4.2 V8 (MPI) with 190A Alternator
My 2004 A6 (C6) has the 4.2lt V8 40v (MPI) with engine code: BAT
I had the specs pulled via the VIN and this lists PR Code 8GH - Alternator 190 A So far I've not removed the under engine cover to actually look but from what I've discovered online it would seem this car might have a water cooled alternator? Since I got the vehicle in November last year I've noted my rear demister isn't functioning, when pressed the led lights up momentarily on the console then switches off by itself, Searching here has pointed me towards the voltage regulator as a possible cause. I ran a diagnostics a couple of nights back and had this come up Address 61: Battery Regul. Labels: 4F0-910-181.lbl Part No SW: 4F0 910 181 E HW: 4F0 915 181 A Component: ENERGIEMANAGER H11 0490 Revision: 00000000 Serial number: 00000000044075 Shop #: WSC 63830 981 12485 VCID: 234FF155E2CED91 Subsystem 1 - Part No: 4F0 915 105 D Component: von VA0 2703070891 Coding: 344630393135313035442056413032373033303730383931 Shop #: WSC 63830 741 68830 5 Faults Found: 02273 - Quiescent Current Stage 2 000 - - - Intermittent Freeze Frame: Fault Status: 00100000 Fault Priority: 7 Fault Frequency: 2 Mileage: 1048575 km Time Indication: 0 Date: 2019.06.03 Time: 16:30:46 02256 - Quiescent Current 001 - Upper Limit Exceeded - Intermittent Freeze Frame: Fault Status: 00110001 Fault Priority: 7 Fault Frequency: 2 Reset counter: 215 Mileage: 106743 km Time Indication: 0 Date: 2019.06.03 Time: 23:37:14 02276 - Quiescent Current Stage 5 000 - - - Intermittent Freeze Frame: Fault Status: 00100000 Fault Priority: 7 Fault Frequency: 1 Mileage: 106753 km Time Indication: 0 Date: 2019.06.05 Time: 06:00:32 02274 - Quiescent Current Stage 3 000 - - - Intermittent Freeze Frame: Fault Status: 00100000 Fault Priority: 7 Fault Frequency: 1 Mileage: 106753 km Time Indication: 0 Date: 2019.06.05 Time: 06:00:42 02277 - Quiescent Current Stage 6 000 - - - Intermittent Freeze Frame: Fault Status: 00100000 Fault Priority: 7 Fault Frequency: 1 Mileage: 106753 km Time Indication: 0 Date: 2019.06.05 Time: 06:00:52 |
To answer one of your questions, yes the alternator in your vehicle is water cooled. As for replacing the voltage regulator without removing the alternator...if by voltage regulator you are referring to the battery regulator, well that's in your trunk. I would also strongly recommend you check that your battery is good since the Quiescent errors are typically related to a low battery.
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Originally Posted by raj99
(Post 25328189)
To answer one of your questions, yes the alternator in your vehicle is water cooled. As for replacing the voltage regulator without removing the alternator...if by voltage regulator you are referring to the battery regulator, well that's in your trunk. I would also strongly recommend you check that your battery is good since the Quiescent errors are typically related to a low battery.
And I did mean Voltage Regulator, that goes in the back of the alternator. as opposed to the Battery Regulator located in the trunk. I've found the replacement part online but unsure if it can be fitted without fully removing the alternator from the vehicle first. Cheers. |
Yet in your readout it clearly says "Address 61: Battery Regul. Labels: 4F0-910-181.lbl". Just saying :)
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I would second what Raj said. Give the battery an overnight trickle charge, clear the stored error codes and scan again. You may even fix the demister suddenly works again with a fully charged battery, since the energy management system disables non-essential systems when battery power is low.
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I appreciate your responses and I'll take your suggestions under advisement, however nobody has answered my actual question of whether or not the voltage regulator can be swapped out without having to fully remove the alternator.
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