy.

Engine Code CDNC and CPMB - 2012 to 2015 Audi A4, Q5 with 2.0T

The CDNC and CPMB engines power the B8.5 generation A4 and mid-cycle Q5 vehicles. While they share a basic EGR architecture with earlier models, their connector specifications have been updated. Because these run strictly on direct injection without the cleaning benefit of port fuel washing, they tend to accumulate carbon buildup much faster.

Engine Code CNCD and EA888 Gen 3 - 2015 Onward

Later EA888 Gen 3 engines found in the B9 A4, FY Q5, and related vehicles require completely updated EGR valve assemblies. Part numbers 06M131055HS and 06M131055FE are highly searched for this generation.

These specific numbers cover different production windows and connector styles. If you need either, double-check your build date and VIN to confirm which one fits your car. Both are stocked as genuine OEM parts at audioemparts.com.

Why Carbon Buildup Is the Main EGR Failure Mode on EA888 Engines

The EA888 2.0T uses gasoline direct injection. On older port-injected engines, fuel constantly sprayed over the intake valves and EGR passages, keeping them naturally clean. Direct injection bypasses this entirely by spraying fuel straight into the cylinder. As a result, oil mist and carbon deposits slowly choke the intake valves, manifold, and EGR passages.

The EGR valve sits right in the middle of this dirty airflow. Over tens of thousands of miles, hard carbon builds up on the valve pintle and seat until the mechanism can no longer open or close properly. If it gets stuck open, you will get a rough-running engine and lean or EGR flow fault codes. If it gets stuck closed, exhaust gas flow drops, and emissions codes will trigger.

By the time these cars hit 60,000 miles, the EGR valve is usually caked in carbon, even if the engine hasn't triggered a check engine light yet. Checking the valve during any major engine service is a smart preventive step.

Symptoms of a Failing Audi EGR Valve

A check engine light throwing codes in the P0400 range is your clearest warning sign. You might also notice a rough idle once the engine warms up, especially when sitting in gear or lightly accelerating. Some drivers notice a faint sulfur smell from the exhaust at low speeds.

A hesitant throttle is another clue; the engine may feel like it is stumbling for a second before finally building power. Because the computer tries to adjust fuel trims to compensate for poor airflow, a clogged EGR valve can even hurt your gas mileage.

OEM vs Aftermarket EGR Valves on the EA888

You can find plenty of aftermarket EGR valves for the EA888, and the cheaper price tag is definitely tempting. The problem is that Audi's EGR valve is not just a basic on-off switch. It includes a sensitive position sensor that constantly talks to the engine management system.

The car's computer checks the actual valve position against what it expects on every engine cycle. If an aftermarket valve has slightly different sensor calibrations, your car will keep throwing fault codes even though the new part is mechanically fine.

Genuine OEM EGR valves from audioemparts.com are the exact same units your local Audi dealership uses for warranty repairs. They guarantee the correct sensor calibration, flow rate, and connector style for your specific engine code. All parts ship directly from our authorized Audi Henderson dealership, and we verify your VIN before shipping anything.

Replacing Related Parts at the Same Time

If you are swapping out the EGR valve on an EA888, take the time to inspect and clean the EGR cooler. The same carbon sludge that ruins the valve will also clog the cooler passages. If you bolt on a new valve but leave a restricted cooler in place, the fault codes will usually return.

You should also clean out the EGR passages in the intake manifold. For higher-mileage cars, many mechanics combine an intake manifold carbon cleaning with an EGR replacement to address all the engine's buildup issues at once.

For B8 and B8.5 generation vehicles, always replace the EGR valve gasket. Reusing an old, compressed gasket easily leads to annoying exhaust leaks right at the port.

Frequently Asked Questions - Audi EGR Valve

Can I drive my Audi with a bad EGR valve?

You can usually drive with a stored EGR fault code, but the problem will not fix itself. On certain Audi models, ignoring the fault for too long will push the car into a reduced-power mode to protect the emissions system. It is best to handle EGR issues as soon as you practically can.

Will cleaning the EGR valve fix the problem?

Cleaning can save the valve if carbon buildup is the only issue and the internal electronics still work. However, if the position sensor is dead or the solenoid has failed, no amount of cleaning will clear your fault code. Scanning the car properly before taking things apart will save you a lot of wasted effort.

How do I find the correct EGR valve part number for my Audi?

Providing your VIN when ordering from audioemparts.com is the safest approach. Your VIN tells us your exact engine code, build date, and emissions package, guaranteeing you get the right part.

Is the EGR valve the same as the EGR cooler?

No. The valve opens and closes to control exhaust flow. The cooler simply lowers the temperature of the exhaust gas before it reaches the intake manifold. Either part can fail, so check both when diagnosing system faults.

How much does an OEM Audi EGR valve cost?

Pricing depends heavily on your specific engine code and model year. For accurate, up-to-date pricing, search your part number at audioemparts.com or contact us at [email protected]. Include your VIN, and we will confirm the correct price.

Shop Genuine OEM Audi EGR Valves at AudiOEMParts.com

Genuine OEM EGR valves, coolers, intake manifold cleaning kits, and gaskets for every Audi engine code are available right now at audioemparts.com. We VIN-verify every order and ship fast directly from our authorized Audi Henderson dealership. Email us at [email protected] with your VIN before buying, and we will make sure you get the perfect fit.