tjdp01

On two occasions my car will not start. The instrument panel turns on, the wheel unlocks, but the starter doesn't do anything at all. each instance happened when I drove from warmer Santa Monica weather to cooler higher altitude ski area weather, and the problem only happened in the exactly same parking spot where I rent my snowboard. After 25 minutes and many attempts, each time, the car suddenly started again. Once up at the ski hill parking lot an hour further up the road, the engine still restarts after stopping. And at the end of the day the engine starts just fine. Occasionally, if I put the key in and turn it too quickly, it won't start. I have to instead insert the key, wait for the unlock, then turn it and wait for rest of the instrument panel and lights, then start the ignition. So turning the car is a slow three phase process that takes about 3 seconds. I can't rush it in less than one second or it simply won't do anything.

Anyone have any idea what this is? I'm going to take it to the dealership next week, but I generally don't love the dealerships because I find that they throw too many parts at problems, they don't fix only the part that needs to be fixed, and I"m pretty handy so I can usually do a lot of repairs myself. But this one has me stumped.



I used an app called Carista to do a diagnostics, and I did find these codes including one having to do with ignition that goes as follows:
Ignition authorization
Part #: 4F0910852
Coding: 131 (decimal)
Component: FBSAUDIC6 ELV
Fault codes:
01176 Key Faulty
00166 Access/Start Authorization Switch (E415)



Here's the full diagnostic readout from carista. And also, other than the occasional misfires when the engine is cold this car operates quite well. Its not quite the mess that the codes make it look like.

ECU info obtained with Carista 361099 for iOS:

VIN: WA1BY74L48D046539

CAN network gateway
Part #: 4L0910468A
Coding: F5D7FE77701A0200 (hex)
Component: J533__Gateway
[No fault codes]

Battery regulator
Part #: 4L0910181A
Coding: [none]
Component: J0644 BEM
[No fault codes]

Parking sensors
Part #: 4F0910283H
Coding: 221246 (decimal)
Component: Parkhilfe 8-Kan
[No fault codes]

Ignition authorization
Part #: 4F0910852
Coding: 131 (decimal)
Component: FBSAUDIC6 ELV
Fault codes:
01176 Key Faulty
00166 Access/Start Authorization Switch (E415)

Central electronics
Part #: 4F0910279K
Coding: 14123 (decimal)
Component: ILM Fahrer
[No fault codes]

Central electronics 2
Part #: 4F0910280
Coding: 12001 (decimal)
Component: ILM Beifahrer
[No fault codes]

Body/convenience system
Part #: 4L0910289F
Coding: 7632925 (decimal)
Component: Komfortgeraet
[No fault codes]

Body/convenience system
Part #: 4L0910290A
Coding: 3595 (decimal)
Component: ILM HINTEN 2
[No fault codes]

Tire pressure monitor
Part #: 4F0910273B
Coding: 62424 (decimal)
Component: Reifendruck 3
Fault codes:
01521 Sensor for Tire Pressure

Heater & air conditioning
Part #: 4L0910043B
Coding: 524326 (decimal)
Component: KLIMABETAETIGUNG
[No fault codes]

Steering wheel
Part #: 4F0910549A
Coding: 2042 (decimal)
Component: J0527
[No fault codes]

Driver's seat
Part #: 4F0910760
Coding: 82946 (decimal)
Component: Sitzmemory FS
Fault codes:
01446 Givers for backrest adjustment, driver's seat (G230)

Driver's door
Part #: 4L0910793B
Coding: 35531 (decimal)
Component: TSG FA
[No fault codes]

Front passenger's door
Part #: 4L0910793B
Coding: 35531 (decimal)
Component: TSG BF
[No fault codes]

Rear left door
Part #: 4L0910795B
Coding: 35338 (decimal)
Component: TSG HL
[No fault codes]

Rear right door
Part #: 4L0910795B
Coding: 35338 (decimal)
Component: TSG HR
[No fault codes]

Trunk
Part #: 4L0910945
Coding: [none]
Component: ValeoHeckdeckel
Fault codes:
01336 Data Bus for Comfort System

Back-up camera
Part #: 4L0910441A
Coding: 1020101 (decimal)
Component: J772__Rearview
[No fault codes]

Instrument cluster
Part #: 4F0910900C
Coding: 3665288 (decimal)
Component: KOMBIINSTR. M73
[No fault codes]

Airbags
Part #: 4L0910655A
Coding: 14131 (decimal)
Component: 73 AIRBAG AUDI8R
[No fault codes]

ABS
Part #: 4L0910517B
Coding: 99345 (decimal)
Component: ESP ALLR
[No fault codes]

Transmission
Part #: 4L0910156B
Coding: 2 (decimal)
Component: AG6 0AT 3,6 FSI
[No fault codes]

Back-up camera
[ECU not present]

Headlight aiming
Part #: 4L0910357
Coding: 21 (decimal)
Component: AFS 1
[No fault codes]

Engine
Part #: 03H906032CA
Coding: 1175 (decimal)
Component: Q7 3.6-FSI-LEV2
Fault codes:
P0300 Random/Multiple Cylinder Misfire Detected
P0303 Cylinder 3, Misfire Detected
P0306 Cylinder 6, Misfire Detected
P0302 Cylinder 2, Misfire Detected
P0304 Cylinder 4, Misfire Detected
P3078 Throttle Control: Airflow at idle too low

Adaptive cruise control
[ECU not present]

Lane-maintain system
[ECU not present]

Lane-change system
[ECU not present]

Infotainment display
Part #: 4L0910731P
Coding: 2003 (decimal)
Component: Interfacebox
[No fault codes]

Media player
Part #: 4L0910110A
Coding: [none]
Component: MP3-Changer
[No fault codes]

Media player
Part #: 4E0035785B
Coding: [none]
Component: SG ext.Player
[No fault codes]

Radio
Part #: 4E0910541Q
Coding: 2 (decimal)
Component: TUNER EU/US/RDW
[No fault codes]

Digital radio
Part #: 4E0910593K
Coding: 100 (decimal)
Component: SDAR SIRIUS
Fault codes:
02635 Tuner not enabled / activated

Telephone
Part #: 4F0910336E
Coding: 10900 (decimal)
Component: Handyvorb2
[No fault codes]

Sound system
Part #: 4L0910223G
Coding: 16 (decimal)
Component: DSP-High AU716
Fault codes:
02247 Subwoofer (R148)

Engine (3)
[ECU not present]

lentiman

tjdp01

landragon

Engine misfires indicates something wrong with getting the right fuel mixture to start the engine (or keep it running). Engine misfires also tend to occur in cold weather

J. Patterson