2505 EGR valve plug – Audi Seat 2.0 TDI

Application:

AUDI
A4
A4 Allroad B8 (8KH)
2.0 TDI quattro CAHA 2009/04 - 2016/05 125 kW 170 KM 1968
2.0 TDI quattro CJCA, CAGA 2009/09 - 2016/05 105 kW 14 KM³ 1968

A4 B8 (8K2)
2.0 TDI CAHA 2008/01 - 2012/03 125 kW 170 1968
2.0 TDI quattro CJCA, CAGA 2008/11 - 2015/12 105 kW 143 KM 1968
2.0 TDI quattro CAHA 2008/01 - 2012/03 125 kW 170 KM 1968
2.0 TDI CJCA, CAGA, CMFA, CMEA 2007/11 - 2015/12 105 kW 143 KM 1968

A4 B8 Avant (8K5)
2.0 TDI CJCA, CAGA, CMFA, CMEA 2008/04 – 2015/12 105 kW 143 KM 1968
2.0 TDI quattro CAHA 2008/08 – 2012/03 125 kW 170 KM 1968
2.0 TDI quattro CJCA, CAGA April 2008 – December 2015 105 kW 143 KM 1968
2.0 TDI CAHA April 2008 – March 2012 125 kW 170 KM 1968

A5
A5 (8T3)
2.0 TDI CAHA 2008/08 - 2012/03 125 kW 170 KM 1968
2.0 TDI quattro CAHA 2008/08 - 2012/03 125 kW 170 KM 1968

A5 Convertible (8F7)
2.0 TDI CAHA 2009/05 - 2012/03 125 kW 170 KM 1968

A5 Sportback (8TA)
2.0 TDI quattro CAHA 2009/09 - 2012/03 125 kW 170 KM 1968
2.0 TDI CJCA, CAGA, CMFA, CMEA 2009/09 - 2017/01 105 kW 143 KM 1968
2.0 TDI CAHA 2009/09 - 2012/03 125 kW 170 KM 1968

A6
A6 C6 (4F2)
2.0 TDI CAHA 2008/11 - 2011/03 125 kW 170 KM 1968

A6 C6 Avant (4F5)
2.0 TDI CAHA 2008/10 - 2011/08 125 kW 170 KM 1968

Q5
Q5 (8RB)
2.0 TDI quattro CGLB, CMGA, CAHA 2008/11 - 2012/09 125 kW 170 KM 1968
2.0 TDI quattro CJCA, CAGA 2009/08 – 2013/05 105 kW 143 KM 1968

SEAT
EXEO
EXEO (3R2)
2.0 TDI CAHA, CGLB 2009/02 - 2013/05 125 kW 170 KM 1968
2.0 TDI CJCA, CAGA 2008/12 - 2013/05 105 kW 143 KM 1968

EXEO ST (3R5)
2.0 TDI CAHA, CGLB 2009/05 - 2013/05 125 kW 170 KM 1968
2.0 TDI CJCA, CAGA 2009/05 - 2013/05 105 kW 143 KM 1968  

OEM Numbers 069131547D, 03L131547D, 03L131521AD, 03L131521AH, 03L131501E, 03L131501K


After installing the plug, the EGR valve must be deactivated via the software to prevent an EML error from appearing.

Technical specifications:

plug material: acid-resistant steel, 1.5 and 4 mm;
    all plugs undergo specialized vibratory finishing. This process removes sharp edges and ensures a uniform surface;
gasket material: GAMBIT AF-1000, a material with exceptionally high strength properties, resistant to all conditions encountered in the exhaust system.

AT-EGR-670 and AT-EGR-505

Aditech Sp. z o.o. assumes no liability for the use of this part on public roads where the removal of emission control devices is prohibited. It is the customer’s responsibility to ensure compliance with the rules and regulations applicable in their home country. For use in motorsports off public roads.

The ADITECH AT-EGR-2505 plug fits select Audi and Seat models with a 2.0 TDI engine displacing 1968 cm³. The set includes the EGR valve plug and gaskets; the 4 mm thick rigid sheet metal does not bend in your hand when you try it on. The product is intended for off-road motorsports use.

Compatibility with Audi and Seat Models

The product fits engines with power ratings of 105 kW (143 KM) and 125 kW (170 KM), including engines with the codes CAHA, CJCA, CAGA, CMFA, CMEA, CGLB, and CMGA. Compatibility is confirmed by the following OEM numbers: 069131547D, 03L131547D, 03L131521AD, 03L131521AH, 03L131501E, and 03L131501K.

The plug is designed for the Audi A4 Allroad B8, A4 B8, A5, A6 C6, Q5, and Seat Exeo and Exeo ST models manufactured from July 2011 through January 2017. Mechanical installation is straightforward for anyone who has previously worked on an EGR flange, as the shape matches the factory dimensions and does not require filing to fit.

How does the EGR system work in a 2.0 TDI engine?

The EGR valve directs a portion of the exhaust gases back into the intake manifold. In a diesel engine with a Common Rail system, this exhaust gas recirculation lowers the combustion temperature and helps reduce NOx emissions. In practice, a mixture of soot and oil gradually narrows the passages, which is why the system often becomes clogged in the 2.0 TDI.

Symptoms of a clogged or damaged valve

The most common symptoms include: rough idling, sluggish throttle response, smoke, and an EML error message. A blanking plug mechanically cuts off the exhaust flow, but after installation, the EGR valve function must be disabled via the software; otherwise, the control module will continue to report a fault. The error is not caused by the metal plate itself, but by the fact that the electronics still expect the system to be operational.

Kit, Construction, and Important Installation Notes

The plug is made of acid-resistant steel, and the working part is 4 mm thick, so it withstands high temperatures and pressure on the flange well. Vibratory finishing removes sharp edges, evens out the surface, and ensures the part is smooth to the touch, with no burrs during assembly. While this is a mechanically simple component, proper clamping force and clean contact surfaces are crucial.

GAMBIT AF-1000 gaskets have a dense, slightly rough texture and are resistant to the conditions found in the exhaust system. This material reduces the risk of blow-by, and during installation, the gasket does not feel like thin sheet metal and does not deform easily under the bolt.

Key components and product specifications include:

• a 4 mm thick ADITECH EGR plug
• a set of gaskets made of GAMBIT AF-1000 material
• product code AT-EGR-2505 for easy part verification
• EAN number 5905325865936, confirming product identification

This part is intended for off-road sports use. Removing emission control devices for use on public roads is prohibited.

FAQ

Which engines and models is the AT-EGR-2505 plug compatible with?

It fits the 2.0 TDI 1968 cm³ (105 kW/125 kW — 143/170 KM); engine codes: CAHA, CJCA, CAGA, CMFA, CMEA, CGLB, CMGA. Models: Audi A4/A4 Allroad B8, A5, A6 C6, Q5, and Seat Exeo and Exeo ST (July 11, 2011–January 2017).

Does the cover require adjustment, and does the sheet metal deform during installation?

The shape matches the factory dimensions and does not require cutting; the 4 mm-thick stainless steel is rigid, and machining removes any burrs. Proper clamping force and clean contact surfaces are essential.

Do you need to change the ECU settings after plugging the valve, and is the installation legal for road use?

After mechanical plugging, the EGR valve function must be disabled via software; otherwise, the ECU will report an error. This component is intended for off-road sports use; eliminating emissions on public roads is prohibited.