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Hi everyone, I have a slightly irritating issue that has been ongoing for a few months now. Having driven this car for several years, normally its idle RPM is 800. However, for several months, the car is having intermittent periods of high idle at 1000 RPM and at times the idle can be slightly rough. The car has no fault codes on my Autel machine. The DPF values before and after the latest regeneration that happened this Tuesday were: Before Latest Regeneration Km Since Last Regeneration - 417.1Km Soot Mass Measured - 0.21g Soot Mass Calculated - 24.26g Oil Ash Volume - 55.3341711g Oil Ash Mass - 55.3341711g Ash Load Limit - 70g After Latest Regeneration Km Since Last Regeneration - 2.5Km Soot Mass Measured - -5.57g Soot Mass Calculated - 4.68g Oil Ash Volume - 55.3402682g Oil Ash Mass - 55.3352631g Ash Load - 70g When the car initiated this particular regeneration, a grumbling sound came from the engine bay which I had never heard before but it has not happened since. Having done some research, I am suspecting one of the following: Bad DPF differential pressure sensor/blocked DPF - unlikely as the DPF is regenerating every 415Km or so which I believe is fine Bad alternator - unlikely as there is no battery warning light and the voltage of the battery during idle is 14.5V Weak battery - again unlikely as there is no battery warning light Fuel injector issue - unlikely as there are no engine fault codes and the car is not misfiring Bad thermostat - unlikely as I fitted a new OEM thermostat from Audi in Nov 2023 Bad coolant temp. sensor - possible as it has not been changed, over the past week when motorway driving, the temp. gauge on the dash was fluctuating between 70 and 90C instead of staying at its usual 90C Also, over the past week or so, there has been an extra sound coming from the engine bay (I believe it is loudest on the offside of the car) that is louder on accelerating, not sure if this is related. This video of me testing the DPF differential pressure signal wire contains the sound of the engine on idle and while it is revving on idle (https://drive.google.com/file/d/1SfIBwlzODhr4Rjy9tdwqpNCoTVE_anyY/view?usp=drive_link). What are your thoughts as to what could be causing these issues? Any help would be much appreciated!

In Audi 2007 Q7 4.2L there is a single wire from the alternator to the energy management control module J644. I have been asked to check for its continuity as part of diagnosing Generator to Interface fault (02254) when I start the car. On the J644 side the end would be in the connector (pin 8?). Where would the wire be on the alternator side? Would there be an intermediate point too near the J644 module under the driver seat where I could check the continuity using a multimeter with the pin in the J644 connector?

Hello Experts, I have an Audi A6 2006 3.2 FSI Quattro, The Car recently Started showing the EPC Warning sign, whenever this happens in a few minutes the Car turns off, i had my eye on the Battery Status in MMI and whenever the EPC sign lights up my battery Starts Draining, When it reaches 0 it turns off and i have to Jump Start the car. Took it to a few mechanics to Find the issue and all they said was that it was the battery although i had my doubts, that's why i borrowed a New battery from a Friend to test it First and see. after the new Battery installation i drove it for about 2 days and got the EPC warning Again and noticed my Battery Status went from 100% to 70%. it has not turned off on me yet but i have a Feeling it will again. After the Recent EPC warning i Ran Diagnostics With VCDS and these are the Errors that it came up with. one thing to Add is that i noticed i Get the EPC Warning only When im Driving, If the Car is on park the sign Turns off. Address 61: Battery Regul. Labels: 4F0-910-181.lbl Control Module Part Number: 4F0 910 181 E HW: 4F0 915 181 A Component and/or Version: J0644 BEM H12 0590 Software Coding: Work Shop Code: WSC 02445 823 59480 Additional Info: 4F0915105C von VA0 1603160474 Additional Info: Geraet 59480 VCID: 234277A3E2C65F2660-8076 3 Faults Found: 02254 - Interface to Generator 004 - No Signal/Communication - Intermittent Freeze Frame: Fault Status: 00100100 Fault Priority: 4 Fault Frequency: 1 Reset counter: 88 Mileage: 251874 km Time Indication: 0 Date: 2017.02.06 Time: 11:34:38 00992 - Consumption Cut-Off Active 000 - - - Intermittent Freeze Frame: Fault Status: 00100000 Fault Priority: 7 Fault Frequency: 1 Reset counter: 255 Mileage: 251876 km Time Indication: 0 Date: 2017.02.06 Time: 11:40:22 02272 - Quiescent Current Stage 1 000 - - - Intermittent Freeze Frame: Fault Status: 00100000 Fault Priority: 7 Fault Frequency: 1 Reset counter: 255 Mileage: 251879 km Time Indication: 0 Date: 2017.02.06 Time: 11:49:05 Address 01: Engine Labels: 06E-910-559-BKH.lbl Control Module Part Number: 4F1 910 559 E HW: 4F1 907 559 A Component and/or Version: 3.2l V6 FSI 0070 Software Coding: 01050109190F0120 Work Shop Code: WSC 02325 785 00200 VCID: 2D56919BB4029956C6-8078 3 Faults Found: 002129 - Park/Neutral Switch Input Circuit P0851 - 006 - Short to Ground - Intermittent Freeze Frame: Fault Status: 00100001 Fault Priority: 2 Fault Frequency: 4 Reset counter: 39 Mileage: 251875 km Time Indication: 0 Date: 2017.02.06 Time: 11:36:59 Freeze Frame: RPM: 832 /min Mass Air / Rev.: 158.1 mg/str Temperature: 76.5°C Idle Load: 26.3 % Speed: 0.0 km/h 001109 - EVAP System P0455 - 009 - Large Leak Detected Freeze Frame: Fault Status: 00010100 Fault Priority: 5 Fault Frequency: 1 Reset counter: 40 Mileage: 251878 km Time Indication: 0 Date: 2017.02.06 Time: 11:43:54 Freeze Frame: Lambda: -1.0 % Temperature: 31.5°C Temperature: 81.0°C Speed: 16.0 km/h Time: 563.2 s Temperature: 592.0°C 001072 - Catalyst System; Bank 2 P0430 - 006 - Efficiency Below Threshold Freeze Frame: Fault Status: 00010001 Fault Priority: 5 Fault Frequency: 1 Reset counter: 40 Mileage: 251898 km Time Indication: 0 Date: 2017.02.06 Time: 13:51:16 Freeze Frame: RPM: 2304 /min Mass Air / Rev.: 305.2 mg/str Temperature: 82.5°C Part Throttle Temperature: 752.0°C Speed: 113.0 km/h Readiness: 0000 0101

I've been sitting in traffic 2-3 hours playing music full blast (bosè system) and charging my iPhone. Is that enough to mess up the battery. The car died in traffic on 3rd attempt started back up. FYI new powerful heavy duty battery fitted 3-4 months ago. But I noticed today for first time with this car 3-5 times while not moving in traffic the rev dial will drop suddenly towards 0 then shoot back to 1 and settle what could that mean? (P.s same day car went dead in traffic I think due to playing music full blast for 2-3 hours in traffic) my mate suggesting alternator dying?