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Ive just had a mechanic replace my back sensor for my abs...but my car is still shuddering and occasionally stops functioning properly...especially when I'm stopped at a light or in a drive through. Also, it has a kickback, like it revs itself up and then it Jutes forward. I hope this makes sense because before I pay anymore money, I want to know what's wrong with my car.
Country: United StatesMake: AudiModel: A4Year: 1999Engine: 1.8t Already Tried: The abs sensor and back chip were replaced, the suspension was replaced, and now the airbag light is on.
Hello, So that I may best assist you I need to clear up a few questions that I have. What is "back sensor" and why was it replaced? What exactly do you mean by "shuddering" and "stops functioning properly"? What is a "back chip" and was the air bag light on as soon as you got the vehicle back?
As to "it has a kickback, like it revs itself up and then it Jutes forward".If I understand you, these symptoms are consistent with a throttle that requires adaptation. This vehicle is equipped with an electronic idle control system. Any time the battery power is disrupted and reconnected the throttle should be adapted. I recommend you try adapting the throttle. If you have access to a VW/Audi capable scanner go into 01-Engine electronics, retrieve, record and erase any fault codes, go into 04 - basic settings, display field #60. The throttle adaptation should take place, after which you should get a "pass" or "fail" value. You may also be able to adapt the throttle without a scanner on this year model. To do so, first I suggest you do a capacitance discharge. If you remove the battery terminals from the battery and connect or jump them together, turn on the key to the "on" position for about 1 minuet, turn off the key, then reconnect the terminals to the battery. Now turn the key to the on position, but do not start or touch the gas pedal. The throttle should do it's adaptations in the first 10 seconds or so. You should be able to hear and see the throttle do this. Start the vehicle and it should be adapted. The main disadvantage to this method is you will NOT get a "pass" or "fail" value to confirm the adaptation.
Ok, it looks like you have "stepped out" I will be available via email notification. to further assist you and get this sorted out for you. Thank You! Jake
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If I adapt the throttle will it mess with any of my other functions? How would I find the battery?
And the back chip I was referring to is the chip that deals with the rear sensor. I don't want to mess up the car because as you know audis are finicky but still amazing once properly working. The handle on my car, even though it's an older model is phenomenal!
Performing the Capacitance Discharge and adapting the throttle will not "mess with" any of the other functions if done properly. You will however loose your radio presets, and the radio may go into "SAFE" mode which may require you to enter the radio code that should be in your radio manual. If you do not have the correct code for the radio, you will have to contact an Audi dealer to get you the code. They will likely charge you for this. But if you have disconnected the battery before and a code was not necessary it will likely be ok this time, but no guarantees.Also you will have to reset your window's "one touch" feature. Simply, one at a time raise the window up to the stop, release the switch, then hold it in the up position again for about 5 seconds you will hear a click under the driver's seat area and it will be reset. Repeat for other windows.The battery is under the hood in front of the windshield. To perform the capacitance discharge, disconnect both terminals from the battery, then connect them together. If the cables are not long enough to reach connect them with something metal like a screwdriver. JUST MAKE SURE THE TERMINALS ARE NOT ON THE BATTERY.I'd like to ask you again; What is "back sensor"? Is it one of the rear ABS Wheel Speed Sensors? And why was it replaced? What exactly do you mean by "shuddering" and "stops functioning properly"? So as for the "chip" that would be the ABS Control Module???Was the air bag light on as soon as you got the vehicle back?And lastly Why could your "mechanic" not be able to address these issues? If they occurred as a result of him working on it, he should rectify it.Jake
It seems that very time I took my car to this person it was something else wrong with the car. Luckily I've stumbled on this wonderful website and I'm thankful for all advice given. My car is used but it pretty good condition. I will apply you suggestion of resetting the throttle and hopefully that'll work...of not, I'm taking it elswhere. Will any Audi dealership service me, even if my car is used? Should I go to a different specialist? Thank you sooooooo much!
Yes, any Audi dealership will service your vehicle. You could also take it to a Audi specialty shop if there is one in your area. I suggest you ask other local Audi owners where they bring their vehicles for service and request they share their experiences.Positive feedback, referrals and bonuses are always APPRECIATED! If you accept MY answer please click on the “ACCEPT” button by THIS answer.Thank You!Jake "The Audi Doctor"
Experience: Over 30 years experience, 17 years with Audi, Factory trained