Hello I need a full wiring diagram for a 2008 Audi A4

The fuel pump fuse is located in the engine bay fuse box. It is the 2nd row from the top, last fuse on the left.

The OBD2 port is connected directly to the ECM and data from other modules is shared from there.

'Mechanics' deal with the mechanical aspects of the car, you need a specialist auto electrician. They have the knowledge and experience and the ability to access and read wiring diagrams.

https://www.google.com/search?q=auto+electrician+near+me

The first thing to check would be the connectors on the ECM and BCM. Then open them up and look for burned out components.

Full wiring diagrams normally require a website paid or unpaid subscription.

https://www.google.com/search?q=1999+Audi+A6+Avant%2C+1.9TDI+wiring+diagram

Re-reading the question, did you have one model and year of vehicle and then replace the engine from a different year and model? You can't do that, the ECM has no idea what's going on. ECM are dedicated to the engine it is connected to and programmed accordingly

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Question edited for clarity.
Question mover from 'Power computers to model category.

It has some strange 'Connector Stations', but check the connection pins under those fuses. To find a full wiring diagram, you need the service manual or a subscription to a site like AllData.

https://fuse-box.info/audi/audi-a4-s4-8e-8h-2005-2008-fuses

https://www.google.com/search?q=2004+audi+a4+wiring+diagram

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You should check out www.reliable-store.com they have info on repair,
service, wiring diagram, electrical diagram, fuse diagram, troubleshooting, PCV, owner's/service/repair/parts manual, fault codes, error codes, etc everything on all vehicles. must check it out

Take out the 30th fuse from SB42, in the instrument panel fuse box for 30 seconds and then reinstall. This will reset the control module.

I’m happy to assist further over the phone at https://www.6ya.com/expert/kim_3202917d7c587455

P0501 - Vehicle Speed Sensor (G22): Implausible Signal Possible Causes

• Wiring/Connectors from/to Vehicle Speed Sensor (G22) faulty
• Wiring/Connectors from Transmission Control Module (J217) to Engine Control Module faulty
• Vehicle Speed Sensor (G22) faulty
• Malfunctioning Left Front wheel speed sensor (in vehicles that don't use a physical G22 sensor)

Possible Solutions

• Check Wiring/Connectors from/to Vehicle Speed Sensor (G22)
• Check Wiring/Connectors from Transmission Control Module (J217) to Engine Control Module
• Check Vehicle Speed Sensor (G22)
• Check ABS Brakes for faults and diagnose malfunctioning Left Front wheel speed sensor if applicable

Category:

• Fault Codes

[PDF]Wiring Diagram.pdf - Ken Gilbert

ken-gilbert.com/wrx/mans/99.../Wiring%20Diagram.pdf

Each connector number shown in the wiring dia- ... Rear defogger cord (Ground). Fuel tank cord,. Roof cord, ... circuit. Then check the switch, relay, fuse, ground, etc. 4. .....Rear wiper motor. Rear wiper ... License plate light RH. Tail light LH.

#? license plate light - Circuit Wiring Diagrams

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2008 Volkswagen Newbeetle Main Fuse Box Diagram 2008 Volkswagen Newbeetle ...Parts: rear window defogger, shift lock, battery positive voltage, interior light, A/C clutch, ... brake light, daytime driving light, wiper and washer system, vacan, fuel pump, central ... 1997 Suzuki Geo Tracker Left Dash Fuse Box Diagram.

#? license plate light - Circuit Wiring Diagrams - Page 3

circuitswiring.com/tag/license-plate-light/page/3/

Audi A4 Engine Fuse Box Diagram Audi A4 Engine Fuse Box Map Fuse Panel ... mirror control, wiper, washer, horn, brake light, cruise control, heated rear window, ... 2003Suzuki Aerio Dash Fuse Box Diagram 2003 Suzuki Aerio Dash Fuse Box ... rear defroster, fuel injection controller, radio, A/T controller, hazard light, ...

Check this website you find there fuse box diagram and description for Audi A4

A4 CARKNOWLEDGE

The easiest way to wire it is to get a pre-fit harness that fits the vehicle and stereo. Search the stereo's web site to find one.

leave it to a specialest or maindealer