Has anyone ever had this issue my abs light came on together with the brake light and a few more lights plus my steering wheel is stiff my speedometer is not telling the speed I'm going and my backup camera is not working along with the sensors around the vehicle and it's making my rpm go above 1000 when stoped I need help I changed the speed sensors all four still have the same problem

 

Basic car info is required when asking for assistance; the year, mileage, engine, and pertinent details surrounding your ownership of this vehicle.

It's nearly impossible to diagnose/troubleshoot a Q7s electronics systems w/o using a VAGCOM type of scan tool. Throwing parts at this car rarely succeeds. The VW coding system used means it has to be a VAG compatible scan tool or you won't be able to see all the fault codes stored by the car inside control modules (many computers on this car).

That'd be the very first thing I'd do...perform a full diagnostic scan of the car to see what it'll tell you. More often than not it'll point you directly at the failed sensor or underlying issue. Sometimes you'll see fault codes that are related to the underlying issue, but not the actual issue, etc.

FWIW: A lot of problems on these cars are caused by water leaks/clogged water drains, and spills damaging electronics...circuit boards/control modules/amplifiers, ECU, etc.

Don't know enough about your car or current fault codes to venture a guess at this point. OBD-eleven is an inexpensive code reader, but if you want to repair this car and save money doing it, then get the Ross-Tech VCDS scan tool...affordable, and it will save you $$$ and time.

 

Hi there,
I am having the same issues as you are describing on my Audi A6 C6 Allroad. Did you manage to find a solution, and make the system work again?
I would be very happy if you could share info with me if your car is now back in good shape.

Best regards,

Arnstein Hammerseth
Norway
arnstein.hammerseth@gmail.com

 

Hi there!
Noticed you posted in your dedicated model forum related to loss of your right headlamp (changing the bulb/ballast didn't help, etc.), and for that particular issue it normally turns out to be related to wiring damage upstream of the headlamp, from furry little rodents desiring to make a cozy, warm nest out of your wiring insulation. Definitely look closely for rodent poop pellets, dried/crystallized urine drops/tracks over top of surfaces in engine bay, etc. Check all the corners and beneath the plenum cover (based on your symptoms set, that's likely where there is damage to wiring).

Or, since your car has sooo many mechanical and electrical symptoms all at once, better verify that the ECU has no damaged wires/hookups, etc.

Realistically, while you can and should look around your engine bay for the rodent damage/wiring damage signs first, to own an older Audi like this you do need a VAGCOM capable scan tool to be able to see what the car can tell you about what is wrong with it.

Cost is very low for a basic, VAGCOM capable scan tool like OBD-eleven, Carista, etc. As noted prior, for any significant DIY repairs (especially electrical/control modules related) or long-term 'keeper' cars you plan to drive into the ground, just get the Ross-Tech VCDS, which is going to save you sooo much time and money, and gives you much better diagnosing tools and data to work with, and best of all... you pay one price, one time; there's no paywall games to play or annual fees related for what you can see or do with the VCDS tool.