Technical Bulletin

Audi A4 And Mercedes-Benz Vito

Autodata looks into two known issues with Audi A4 and Mercedes-Benz Vito.

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Audi A4


We have a 2008 Audi A4 2,7 TDI in the workshop with the engine malfunction indicator lamp (MIL) illuminated. Trouble codes stored in the fault memory relate to the exhaust gas recirculation (EGR) system. We have had a look at the EGR system and cannot see a blockage anywhere. Have you got any ideas?


Yes, we have seen trouble codes related to the EGR cooler pump on 2,7 TDI engines with CAMA/CAMB engine codes. We found there is an engine control module (ECM) software issue and a possible compatibility issue with early type exhaust gas recirculation (EGR) cooler pumps. Re-program the engine control module (ECM) with upgraded software. Inspect the production date code on the EGR cooler pump (Fig.1). The last five numbers indicate the year and day  of manufacture. If the date code is before 09 T 173, then fit a modified EGR cooler pump. Erase the trouble codes.

Mercedes-Benz VITO


We have a 2015 Mercedes-Benz Vito in our workshop with the SRS warning lamp illuminated, seat heating not working and several electrical related trouble codes stored. Have you any ideas where to start to fix this vehicle?


We are aware of a SRS fault on Vito, V-Class and Valente models 2014 onwards. The fault is due to the front seat wiring harness chafing on the seat frame causing a short circuit. Inspect the front seat wiring harness for damage (Fig.2).

Repair or replace the front seat wiring harness as necessary. Re-route the wiring harness to provide adequate clearance. Erase trouble codes and check operation of the seat heating to ensure the fault has been rectified.

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