Tire pressure warning light - 2008 Audi A4 Quattro
#1
07-16-2009, 07:51 PM
Tire pressure warning light - 2008 Audi A4 Quattro
I posted this in the B5 forum and was advised to post here as well.
This is a brand new car. Bought it last Saturday. Before we headed home, the Tire Pressure warning light came on. The salesman took it to the shop “to re-set”.
Later that evening the light came on again, when we started driving. The pressure was 38psi in all 4 tires, on the dot. I then learned how to store tire pressure in memory as a baseline, and the light went off.
And then it came on again and I was told to check the spare. It was low, I brought it up to 38-40psi, re-stored the new baseline pressure in memory.
The light is back on. I will stop by at the dealer’s tomorrow morning. I will appreciate it if someone gives me a crush course (or points to a web site if there is one) on the technical side of the problem. Logically, it’s either a faulty sensor or a “controller”, if there is one, or both. I also assume that a dealer’s service techs must have enough equipment and brain power to properly diagnose a problem at once. May be I am wrong on all points but I have to be prepared by 7am tomorrow.
P.S. Before posting this message, I found a year-old thread on the same subject, which brought more questions. The main one: Do they really make sensors which do not allow even a 10% deviation from the “nominal” pressure?
TIA,
Boris
This is a brand new car. Bought it last Saturday. Before we headed home, the Tire Pressure warning light came on. The salesman took it to the shop “to re-set”.
Later that evening the light came on again, when we started driving. The pressure was 38psi in all 4 tires, on the dot. I then learned how to store tire pressure in memory as a baseline, and the light went off.
And then it came on again and I was told to check the spare. It was low, I brought it up to 38-40psi, re-stored the new baseline pressure in memory.
The light is back on. I will stop by at the dealer’s tomorrow morning. I will appreciate it if someone gives me a crush course (or points to a web site if there is one) on the technical side of the problem. Logically, it’s either a faulty sensor or a “controller”, if there is one, or both. I also assume that a dealer’s service techs must have enough equipment and brain power to properly diagnose a problem at once. May be I am wrong on all points but I have to be prepared by 7am tomorrow.
P.S. Before posting this message, I found a year-old thread on the same subject, which brought more questions. The main one: Do they really make sensors which do not allow even a 10% deviation from the “nominal” pressure?
TIA,
Boris
#2
07-17-2009, 07:50 PM
faulty sensor or a “controller” is what i would think as well
and i am pretty sure the system does not read the 5th sensor on the spare.
38-40 psi seems a bit too much. i would get it down to 36 max when COLD (in the morning before you drive)......unless u have 18'' wheels, then i dont know the correct pressure.
and i am pretty sure the system does not read the 5th sensor on the spare.
38-40 psi seems a bit too much. i would get it down to 36 max when COLD (in the morning before you drive)......unless u have 18'' wheels, then i dont know the correct pressure.
#3
07-18-2009, 10:32 AM
Thank you, Kolyan. This was a nasty problem to fix, took the dealer all day, but my wife is happy. Here is the summary from the ticket:
“Tech found Fr Left sensor malfunctioning intermittently. Tech used TPMS diagnostic tool and found all sensors working 12 times. Tech found once 1 sensor failed after test drive. Tech has swapped TPMS modules with known good one. Tech swapped each wheel with spare and test drove to isolate faulty component.”
Hopefully, it will help someone else.
“Tech found Fr Left sensor malfunctioning intermittently. Tech used TPMS diagnostic tool and found all sensors working 12 times. Tech found once 1 sensor failed after test drive. Tech has swapped TPMS modules with known good one. Tech swapped each wheel with spare and test drove to isolate faulty component.”
Hopefully, it will help someone else.
Thread
Thread Starter
Forum
Replies
Last Post
