Battery in engine compartment, removing and installing

WARNING: This page does not describe the selected car, but rather 16 other vehicles, including the 2009 Audi S4, 2009 Audi A4, 2008 Audi S4, 2008 Audi RS 4, and 2008 Audi A4. However, it is still accessible from the selected car via links, so may be relevant.

Removing

CAUTION:

Prior to handling or servicing batteries, read, understand and observe the Warning and Safety Measures for lead-acid batteries → Warnings and safety measures for lead-acid batteries
Always wear suitable protective clothing Eye protection and protective clothing: .

CAUTION: Before beginning repairs on the electrical system:

Where applicable, obtain anti-theft radio security code.
Switch off all electrical consumers.
Switch the ignition off and remove ignition key.
Disconnect negative ( - ) battery terminal.

On vehicles equipped with Audi Telematics by OnStar ^(R) , switch-off the emergency (back-up) battery for the Telematic/Telephone Control Module prior to disconnecting vehicle battery → 91 - COMMUNICATION
After reconnecting vehicle battery, re-code and check operation of anti-theft radio. Also check operation of clock and power windows according to Repair Information and/or Owners Manual.
After reconnecting vehicle battery on vehicles equipped with Audi Telematics by OnStar ^(R) , switch-on the emergency (back-up) battery for the Telematic/Telephone Control Module → 91 - COMMUNICATION

Special tools, testers and auxiliary items required

Fig 1: Identifying Torque Wrench V.A.G. 1331

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Torque wrench VAG 1331 or (equivalent 5 - 50 Nm)

Fig 2: Identifying Plenum Chamber Cover & Removing Rubber Seal

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Remove rubber seal from plenum chamber cover in direction of - arrow -.
Remove plenum chamber cover - 1 - from the front.
Disconnect negative ( - ) terminal - 1 - from battery

Fig 3: Locating Battery Terminals On Battery

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Then disconnect positive ( + ) terminal - 2 - from battery.
Remove bolt - 4 - from battery hold-down bracket - 3 -.

NOTE:

On vehicles with suspension cross-brace, hex socket bolt - 4 - must be removed using an Allen key with ball head.
Loosen bolt enough so that ball head of Allen key contacts suspension cross-brace.
Leave bolt and securing bracket in place and swivel battery out from under hold-down bracket.

Fig 4: Identifying Angle Piece Of Central Gas Venting System

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Disconnect angled connector of central gas venting system - arrow -.
Carefully lift battery out of plenum chamber.

CAUTION: When disposing batteries it is absolutely necessary that the disposal procedures for batteries and sulfuric acid are observed.

Installing

Install in reverse order of removal, noting the following:

NOTE:

Only maintenance-free batteries conforming to standards "TL82506" (as of December 1997) and "VW75073" (as of August 2001) may be installed.
Batteries from the Audi parts range feature a base strip adapter for matching to different retainer flanges. The battery operating instructions give details of when and how to use the base strip adapter.

Fig 5: Battery Foot Strip Cut-Out

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Insert battery in battery carrier so that lug at rear of battery carrier - arrow - engages in recess in battery base strip - 1 -.

It should no longer be possible to move the battery.

Fig 6: Center Cut-Out In Battery Foot Strip Aligned With Threaded Hole In Battery Carrier

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The battery has been properly inserted if the center recess in the battery base strip aligns with the tapped hole in the battery tray - arrows -.

Fig 7: Locating Battery Terminals On Battery

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Install battery hold-down bracket - 3 - and fasten with bolt - 4 -.

NOTE:

Lug on battery retainer must engage in recess on battery base strip.

Reconnect battery in the following sequence with ignition and electrical equipment switched off:

First connect positive ( + ) terminal - 2 - to battery post and torque nut to specification.
Then connect negative ( - ) terminal - 1 - to battery post and torque nut to specification.
Connect hose for central gas venting system; see notes → Batteries with central gas venting .
Check firm attachment of battery following installation → Battery installation, checking .

The following steps are required after reconnecting battery:

NOTE:

When reconnecting battery, activate vehicle equipment (radio/radio navigation system, clock, electric window lifters) in accordance with Owners Manual.
On vehicles equipped with Audi Telematics by OnStar ^(R) , switch on emergency (back-up) battery → 91 - COMMUNICATION .
Further measures after reconnecting the voltage supply, refer to appropriate engine repair information, RG 24.
Check proper function of remote control keys; adapt keys if necessary. Inform customer that all additional keys must also be adapted to ensure that the remote control works properly Owners Manual.
After re-connecting battery, the ESP indicator lamp will go out only after driving a distance of several meters.

Tightening torques

Component - fastener	Nm
Battery hold-down bracket - nut	12
Battery terminal to battery post - nut	7.5