Audi A4 B7 Ecu Relay. A new relay fixed the problem and the car started right up. FYI I have also had the same issue with a clients car and I decided to replace BOTH ECM relays there are 2 ECM relays for a 2007 A4 cabrio quattro maybe 2 for others as well - check your specific wiring diagramIm 99 sure itll fix the problem Ill post here if it doesnt.
Audi A4 Oxygen Sensor Relay. Opened the ECU box under the bonnet and it was full of water the relays were blue on the pins. Bad Relays In Ecu Box Ecm Power Relay Control Circuit J271 Open.
And there are TWO 614 relays under there the most forward one to you is the one related to the pump.
Audi A4 Air Pump Relay. 2005-2008 06 07 AUDI A4 B7 - ECU ENGINE MODULE WIRING HARNESS CONNECTOR SET Fits. Audi A4 Daytime Running Light Relay. Relay 395 8Z0951253 Multifunction Relay Depending on the vehicle relay 395 is used for the horn fuel pump water pump windshield washer unit etc.