How JustAnswer Works:
  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site.
    Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.
Ask OnlineMechanic Your Own Question
OnlineMechanic, Mechanic
Category: Audi
Satisfied Customers: 3423
Experience:  3 years Autozone Manager, 10 years Mechanic
Type Your Audi Question Here...
OnlineMechanic is online now
A new question is answered every 9 seconds

2006 audi a4: check engine light..the P R D N..dash display

This answer was rated:

I own a 2006 audi a4. The check engine light has been turning on and off for about a week. When on, the "P" "R" "D" "N" are also ALL lit one the dash display, even while car is in Drive and in motion. Out of nowhere, the lights will go off, only to reappear on the next trip. Any ideas?

Hello and thank you for choosing Just Answer.


The check engine light indicates that the car's computer has found a fault and stored it in the system. The fact that the P R D N are lit, indicates that the fact has to do with a transmission fault. You need to have an OBDII scan done on the car to find out what is triggering that light and what the car has stored.

You can get this scan done for free at any parts store. Simply ask for an OBDII scan and print out.



Customer: replied 6 years ago.
Thank you for responding. If I go get this diagnostic scan done, what if the light is off at the time (since it's sometimes on, sometimes off). Will the scan still tell me what the problems is? or do I need to get the scan done only when the check engine light is on?
You should have the scan done when the light is on, even tough it should be saved in the memory. You will be better off doing the scan with the light on.
Customer: replied 6 years ago.

okay, the scan tells me output speed sensor. Can you tell me anything about the fix?

Thats what I figure it to be. That is the speed sensor which tells the car how fast the wheels are turning. It is mounted on the transmission, and when it goes out it make it seem like not all wheel are turning at the same rate. Which is why the check engine light comes on and the PDRN turns off/on
OnlineMechanic and other Audi Specialists are ready to help you

Related Audi Questions