Loren

From the 2004 Cayenne Technik Book... "Battery Depending on specification and air-conditioning zones, the Cayenne is fitted with a battery having a capacity of 340 A/70 Ah to 450 A/95 Ah. As on the Cayenne S and Cayenne Turbo, the alternator is water-cooled and has a nominal output of 2100/2660 watts, depending on battery capacity. All Cayenne models can optionally be equipped with a backup battery (starter battery). This backup battery ensures that the vehicle can still be started even if the vehicle battery (main battery) is discharged. The capacity of the backup battery is 480 A/85 Ah. If two batteries are fitted to the vehicle (main battery and backup battery), these are connected or disconnected to the bus bar in the power distributor through a relay. The switching of the two batteries is controlled independent of the load management (function is integrated in the vehicle electrical system control unit). The starter relay of the 2nd battery is actuated parallel to the starter relay. That means for every start the starter is supplied from both batteries. The backup battery is disconnected from the vehicle electrical system when the engine is switched off and then supplies just one consumer, the vehicle electrical system control unit. For crash protection purposes, the backup battery is designed using fleece technology. Note: The backup battery is accommodated in the spare wheel recess in the trunk. This installation location is also designated for the optionally available collapsible spare wheel and the subwoofer of the BOSE® High End surround sound system. This results in a restricted storage capacity in the spare wheel recess. On the Cayenne, the optional backup battery cannot be fitted in conjunction with a 17" collapsible spare wheel. In order not to exceed the maximum permitted rear axle load, no Cayenne model can simultaneously be equipped with the backup battery, a full-size spare wheel on the external holder and a trailer towing device. Vehicle electrical system control unit On vehicles with two batteries (vehicle electrical system and starter battery), the electronics of the vehicle electrical system control unit are supplied by both batteries. The vehicle electrical system control unit evaluates the exact vehicle electrical system situation by comparing the sensed voltage with the permissible minimum voltage. On vehicles with two batteries, the load management always takes the voltage of the vehicle battery as reference. If the vehicle electrical system control unit detects a critical battery condition, the consumption is reduced. For this the CAN bus requests some of the high voltage comfort consumers to reduce or switch off their power demand. By reducing the comfort functions with the “engine running”, the battery can be charged more. With the “engine off”, discharging of the battery can be reduced through the load management. Currently the following consumers are integrated in the load management: • Heated rear window, heated outside mirrors • Heated seats, front and rear • Heated steering wheel • Heater blower (3-stage) • Interior light, reading lamps, footwell lighting • 12 V sockets The following functions are activated by the vehicle electronic system control unit: • Load management • Side marker lights • Low beam • Cornering light, left and right • High beam • Auxiliary high beam • Direction indicator light • Headlamp leveling control • Potentiometer convenience lighting terminal 31 • Terminal 58 d • Interior and footwell lights • Fanfare horns • Dual washing pump • 12 V sockets • Electric fuel-pump relay 1 • Load relay • Rain sensor • Enable signal, heated seats"

Try 4238

Try 0853

Try 6410

Try 9206

Try 9438

Try 8918

Try 6436

Try 9659

Try 7489

Try 8979

Try 0376

Try 9056

P0175 Oxygen sensing adaptation Bank 2: System too rich Possible fault causes: - High fuel content in engine oil - Exhaust system leaks (Engine A Oxygen sensor in front of catalytic converter ) - Injection valve Faulty (Mechanical fault ) - Timing incorrectly set - Fault in area Fuel high pressure, Intake manifold pressure sensor, Throttle adjusting unit, Ambient pressure sensor, Intake air temperature sensor, Speed sensor, Valve lift control, Camshaft adjustment P0171 Oxygen sensing adaptation Bank 1: System too lean Possible fault causes: - Exhaust system leaks (Engine A Oxygen sensor in front of catalytic converter ) - Exhaust system Narrowed / Blocked - Injection valve Faulty (Mechanical fault ) - Timing incorrectly set - Fault in area Fuel high pressure, Intake manifold pressure sensor, Throttle adjusting unit, Ambient pressure sensor, Intake air temperature sensor, Speed sensor, Valve lift control, Camshaft adjustment I do not see anything here about misfires or coil issues. I think you will need more investigation here. I have seen a car with too lean in in bank and too rich in the other bank. Almost makes me think a fuel line might be blocked on one side causing over-pressure on the other side. Perhaps others can chime in...

Could you please give us the exact fault codes?

You need to remove your battery and get it load tested my guess is that if it is 4 years old or older you will need a new battery.

WKD 484 121 DME 7.8 OBD2 Manual - available from your Porsche OPC for about $315 (US). or you could post your fault codes here and we will try and help.

Try 0523

Sorry My mistake I just realized you have a 996TT - even though posted in the 996 section. I will move this to the appropriate section.

I sent you a PM.

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5 km/h = 3.10686 mph

There are 4 options for door locking - and any shop with a PST2 or PIWIS can program it for you. (Boxster and Carrera are the same)

Try 6538